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1.
Thermal properties of poly(siloxane)–poly(tetrafluoroethylene) (SIL–PTFE) system were investigated, using Perkin Elmer DSC-7
differential scanning calorimeter and TGA-7 thermogravimetric analyzer. For SIL–PTFE compositions, one glass transition temperature
T
g has been found, in accordance with the reciprocal rule up to about 40 mass% of PTFE. However, for higher PTFE contents, T
g values about –118 to –112°C were observed that can be ascribed to motions of cross-linked SIL structures. Endo- and exothermic
transitions, found in the range from 70 to 290°C, not observed for pure SIL and PTFE components, are considered as specific
ones for the SIL–PTFE semi-IPN structures.
The SIL–PTFE system, as well as its components, is thermally stable, if degradation reactions are considered; the temperatures
of decomposition at the maximum decomposition rate were above 530°C. It has been found that the thermal stability of the SIL–PTFE
system is increasing with the increase of the PTFE content.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
2.
YOSHINORI TAKASHIMA KAZUYA SAKAMOTO YOSHIFUMI OIZUMI HIROYASU YAMAGUCHI SHIGEHIRO KAMITORI AKIRA HARADA 《Journal of inclusion phenomena and macrocyclic chemistry》2006,56(1-2):45-53
Cyclodextrins (α-CD, β-CD and 2,6-di-O-dimethyl-β-CD (DM-β-CD)) were found to form inclusion compounds with thiophenes (thiophene (T), bithiophene (2T)) in water and in crystalline states. The structures of α-CD–T, β-CD–2T, and DM-β-CD–2T inclusion complexes were determined by X-ray crystallography. DM-β-CD forms a 1:1 cage type complex with 2T. In contrast, β-CD formed 2:3 (CD:guest) complexes with thiophene and α-CD formed 2:3 complexes, both of the channel type. These inclusion complexes were found to polymerize by FeCl3 in the inclusion compounds in water. The products were formed poly-pseudo-rotaxane between cyclodextrins and poly(thiophene) characterized by IR, 1H-NMR and 13C CP/MAS NMR. The molecular weights of the poly-pseudo-rotaxanes with poly(thiophene) were determined by the MALDI-TOF mass spectra to be 3000–5000. In comparison between poly-pseudo-rotaxane (DM-β-CD–poly(thiophene)), authentic poly(thiophene) and the washed DM-β-CD–poly(thiophene) which was washed with DMF to dethread DM-β-CD, these poly-pseudo-rotaxane was characterized by Raman, UV–vis and fluorescence spectra. The maximum emission band of DM-β-CD–poly(thiophene) shifted to a shorter wavelength. The hypsochromic shift was derived from poly-pseudo-rotaxane with DM-β-CD. 相似文献
3.
Lemonia Valianou Konstantina Stathopoulou Ioannis Karapanagiotis Prokopios Magiatis Eleni Pavlidou Alexios-Leandros Skaltsounis Yannis Chryssoulakis 《Analytical and bioanalytical chemistry》2009,394(3):871-882
Young fustic (Cotinus coggygria Scop.; Anacardiaceae) has been used as a dyestuff since antiquity. Phytochemical investigation of the methanol extract of
the heartwood has led to the isolation and structure elucidation by nuclear magnetic resonance and mass spectrometry (MS)
of 3′,4′,6-trihydroxyaurone (sulfuretin) and 3′,4′,7-trihydroxyflavonol (fisetin) as well as 3′,4′,7-trihydroxyflavanol (fustin),
3′,4′,5,7-tetrahydroxyflavonol (quercetin), 3′,4′,5,7-tetrahydroxyflavanol (taxifolin), 4′,7-dihydroxyflavanol, 3′,4′,7-trihydroxyflavanone
(butin), 4′,7-dihydroxyflavanone (liquiritigenin), trans-2′,3,4,4′-tetrahydroxychalcone (butein), 4′,5,7-trihydroxyflavanone and trans-2′,4,4′-trihydroxychalcone (isoliquiritigenin). The isolated compounds were used as reference materials for the development
of a high-performance liquid chromatography–diode array detector–MS method, which was then applied to analyse (1) fresh silk
samples dyed with young fustic, (2) dyed silk subjected to artificially accelerated light ageing and (3) historical silk micro-samples,
extracted from ecclesiastical post-Byzantine garments (fifteenth to eighteenth century), which belong to monasteries of Mount
Athos. Sulfuretin and fisetin, which are usually used as markers for the identification of the yellow dye and, for the first
time, some of the aforementioned flavonoid components of young fustic were identified in the historical extracts. Furthermore,
preliminary experiments suggested that although the amounts of the dye components decrease with light ageing, the relative
ratio of fisetin and sulfuretin, after a first step of ageing, seems to be almost unaffected by such degradation processes
raised by light. The effect of the latter on the morphology of the dyed silk fibres is briefly investigated by scanning electron
microscopy. 相似文献
4.
Poly(amino-amide; PAA) particles consisting of p-phthalyl chloride and 3,3′-diaminobenzidine and 4,4′-diphenyldicarbony chloride and 3,3′-diaminobenzidine were prepared.
The particles were then transformed by treatment with heat into poly(p-phenylenebenzimidazole; PPC–PAA) and poly(4,4′-diphenylenebenzimidazole; DPC–PAA) particles, respectively. The number ratio
of ring-closing of the obtained product was found to be dependent on the processing temperature. However, the morphology and
diameter of the products were not found to be temperature dependent. PPC–PAA particles were amorphous and DPC–PAA particles
had a high degree of crystallinity. Further, upon heating up to 1,000 °C, poly(p-phenylenebenzimidazole) and poly(4,4′-diphenylenebenzimidazole) particles were transformed into carbon particles and carbon
bulk, respectively. The poly(amino-amide), polybenzimidazole and carbon particles obtained were nano-sized spherical particles
with narrow size distributions. 相似文献
5.
Proietti N Presciutti F Di Tullio V Doherty B Marinelli AM Provinciali B Macchioni N Capitani D Miliani C 《Analytical and bioanalytical chemistry》2011,399(9):3117-3131
A multi-technique approach was employed to study a decorated Egyptian wooden sarcophagus (XXV–XXVI dynasty, Third Intermediate
Period), belonging to the Museo del Vicino Oriente of the Sapienza University of Rome. Portable non-invasive unilateral NMR
was applied to evaluate the conservation state of the sarcophagus. Moreover, using unilateral NMR, a non-invasive analytical
protocol was established to detect the presence of organic substances on the surface and/or embedded in the wooden matrix.
This protocol allowed for an educated sampling campaign aimed at further investigating the state of degradation of the wood
and the presence of organic substances by 13C cross polarization magic angle spinning (CPMAS) NMR spectroscopy. The composition of the painted layer was analysed by optical
microscopy (OM), scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS), Raman and surface enhanced (resonance)
Raman spectroscopy (SERS/SERRS), infrared and GC–MS techniques, evidencing original components such as clay minerals, Egyptian
green, indigo, natural gums, and also highlighting restoration pigments and alteration compounds. The identification of the
wood, of great value for the reconstruction of the history of the artwork, was achieved by means of optical microscopy. 相似文献
6.
7.
A new dicarboxylic acid monomer containing the N-methylcarbazole and imide structures, 3,6-bis(trimellitimido)-N-methylcarbazole (I), was prepared from the condensation of 3,6-diamino-N-methylcarbazole (c) and trimellitic anhydride. The diamine c was synthesized in three steps starting from the methylation of carbazole, followed by nitration and catalytic hydrazine
reduction. A series of N-methylcarbazole-containing poly(amide–imide)s were synthesized by direct polycondensation from the diimide–diacid I with various aromatic diamines. These poly(amide–imide)s had inherent viscosities of 0.66–1.47 dl/g and were readily soluble
in a variety of organic solvents, including N-methyl-2-pyrrolidone and N,N-dimethylacetamide (DMAc). Transparent, flexible, and tough films of these polymers could be cast from DMAc solutions, and
these films exhibited excellent mechanical strength. The glass-transition temperatures of these poly(amide–imide)s were in
the range 317–362 °C. All the poly (amide–imide) did not degrade noticeably below 480 °C in nitrogen, and the 10% weight loss
temperatures and char yields at 800 °C were above 520 °C and 60% in nitrogen, respectively, indicating high thermal stability.
Received: 8 February 2000/Accepted: 23 March 2000 相似文献
8.
Maurizio Avella Roberto Avolio Irene Bonadies Cosimo Carfagna Maria Emanuela Errico Gennaro Gentile 《Journal of Thermal Analysis and Calorimetry》2010,102(3):975-982
Dynamic thermogravimetric analysis under nitrogen flow was used to investigate the thermal decomposition process of high-density
poly(ethylene) (HDPE)-based composites reinforced with cellulose fibers obtained from the recycling of multilayer carton scraps,
as a function of the cellulose content and the compatibilization. The Friedman, Flynn–Wall–Ozawa, and Coats–Redfern methods
were used to determine the apparent activation energy (E
a) of the thermal degradation of the cellulose component into the composites. E
a has been found dependent on the cellulose amount and on the cellulose/polymer matrix interfacial adhesion. In particular,
it has been evidenced an increase of the cellulose thermal stability as a consequence of the improved interfacial adhesion
between the components in NFR composites. 相似文献
9.
The lightfastness declarations of several different commercial acrylic paints and different quality series were tested by
artificial UV ageing. To evaluate their lightfastness declarations, three acrylic colours (cadmium red, ultramarine blue and
chromium oxide green) from six companies (Lascaux, Liquitex, Lukas, Rembrandt, Schmincke, and Winsor & Newton) were analysed
before and after UV exposure. Characterisation and identification of these materials were carried out with Py–GC/MS, FTIR–ATR
analyses, and colour measurements. Particular attention was focused on the Py–GC/MS measurements and on comparison of the
single-shot method for pyrolysis of polymers and the double-shot mode which enables a unique combination of pyrolysis methods
for analysis of polymers and thermal desorption for documentation of the volatile compounds. Depending on the particular company
and the specific value of the lightfastness declaration, different binding media (i.e. poly(EA/MMA), poly(nBA/MMA), and poly(2-EHA/MMA)), and fillers (i.e. kaolinite, calcium carbonate, barite, and talc) were characterised and identified
by Py–GC/MS and FTIR–ATR analyses. After UV exposure, several alteration processes with consequent formation of volatile compounds
or new products were observed by both techniques, especially for the blue paints. In particular, the double-shot mode of Py–GC/MS
enabled the detection of oxidation products, which could not be detected with the single-shot mode. Comparison of the lightfastness
declarations for each of the blue, green, and red paints and the noted alterations broadly agreed for most of the paints. 相似文献
10.
Summary. A new type of silica precursor was synthesized by (trans)alkoxylation of alkoxy- and chlorosilanes with ethyl (L)-lactate. This novel ethyl lactate modified silane was hydrolyzed and condensed in the presence of a non-ionic surfactant
– poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) triblock copolymer (P123) – to give monolithic silica gels.
The wet gels were dried using two different drying techniques resulting in crack-free monoliths: a) supercritical drying with
CO2 to yield a porous inorganic material and b) surface silylation with trimethylchlorosilane to yield an inorganic–organic nanocomposite
material. The obtained porous gels were characterized by different techniques including thermal analysis, nitrogen sorption,
and electron microscopy (TEM, SEM). 相似文献
11.
Mantzouris D Karapanagiotis I Valianou L Panayiotou C 《Analytical and bioanalytical chemistry》2011,399(9):3065-3079
Organic colorants contained in 30 textiles (16th to early 20th century) from the monastery of Simonos Petra (Mount Athos)
have been investigated using high-performance liquid chromatography equipped with diode-array detection and mass spectrometry
(HPLC–DAD–MS). The components of natural dyes identified in samples treated by the standard HCl dyestuff extraction method
were: alizarin, apigenin, butein, carminic acid, chrysoeriol, dcII, dcIV, dcVII, ellagic acid, emodin, fisetin, flavokermesic
acid, fustin, genistein, haematein derivative (Hae′), indigotin, indirubin, isoliquiritigenin, isorhamnetin, kaempferide,
kaempferol, kermesic acid, luteolin, naringenin, purpurin, quercetin, rhamnazin, rhamnetin, sulfuretin, and type B and type
C compounds (last two are markers for Caesalpinia trees). Early, semi-synthetic dyes, for example indigo carmine, fuchsin components, and rhodamine B were identified in objects
dated late 19th to early 20th century. A dyestuff extraction method which involves use of TFA, instead of HCl, was applied
to selected historical samples, showing that the mild method enables efficient extraction of weld (Reseda luteola L.) and dyer’s broom (Genista tinctoria L.) glycosides. The marker compound (Hae′) for logwood (Haematoxylum campechianum L.) identification after treatment with HCl was investigated by liquid chromatography coupled to mass spectrometry (LC–MS)
in negative electrospray ionization (LC–MS-ESI−) mode. LC–MS in negative atmospheric pressure chemical ionization (LC–MS-APCI−) mode was used, probably for the first time, to investigate cochineal (Dactylopius coccus Costa) samples. Positive electrospray ionization (LC–MS-ESI+) mode was used for identification of fuchsin components. Detailed HPLC–DAD studies were performed on young fustic (Cotinus coggygria Scop.) and Persian berries (Rhamnus trees). 相似文献
12.
The generation of dendrimers based on poly(propylene imine) with CN end groups [DAB–dend–(CN)
x
] and with palmitoyl end groups [DAB–dend–(C15)
x
] was studied by methods of translational diffusion and viscometry. The volumes of the DAB–dend–(CN)
x
and DAB–dend–(C15)
x
dendrimers and the previously studied DAB–dend–(lacto)
x
dendrimer were compared to evaluate the volumes of the end groups in hybrid dendrimers. The volume of the hybrid dendrimers
compared to that of the initial dendrimers increases proportionally to the number of end groups: this means that the end groups
are predominantly located on the periphery of each molecule, thus ensuring this volume will increase. It is shown that the
volume of the end groups for DAB–dend–(C15)
x
is 3.5 times greater, and for DAB–dend–(lacto)
x
it is 5.0 times greater than that occupied by free mole- cules corresponding to the end groups. The values of the intrinsic
viscosity were compared with the values of the diffusion coefficient and the chemical formula molecular weight.
Received: 7 August 2001 Accepted: 2 November 2001 相似文献
13.
Ivan A. Novakov Philipp S. Radchenko Aleksandr S. Ozerin Elena V. Rybakova Stanislav S. Radchenko 《Colloid and polymer science》2011,289(11):1197-1203
Formation of polymer–colloid complexes formed by positively charged aluminoxane particles with a size of ~4.6 nm, which constitute
the main part of the dispersed phase in aluminum polyhydroxychloride sols with poly(acrylic acid) and acrylic acid copolymers
with acrylamide, is studied. Conditions of preparing water-soluble polymer–colloid complexes are determined. It is shown that
water-soluble polycomplexes are obtained through the interaction of aluminoxane particles with acrylic acid–acrylamide copolymers
containing no more than 0.8 mol% acrylic acid units. In the polymer–colloid complex, aluminoxane particles are uniformly distributed
over polyelectrolyte macromolecules and the optimum composition is attained at the molar ratio of components Z equal to 1:1. In semidilute solutions, the addition of aluminoxane particles to the copolymer brings about formation of the
gel featuring viscoelastic properties. For all copolymers, the maximally elastic properties of the gels are attained at Z ≈ 1. 相似文献
14.
The poly(o-anisidine)–sulfuric acid–glucose oxidase (POA–H2SO4–GOx) electrode has been investigated in the present work. Platinum electrode was used for the synthesis of poly (o-anisidine)–sulfuric acid (POA–H2SO4) film using galvanostatic method with 0.2 M o-anisidine, 1.0 M H2SO4 solution, 1.0 pH and 2 mA/cm2 applied current density. The synthesized film was characterized using electrochemical technique, conductivity measurement,
UV–visible spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. GOX was immobilized on synthesized POA–H2SO4 film by cross-linking via glutaraldehyde in phosphate and acetate buffer. The Michaelis–Menten constant (
K\textm¢K_{\text{m}}^\prime ) was determined for the immobilized enzyme. The glucose oxidase electrode shows the maximum current response at pH 5.5 and
potential 0.6 V. The sensitivity of POA–H2SO4–GOX electrode in phosphate and acetate buffer has been recorded. The results of this study reveal that the phosphate buffer gives
fast response as compared to acetate buffer in amperometric measurements. 相似文献
15.
Li-Ting Lee Eamor M. Woo Wei-Ting Chen Ling Chang Kai-Cheng Yen 《Colloid and polymer science》2010,288(4):439-448
Miscibility with a linear T
g–composition relationship was proven for blend of poly(butylene adipate-co-butylene terephthalate) [P(BA-co-BT)] with poly(4-vinyl
phenol) (PVPh). In comparison to the blends of PBA/PVPh and poly(butylene terephthalate) (PBT)/PVPh, the Kwei’s T
g model fitting on data for the P(BA-co-BT)/PVPh blend yields a q value between those for the PBA/PVPh and PBT/PVPh blends. The q values suggest that the interaction strength in the P(BA-co-BT)/PVPh blend is not as strong as that in the PBT/PVPh blend.
Upon mixing the PVPh into the immiscible blend of PBA and PBT, the ternary PBA/PBT/PVPh blends only exhibits partial miscibility.
Full-scale ternary miscibility in whole compositions is not possible owing to the significant ∆χ effect (χ
ij
– χ
ik
). The wavenumber shifts of the hydroxyl IR absorbance band indicates that the H-bonding strength is in decreasing order—PBT/PVPh
> P(BA-co-BT)/PVPh > PBA/PVPh—and shows that the BA segment in the copolymer tends to defray interactions between P(BA-co-BT)
and PVPh in blends. 相似文献
16.
HanWen Sun LianYing Zhang XinJun Zhu ChunYan Kong CunLan Zhang SiDe Yao 《中国科学B辑(英文版)》2009,52(1):69-75
One-pot synthesis of magnetic nanogels with excellent biocompatibility via the photochemical method is reported in this paper.
Poly(PEGMA) modified superparamagnetic nanogels (poly(PEGMA) magnetic nanogels) were synthesized by in-situ polymerization using poly(ethylene glycol) methacrylate (PEGMA) as the monomer and N, N′-methylene-bis-(acrylamide) (MBA) as the cross-linking agent in magnetite aqueous suspension under UV irradiation. The surface
functional groups and components of magnetic nanogels were analyzed by Fourier transform infrared spectroscopy (FTIR) and
a thermogravimetric analyzer (TGA). The results indicated that the poly(PEGMA) magnetic nanogels were synthesized successfully
by coating poly(PEGMA) on the Fe3O4 nanoparticles under UV irradiation, and the Fe3O4 nanoparticles content in this nanogels was above 50 wt%. The morphology, size, zeta-potential and magnetic property were
also characterized. The magnetic nanogels had a nearly spherical shape and core-shell structure, the average size in aqueous
system measured by photon correlation spectroscopy (PCS) was 68.4 nm, which was much bigger than that in the dry state, the
nanogels behaved superparamagnetically with saturated magnetization of 58.6 emu/g, and the zeta-potential was −16.3–−17.3
mV at physiological pH (6.8–7.4) which could help to maintain stability in blood. The preliminary application as drug carrier
was made and the doxorubicin-loaded magnetic nanogels had an excellent property in slow-release. The experiment indicated
that the magnetic nanogel was an ideal candidate carrier in target drug delivery systems and other biomedical application.
Supported by the Natural Science Foundation of Shandong Province (Grant No. Q2006F01), Scientific and Technological Project
of Shandong Province (Grant No. 2007GG3WZ02066) and Scientific and Technological Project of Department of Education, Shandong
(Grant No. J07WC01) 相似文献
17.
Conducting polypyrrole (PPy) and poly(pyrrole-2,6-dimethyl-β-cyclodextrin) [poly(Py-β-DMCD)] films were prepared by electrode
potential cycling on a gold electrode in aqueous and nonaqueous (acetonitrile) electrolyte solutions containing lithium perchlorate.
The resulting products were characterized with cyclic voltammetry, in situ UV–Vis spectroscopy, and in situ conductivity measurements.
For the electrosynthesis of poly(Py-β-DMCD), a (1:1) (mole–mole) (Py-β-DMCD) supramolecular cyclodextrin complex of pyrrole
previously characterized with proton NMR spectroscopy was used as starting material. A different cyclic voltammetric behavior
was observed for pyrrole and the poly(Py-β-DMCD) complex in aqueous and nonaqueous solutions during electrosynthesis. The
results show that in both solutions in the presence of cyclodextrin, the oxidation potential of pyrrole monomers increases.
However, the difference of oxidation potentials for films prepared in aqueous solution is larger than for the films prepared
in nonaqueous solution. In situ conductivity measurements of the films show that films prepared in acetonitrile solution are
more conductive than those synthesized in aqueous solutions. Maximum conductivity can be observed for PPy and poly(Py-β-DMCD)
films prepared in nonaqueous solution in the range of 0.10 < E
Ag/AgCl < 0.90 V and 0.30 < E
Ag/AgCl < 0.90 V, respectively. In situ UV–Vis spectroelectrochemical data for both films prepared potentiodynamically by cycling
the potentials from −0.40 < E
Ag/AgCl < 0.90 V in nonaqueous solutions are reported.
This paper is dedicated to Prof. Alan Bond on the occasion of his 65th birthday in recognition of his numerous contributions
toward electrochemistry. 相似文献
18.
A. F. Fucaloro C. Edmunds S. Grant W. Kim B. Lee J. Mao G. Pera K. Pinnock 《Journal of solution chemistry》2011,40(7):1349-1360
The partial molar volumes (V
2) and refractions (R
2) for poly[vinyl alcohol] (PVOH) in water were determined at 0.00, 5.00, 15.00, 20.00, and 25.00 °C. Each of the partial molar
quantities exhibits a small but significant dependence upon concentration which is analyzed using a previously reported model
of solvation. This study concludes that the water in the regions surrounding the solute molecules exhibits less hydrogen bonding
and as a consequence is denser than the bulk water. In addition, the study finds that the partial molar volume of PVOH at
infinite dilution is the simple sum of contributions from its monomer units (–CH2–CHOH–). 相似文献
19.
Xiaoju Peng Anna Maria Hofmann Sascha Reuter Holger Frey J?rg Kressler 《Colloid and polymer science》2012,290(7):579-588
Interactions of the phospholipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) with the amphiphilic diblock copolymer Ch-lPEG30-b-hbPG24 (ChP) are studied at the air–water interface by surface pressure–mean molecular area (π–mmA) measurements of mixed Langmuir films and adsorption measurements of ChP to the air–water interface covered with DPPC monolayers
at different initial surface pressure values π
0. ChP is composed of a single hydrophobic cholesteryl (Ch) moiety covalently bound to a diblock copolymer consisting of a
hydrophilic linear poly(ethylene glycol) (lPEG) block and a hydrophilic hyperbranched poly(glycerol) (hbPG) block. Langmuir isotherms and compression moduli of the mixed Langmuir films of different molar ratios reveal distinct
interactions between DPPC and ChP during compression. It is demonstrated that the behavior of the DPPC/ChP mixtures is dominated
by DPPC up to a molar ratio of 10:1, whereas the behavior is predominantly governed by ChP in mixtures with lower DPPC content
(molar ratios of 5:1, 2:1, and 1:1). In adsorption measurements, a strong affinity of ChP to DPPC is observed after injection
into the water subphase. The surface pressure value π
in up to which ChP is able to penetrate into DPPC monolayers is determined to the remarkably high value of 48.2 mN/m which attests
the favorable interactions between DPPC and the Ch moiety of ChP. Atomic force microscopy on LB films of DPPC/ChP mixtures
of different molar ratios transferred onto hydrophilic substrates confirms the presence of two different phases, a DPPC-rich
phase and a ChP-rich phase. 相似文献
20.
An associating terpolymer (PAOE) of acrylamide (AM), sodium 2-acrylamido-2-methylpropane sulphonate (NaAMPS), and a novel
macromonomer: p-vinylbenzyl-terminated octylphenoxy poly(ethylene oxide) (VOE, degree of polymerization: 4) was synthesized by aqueous free-radical
copolymerization. The PAOE polymer exhibited excellent thickening properties in unsalted and brine solutions. The electrostatic
shielding of repulsive interactions of the polymer was much weaker than that of the linear associating polymers with small
hydrophobic monomers. This brine solution exhibited unexpected salt-thickening behaviors twice, and good resistance to salt
and ageing. The intermolecular hydrophobic association in unsalted and brine PAOE solutions, as functions of polymer and NaCl
concentration, were characterized by fluorescence spectroscopy. With the addition of NaCl, the polymer chains were comparatively
extended and continuous network structures were formed via the intermolecular hydrophobic association in brine solutions as
well as in unsalted solutions at 0.15–0.25 g⋅dL−1 PAOE, as observed by a scanning electron microscope (SEM). 相似文献