用过氧化二苯甲酰作为引发剂,合成了几种N-乙烯基吡咯烷酮(NVP)/甲基丙烯酸β-羟乙酯(HEMA)/甲基丙烯酸酯(RMA)共聚物水凝胶,用差热扫描量热法(DSC)和热重法(TG)对这些亲水凝胶中吸附水的状态进行了研究和比较。 2. Hydrogel was synthesized by copolymerization ofNVP,HEMA and MMA,with BPO as an initiator...
The glass-transition temperature (Tg) values of the copolymers were measured by Differential Scanning Calorimetry and examined by means of several theoretical equations, allowing for the prediction of these Tg values. Subsequently, a systematic and detailed investigation of the thermal degradation of ...
Another copolymer sample with only 1.6 mol% bifunctional monomer gives the same Tg as crospovidone, but !50 Polymer J., Vol. 17, No. I, 1985 Polymers of N-Vinylpyrrolidone: Synthesis, Characterization, and Uses has a much larger degree of swelling due to the lack of physical cross-links....
用过氧化二苯甲酰作为引发剂,合成了几种N-乙烯基吡咯烷酮(NVP)/甲基丙烯酸β-羟乙酯(HEMA)/甲基丙烯酸酯(RMA)共聚物水凝胶,用差热扫描量热法(DSC)和热重法(TG)对这些亲水凝胶中吸附水的状态进行了研究和比较。 2. Hydrogel was synthesized by copolymerization of NVP,HEMA and MMA,with BPO as an initiat...
N-vinylpyrrolidoneNMR spectroscopyquantum chemical calculationsDecomposition of benzoyl peroxide in solution or bulk of N -vinylpyrrolidone, as well as in its mixtures with maleic anhydride and/or methyl methacrylate, was studied by 1 Н NMR spectroscopy. It was found that the benzoyl...
The structures of complex-bound molecules are examined with respect to changes in the charges on terminal -C1=C2- groups, the distance between them and atoms in an H-bond, and the presence of combined overlapping molecular orbitals (MOs). The presence of an averaged complex that includes ...
In combination the results of SEM, TG-DTA and DSC, it was conducted that the ratio of functional groups of VP had a critical effect on the surface morphology, thermal stability of the hybrid films. Irradiated with ultraviolet light, the transparent thin hybrid films change from colorless to ...
C. VarverisT. G. MarisJournal of Physics Conference SeriesPapadakis A, Maris T, Zacharopoulou F, Pappas E, Zacharakis G, Damilakis J, "An evaluation of the dosimetric performance characteristics of N-vinylpyrrolidone based polymer gels," Phys. Med. Biol. 52, 5069-5083, 2007....
poly(N‐vinylpyrrolidone)Polymer blends of poly(N-vinylpyrrolidone) (PVPr) and poly(styrene-co-4-vinylphenylmethylphenylsilanol) (ST-VPMPS) copolymers with varying amounts of VPMPS monomer units have been investigated. Glass transition temperature (Tg) measurements indicated that miscible blends of ...
Molecular ComplexMaleic AnhydrideMonomer MixtureSchemes of complex formation and decomposition in monomers copolymerization in the absence of initiator (313 K) are suggested. The energy of formation of π-H- and H-complexes of N -vinylpyrrolidone with maleic anhydride, methyl methacrylate, or two ...