Sorption on porous copolymers of 1-vinyl-2-pyrrolidone-divinylbenzene

Sorption properties of porous copolymers 1-vinyl-2-pyrrolidone-divinylbenzene (VP-DVB) were investigated by thermogravimetry. Water, n-butanol and n-heptane were used as sorptives. The current studies were performed for VP-DVB copolymers which were synthesized under different condition and vary in terms of porous structure. Additionally, VP-DVB 5 sample has more polar character comparing with other samples. It was demonstrated that porous structure of the adsorbent has the fundamental impact on the adsorption process but not only the value of specific surface area but also the pore diameter plays important role. Sorption of water is enhanced by the presence of micropores and polar character of the adsorbent.     

Intermolecular reaction of 1-vinylimidazqle with 1-vinyl-2-pyrrolidone

Conclusions Using the IR spectroscopy method it was shown that 1-vinylimidazole exhibits intermolecular reaction with 1-vinyl-2-pyrrolidone to give the 11 associate.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1378–1379, June, 1979.     

Determination of 1-vinyl-2-pyrrolidone in human serum by high-performance liquid chromatography

Summary A simple method is described which allows the quantification of 1-vinyl-2-pyrrolidone (NVP) in human serum. NVP is extracted from serum with diethylether and determined with HPLC/UV-detection. 1-Cyclohexyl-2-pyrrolidone serves as an internal standard. The detection limit is 0.1 mg/l. The method has shown that NVP can enter the organisms of workers occupationally exposed to this substance.     

Pulsed-plasma polymerization of 1-vinyl-2-pyrrolidone: Synthesis of a linear polymer

The RF plasma induced polymerization of 1-vinyl-2-pyrrolidone was examined under variable duty-cycle pulsed-plasma conditions. Large-scale progressive changes in the composition of the resultant polymeric films were observed with sequential changes in the plasma duty cycle employed during polymerization, all other plasma variables held constant. The film compositional changes obtained are in the direction of increased retention of the lactam ring of the monomer in the resultant polymers as the duty cycles employed (i.e., the ratio of plasma on to plasma off times) were decreased. Particularly significant are the relatively linear polymeric structures obtained under the exceptionally low-average power deposition conditions made accessible with the pulsed plasma technique. XPS and FTIR spectroscopic examination of these latter films reveal compositions that are similar to those obtained by conventional (i.e., nonplasma) synthesis of the linear polymer. The film chemistry controllability demonstrated in the present study is achieved while maintaining the many advantages of the plasma polymerization approach for surface modifications. This work provides additional support for use of the pulsed operational mode as an effective means of film chemistry control, in particular extending the plasma polymerization technique to include synthesis of linear polymers, in lieu of the more highly crosslinked structures typically produced in conventional continuous-wave plasma polymerization processes. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 3121–3129, 1998     

Studies on adsorptive properties of porous copolymers for HPLC

The adsorptive properties of four porous copolymers were investigated. They contained different functional groups in the internal structure. Adsorption measurements were made using the static method. Three two-component and one three-component solutions with different physicochemical properties were used. The adsorptive centers of the copolymers were evaluated based on the analysis of excess adsorption isotherms of the polar solution component. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 2019–2024, 1998     

用作人工玻璃体的聚乙烯基吡咯烷酮水凝胶的流变性

合成了交联的聚乙烯基吡咯烷酮水凝胶,考察了凝胶在注射前和经WN12号针(直径1.18 mm)注射后的粘弹性.注射前,所有试样表现出交联网络的特征,即G′> G″且对ω的斜率接近零,并且随交联剂用量降低,储存模量和回弹性减小.注射后,部分试样模量急剧减小;未加交联剂的试样粘弹性保持不变;仅有样品B8注射后网络结构破坏较小,粘弹性变化很小且保持了注射前良好的回弹性,比其他各样品更适宜用作人工玻璃体.     

Synthesis and properties of alternating copolymers of carbon monoxide with 5-vinyl-2-norbornene

The alternating cooligomers of carbon monoxide and 5-vinyl-2-norbornene have been first synthesized in the presence of catalysts based on palladium complexes containing N^N and P^P ligands. It has been shown that the insertion of carbon monoxide proceeds for the most part via a C(2)-C(3) bond of the norbornene ring. The degree of involvement of both olefinic bonds of diene in alternating copolymerization is decreased when the reaction is carried out in a protic solvent (methanol). The structure of terminal groups of the copolymers depends on the nature of a bidentate ligand and acid.     

Porous DMN-co-GMA copolymers modified with 1-(2-hydroxyethyl)-2-pyrrolidone

Journal of Thermal Analysis and Calorimetry - Porous microspheres obtained from 2,3-epoxypropyl methacrylate (GMA) and 1,4-di(methacryloyloxymethyl) naphthalene (DMN) were modified by the reaction...     

1-Vinyl-1,2,4-triazole in copolymerization reaction with 1-vinyl-4,5,6,7-tetrahydroindole: synthesis and properties of copolymers

A radical copolymerization of 1-vinyl-1,2,4-triazole (VTA) with 1-vinyl-4,5,6,7-tetrahy-droindole (VTHI) was studied. New thermally stable functional copolymers of different composition, well soluble in organic solvents were synthesized. It was found that VTA has higher reactivity as compared to VTHI. A new soluble polymeric nanocomposite with metallic silver nanoparticles encapsulated into the matrix of synthesized copolymer was obtained.     

Study of interaction of poly(1-vinyl-2-pyrrolidone) with a surface of highly dispersed amorphous silica

Interaction of poly(1-vinyl-2-pyrrolidone) with the surface of highly dispersed silica and character of its thermal destruction were investigated by means of ad-desorption measurement, vibration and electron spectroscopy, and thermal gravimetric analysis with programmed heating. The correlation between the character of polymer keeping on the surface of silicon dioxide and its thermal decomposition was established.     

New photoluminescent copolymers of naphthalene-2,7-diol dimethacrylate and N-vinyl-2-pyrrolidone

Syntheses of the new photoluminescent copolymers: 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene with N-vinyl-2-pyrrolidone (NVP) are presented. The obtained compound was copolymerised with different ratios of active diluent (NVP). Thermo- and photo-polymerisations of the compositions with use of the initiators: α,α′-azoiso-bis-butyronitrile and 2,2-dimethoxy-2-phenyl-acetophenone were carried out. The following properties were determined: density, polymerisation shrinkage, glass transition temperature, Young’s modulus, hardness and tensile strength. Moreover, the dynamic-mechanical, thermal and photoluminescent properties were studied. These materials may have potential use as luminophores and coatings filtering harmful UV radiation.     

Chemically Crosslinked pH- and Temperature-Sensitive (N-isopropylacrylamide-co-1-vinyl-2-pyrrolidone) Based on New Crosslinker: I. Swelling Behavior

Novel pH- and temperature-sensitive polymer matrices based on N-isopropylacrylamide have been developed. The hydrogels were prepared by bulk radical polymerization of N-isopropylacrylamide and 1-vinyl-2-pyrrolidinone in appropriate amounts of distilled water using different mol% of traditional N,N-methylene bisacrylamide (MBA) and the new synthesized N,N,N-tris acryloyl melamine (MAAm) crosslinkers. Lower critical solution transition temperatures (LCST) were measured by differential scanning calorimetry. The synthesized hydrogels have LCST lower than 40°C. The influence of environmental conditions such as temperature and pH on the swelling behavior of these polymeric gels was investigated. The swelling behaviors of the resulting gels show pH sensitivity. The crosslinked NIPAAm/VP with MAAm hydrogels exhibited more rapid deswelling rate than NIPAAm/VP hydrogels crosslinked with MBA in pure water in response to abrupt temperature changes from 20°C to 50°C.     

The ligand properties of 2-vinyl-1,2-azaboratabenzene

Lithium 2-vinyl-1,2-azaboratabenzene 1b has been prepared by a multistep synthesis from 2,2-dibutyl-2,5-dihydro-1-trimethylsilyl-1H-1,2-azastannole 6. The reaction of 1b with one equivalent of [Cp¹RuCl]₄ gave the very labile sandwich compound 11. However, the reaction of 1b with 2 equiv. of [Cp¹RuCl]₄ afforded the stable diruthenium complex 12. The X-ray structure of 12 shows that the first Cp¹Ru moiety is π-bound to the 1,2-azaboratabenzene ring while the second is bound to Cl and to the nitrogen and the pendant B-vinyl of the 1,2-azaboratabenzene group.     

Synthesis and properties Of 1-vinyl-2, 2, 3, 3-tetrafluorocyclobutane

The oxidation, hydrobromination, and bromoacetylation of 1-vinyl-2, 2, 3, 3-tetrafluorocyclobutane are investigated, with a view to preparing its oxide. It is found that the most convenient method of preparing this oxide is acetyl hydroperoxide oxidation of 1-vinyl-2, 2, 3, 3-tetrafluorocyclobutane.The authors wish to thank V. A. Klimova and N. V. Korshun for elementary analyses, and B. V. Lopatina and L. V. Orlova for spectroscopic analyses of the compounds prepared.     

Electrical conductivity of copolymers of 1-vinyl-1,2,4-triazole with N-vinyl-4,5,6,7-tetrahydroindole

New copolymers of 1-vinyl-1,2,4-triazole with N-vinyl-4,5,6,7-tetrahydroindole of different compositions were synthesized. The processes of doping them with diiodine and electrophysical properties were studied. An increase in the electrical conductivity of the diiodinedoped copolymers by seven orders of magnitude due to the formation of charge-transfer complexes was observed.     

New network copolymers of 1-vinyl-1,2,4-triazole as efficient sorbents of mercury

The possibility of preparing copolymers by radical copolymerization of 1-vinyl-1,2,4-triazole with divinyl sulfide and divinyl diethylene glycol ether in the bulk was examined. The sorption characteristics of the new cross-linked copolymers with respect to mercury(II) ions under static conditions in acid solutions were studied.     

Hydrophilic functional copolymers of 1-vinyl-1,2,4-triazole with vinylsulfonic acid sodium salt

The free-radical copolymerization of 1-vinyl-1,2,4-triazole with vinylsulfonic acid sodium salt was conducted. New thermally stable functional water-soluble copolymers of various composition were synthesized. The structure and properties of the obtained copolymers were confirmed by IR, ¹H NMR spectroscopy, and thermogravimetric methods. It was found that 1-vinyl-1,2,4-triazole has higher reactivity than sodium vinylsulfonate. TGA and DSC show that the produced copolymers are stable when heated to 260 °C.     

Preparation and properties of co-oligomers of 1-vinyl-1,2,4-triazole with N-vinyl-2-phenylpyrrole

Novel water-soluble co-oligomers of 1-vinyl-1,2,4-triazole and N-vinyl-2-phenylpyrrole have been prepared by radical copolymerization. Copolymerization constants of the monomers and the parameters of cooligomers microstructure have been determined. 1-Vinyl-1,2,4-triazole is more reactive in the monomers pair. The prepared co-oligomers are thermally stable and reveal properties typical of paramagnetic organic semiconductors.