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1.
Cyclohexyl α-chloroacrylate (CCA) was polymerized by radical anionic and γ-radiation initiation. The anionic polymerization of cyclohexyl α-chloroacrylate gave moderately isotactic polymer in toluene and syndiotactic-rich polymer in THF. Poly(cyclohexyl α-chloroacrylate) (PCCA) was found to undergo two-stage weight loss in thermogravimetric analysis, and the first-stage weight loss was attributed to the lactonization reaction. PCCA degraded under γ-radiation, and the radiation yields of crosslinking and scission, G x and G s, were 0.6 and 3.8, respectively. 相似文献
2.
Huaiping Zhang Kai Xu Hao Ai Dehong Chen Linli Xv Mingcai Chen 《Journal of solution chemistry》2008,37(8):1137-1148
The hydrophobically modified polyelectrolyte was synthesized using precipitation polymerization of acrylic acid and 3-[tris(trimethylsilyloxy)silyl]propyl
methacrylate (TMSPMA) in various molar ratios in supercritical carbon dioxide. FT-IR, 1H NMR, capillary viscometry, rotational viscometer, transmission electron microscopy and fluorescence spectroscopy were used
to characterize this copolymer. The viscosity of the copolymers showed a strong dependence on pH with a maximum at pH=5.5.
Associating morphologies of the copolymer were observed by TEM. Associating morphologies of poly(AA-co-TMSPMA) solution changed
from a global structure to a shell-core structure with increasing hydrophobic levels. A solution of sample PAT4 with a shell-core
structure had the largest viscosity value. In addition, the critical micelle concentration of copolymer solution, cmc, was
determined from the relative viscosity. The critical micelle concentration was further confirmed by fluorescence spectroscopy
using 1-pyrenemethylamine hydrochloride, PyMeA⋅HCl, as a cationic fluorescent probe. The cmc was determined from the intensity
ratios, the first to the third emission peaks I
1/I
3, and the excimer to monomer I
E/I
M ratio of the pyrene probe as a function of concentration. 相似文献
3.
Themetalmacrocycliccomplexeswiththeirunusualoxidationstateshaveattractedmuchinterest.Silver(Il)andsi1ver(IlI)compoundsareusuallyunstab1eduetotheirstrongoxidation.Butsometetraazamacrocyclicligandscandirectlygivestablecom-plexesofsiIver(Il)throughdisproportionatedreactionofsilver(I).12fIere,wereportthesynthesisandeIectrochemicalbehaviorofanewsilver(Il)com-plexAgL(CIO')2(L=5,7,l2,l4-tetraethyl-5,l2-dimethyl-l,4,8,ll-tetraazacyclotetradec-4,l1-diene).Therelativeinformationaboutothersilver(1I… 相似文献
4.
《结构化学》2016,(7)
A new nickel(Ⅱ) complex Ni_2(L)_2(2,2?-bipy)2·5.5H_2 O with methy-bicycle[2.2.1]hept-5-ene-2,3-dicarboxylic acid(H2L) and 2,2?-bipyridine(2,2?-bipy) as ligands has been synthesized in the mixed solvent DMF and water(v:v = 5:2). It crystallizes in the triclinic space group P1 with a = 10.414(2), b = 12.884(3), c = 16.176(4) ?, α = 70.715(5), β = 80.599(5), γ = 77.383(6)o, V = 1989.4(8) ?3, Dc = 1.531 g/cm3, Z = 2, F(000) = 958, GOOF = 1.028, the final R = 0.0808 and w R = 0.2036. The crystal structure shows that the whole molecule consists of two independent dinuclear units, in which two nickel ions are bridged by two μ2-η1:η0 3-carboxylate groups of L2- anions. The coordination environment of Ni(Ⅱ) ion is Ni N_2O_3, giving a distorted square pyramidal geometry. The thermal stability and electrochemical properties of the complex were investigated. 相似文献
5.
Jin Yan WANG Shu De XIAO Xi Gao JIAN* Department of Polymer Science & Materials Dalian University of Technology Dalian 《中国化学快报》2003,14(4)
Aromatic polyimides are distinguished for their excellent mechanical and thermal properties in many engineering fields1. However, aromatic polyimides are normally insoluble in common organic solvents, which restricts their applications in some fields. Many efforts have been taken to improve their solubility. Introducing bulky side groups and non-coplanar structure into polymers bone chains is a good way to obtain the polymers with excellent mechanical and thermal properties2. In this paper… 相似文献
6.
IntroductionPoly(ferrocenylsilanes)areanovelclassoftransitionmetalorganometallicpolymerswithabackboneconsistingofalternatingferroceneandorganosilaneunits .Highmolecularweightpoly(ferrocenylenesilanes)wasfirstsyn thesizedviathermalring openingpolymerizati… 相似文献
7.
Amel Zitouni Abdelkrim Gouasmia Sabrina Bouguessa Lakhémici Kaboub Louiza Boudiba 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1744-1754
A new series of tetrathiafulvalene (TTF) molecules with extended π-system was prepared by using a Wittig reaction to generate the TTF key. The process of deprotection-alkylation of thiolates provided access to a wide variety of molecules. The study of their reducing power was carried out by cyclic voltammetry. Charge transfer complexes have also been chemically prepared by using TCNQ as an electron acceptor; the electrical conductivity of their compressed powders shows insulator behavior. The IR spectra of the TCNQ salts were recorded and used to characterize and estimate the degree of charge transfer of these complexes. GRAPHICAL ABSTRACT 相似文献
8.
9.
IntroductionELCisatechniquebywhichachemiluminescentreactionisgeneratedfromthereagentsproducedinthevicinityofanelectrodesurfac... 相似文献
10.
Synthesis and Properties of Novel Poly(amine ether)s 总被引:8,自引:0,他引:8
Using aromatic bis(4-bromophenyl) ether and various aromatic diamines as the monomers, a series of novel poly(amine ether)s (PAEs) have been synthesized via palladium-catalyzed aryl amination, which is the Hartwig-Buchwald polycondensation reaction. Their structures were characterized by means of elemental analysis, FT-IR, 1^H NMR and UV-Vis spectroscopy. The results show a good agreement with the proposed structures. Their general properties were studied by DSC and TG and it's obvious that they show high glass transition temperatures (Tg〉200 ℃), good thermal stability with high decomposition temperatures (TD〉500℃) and excellent solubility. The mechanical behavior of these polymers suggested that they could be considered a new class of high-performance polymers. 相似文献
11.
Francesco A. Bottino Giovanna Di Pasquale Nicoletta Leonardi Antonino Pollicino 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(11):1947-1955
Abstract A series of poly(ether sulfone)s and poly(ether ketone)s were synthesized from combinations of 1,5- and 2,6-bis(4-fluorosulfonyl)naphthalene, 2,6-bis(4-fluorobenzoyl)naphthalene, and 2,6-bis(4-fluorobenzoyl)quinoline with 3,3′,5,5′-tetramethylbiphenyl-4,4′-diol and 2,2′,3,3′,5,5′-hexamethylbiphenyl-4,4′-diol. The polycondensations proceeded quantitatively in diphenylsulfone in the presence of anhydrous potassium carbonate to afford polymers with inherent viscosities between 0.40 and 1.28 dL/g measured in N-methyl-2-pyrrolidone or concentrated sulfuric acid. The tetramethyl- and hexamethyl-substituted aromatic polyethers exhibited good thermal stability, did not decompose below 330°C in both air and nitrogen atmospheres, and had higher glass transition temperatures than the corresponding unsubstituted polymers. The methylsubstituted poly(ether sulfone)s and poly(ether ketone)s showed good solubility in such common organic solvents as N-methyl-2-pyrrolidone, N,N-dimethylacetamide, tetrahydrofuran, chloroform, and 1,4-dioxane. 相似文献
12.
A new copper(Ⅱ) complex [Cu2(MNA)2(2,2‘-bipy)2]·2.5H2 O with methy-5-norbornene-2,3-dicarboxylic acid(MNA) and 2,2’-bipyridine as ligands has been synthesized in the mixed solvents of DMF and water.It crystallizes in monoclinic,space group P 1,with a = 10.4191(11),b = 12.8883(13),c = 16.1114(16) ?,α = 70.8090(10),β = 80.568(2),γ = 77.440(2)o,V = 1984.3(4) ?3,Dc = 1.551 g/cm3,Z = 2,F(000) = 962,the final GOOF = 1.051,R = 0.0431 and w R= 0.0980.The crystal structure shows that the whole molecule consists of two independent dinuclear units,in which two copper ions are bridged by two μ2-η1:η0 3-carboxylate groups of MNA2-.The coordination environment of Cu(Ⅱ) ion is Cu O3N2,giving a distorted square pyramidal geometry.The spectroscopic characterization,thermal stability and magnetic properties of the complex were investigated. 相似文献
13.
《结构化学》2020,39(6):1070-1076
A new binuclear cobalt(Ⅱ) complex, [Co_2(C_(10)H_6NO_2)_2(C_(12)H_8N_2)_2(N_3)_2]·H2_O(1, C_(10)H_6NO_2~-: isoquinoline-1-carboxylate, C_(12)H_8N_2: 1,10-phenanthroline(phen); N_3~-: azide), has been synthesized though a mixed-solvothermal method using the pentanol and distilled water as solvent. The complex was characterized by elemental analysis, IR spectrum and single-crystal X-ray diffraction. It crystallizes in triclinic system, space group P1 with Z = 2, a = 1.777(5), b = 11.815(5), c = 17.141(7) ?, α = 74.496(6)°, β = 70.537(6)°, γ = 67.861(6)°, V = 2055.4(14) ?~3, Mr = 922.66, Dc = 1.491 g/cm~3, λ = 0.71073 ?, μ = 0.870 mm~(-1), F(000) = 942, R = 0.0455 and wR = 0.1147 for 4960 observed reflections with I 2σ(I) and S = 1.129. Its molecular structure is constructed by two Co~(2+) cations, two chelating phen ligands, two chelating isoquinoline-1-carboxylate ligands, two bridging linear azide anions and two uncoordinated half-occupied water molecules. The 3-D supramolecular network results from the multiple hydrogen bonds and π-π stacking interactions among three types of ligands. More importantly, its thermal stability, luminescent properties and magnetic properties have also been studied in detail. 相似文献
14.
Four novel perfluoroalkylated poly(arylene ether)s have been synthesized successfully using four perfluoroalkyl‐activated bisfluoro monomers. These polymers are synthesized through nucleophilic displacement of the fluorine atoms on the benzene ring with 4,4′‐thiodiphenol and are named as 1a, 1b, 1c and 1d, respectively. The polymers obtained by displacement of the fluorine atoms exhibit weight‐average molar masses up to 3.9×104 g · mol?1 in Gel permeation chromatography. These poly(arylene ether)s showed very high thermal stability up to 548°C for 10% weight loss in TGA under nitrogen and high glass transition temperature (Tg) up to 178°C in DSC depending on the repeat unit structures. The glass transition temperatures taken as peak in tan δ in DMA measurements are in good agreement with the DSC Tg values. All the polymers synthesized are soluble in a wide range of organic solvent such as CHCl3, CHCl2, THF, NMP, DMF and toluene. Transparent thin films of these polymers cast from THF exhibited tensile strengths up to 72 MPa, modulus up to 1.69 GPa with low elongation at break depending on their exact repeating unit structures. Rheological properties showed ease of processability of these polymers with no change in melt viscosity with temperature. 相似文献
15.
Yun Xing YAN* Xiao Qiang YU Dong WANG Xian ZHAO Qi FANG Min Hua JIANG State Key Laboratory of Crystal Materials Shandong University Ji抧an 《中国化学快报》2003,14(11):1203-1206
Two-photon absorption (TPA) is a process in which two photons are simultaneously absorbed to an excited state via a virtual state. The synthesis of organic optical materials with large TPA cross section has become a subject of great interest in recent years due to various application such as three-dimensional fluorescence imaging1, optical data storage2,3 and lithographic microfabrication4-6. Recently we have synthesized a new organic dye DEAHAS that is a symmetrically substituted stilbe… 相似文献
16.
The mono- and binuclear Cu(Ⅰ) complexes with substituted 2,2′-bipyridine and iodide ligands, [CuL2]BF4(L=4-methoxycarbonyl-6-(4-methylphenyl)-2,2′-bipyridine (a), 6-(4-hydroxymethylphenyl)-2,2′-bipyridine (b) and 6-(4-methoxylphenyl)-2,2′-bipyridine (c)) and [Cu2(μ-I)2L2] were prepared, and the crystal structures of the complexes were obtained from signal-crystal X-ray diffractional analysis. The spectroscopic properties of the complexes in dichloromethane are dominated by low energy MLCT bands from 360 to 650 nrn. The electrochemical studies of mononuclear complexes reveal that the complexes have stable copper(Ⅰ) state. 相似文献
17.
《中国化学快报》1997,(2)
Poly(orthoesters)isaclassofbiodegradablepolymersandtheirdegrada-tionratecanbereadilycontrolledbytheincorporationofacidicorbasicexcipi-entsintothepo1ymermatrix[1J.Severaltypes0fbiocompatiblepoly(orthoes-ters)havebeenextensivelyinvestigatedasthecarrierfordrugdeliverysys-tem[2J.However,lessw0rkhasbeendone0nointment-1ikepoly(orthoesters).Asadrugcarrier,theointment-likepoly(orthoesters)hastheadvan-tageofincorporatingtherapeuticagentsatr0omtemperatureandwithouttheuseofsolvents,andisidealf0rthedeliv… 相似文献
18.
<正>Poly(ether ether ketone)s(PEEK) are a class of high performance engineering thermoplastics known for their excellent thermal,mechanical,and electrical properties.This class of advanced materials has currently received considerable attention for potential application in aerospace,electronics,automobile and 相似文献
19.
Introduction Copper(I) complexes have received much attention for their being less expensive and environmentally friendly, various coordination geometry, rich photo-chemical and photophysical properties.1-7 It is well known that copper complexes with diimine (2,2'-bipy- ridine, 1,10-phenanthroline and their substituted deriva-tives designated as diimine) generally exhibit low en-ergy metal-to-ligand charge-transfer (MLCT) states lo-cated in the regions of 350650 nm (e ≈ 103—104 dm3昺ol-1昪… 相似文献
20.
Synthesis, Characterization and Properties of Tri-substitute Potassium Salt of Trinitrophloroglucinol 总被引:1,自引:0,他引:1
The title complex [K3(TNPG)·(H2O)2]n was synthesized by the reaction of the aqueous solutions of trinitrophlomglucinol (TNPG) with KHCO3. The complex was characterized by elemental analysis and FTIR spectroscopy, and its single crystal structure was determined by X-ray diffraction analysis. The structural analysis demonstrates that two different coordination modes of K cations [K(1) and K(2)] are around TNPG^3- anions in complex [Ka(TNPG)·(H2O)2]n, where the coordination numbers are eight. All K atoms coordinate with O atoms of phenolic hydroxyl group and nitro-group simultaneously. The thermolysis of the [Ka(TNPG) · (H2O)2]n has been investigated by using differential scanning calorimetry (DSC) and thermogravimetry-derivative thermogravimetry (TG-DTG) at a heating rate of 10 ℃/min. The thermal decomposition processes of the title complex were comprised of one endothermic dehydration stage and one exothermic decomposition stage in 270-320℃, and the final decomposition residue contained KNC. Impact and friction sensitivity results of the complex revealed its sensitive nature towards mechanical stimuli. The experiments verified that the complex has some characteristics of explosive. 相似文献