POLYVINYLACETATE-SiO2GELS OBTAINED IN HOMOGENEOUS MEDIA
作者:
D. Donescu,
M. Zaharescu,
K. Gosa,
S. Moscu,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 2000)
卷期:
Volume 21,
issue 7
页码: 815-837
ISSN:0193-2691
年代: 2000
DOI:10.1080/01932690008913314
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Polyvinylacetate-SiO2gels have been obtained by radical polymerization of vinyl acetate (VAc) in the presence of tetraethoxysilane (TEOS). The reaction system was: VAc:TEOS:EtOH:H2O:S (nonylphenol ethoxylated with 25 moles ethylene oxide) in different ratios. The reaction was performed at 65°C. The initiator of radical polymerization was benzoyl peroxide and a crosslinking agent of sol-gel process bis maleate of diethylene glycol. Traces of acetic acid, maleic acid or acrylic acid catalyze the polymerization of TEOS. The presence of the surfactant (S) ensures the homogeneity of the initial system. The conditions of obtaining homogeneous gels have been selected. Ternary diagrams containing TEOS:EtOH:H2O or (VAc+TEOS):EtOH:H2O:S were used in order to establish the domains of homogeneous compositions in the systems. Refractometric and conductometric measurements have shown that the mentioned systems are microemulsions. X-ray diffraction, surface area measurements, DTA/TGA method, as well as IR spectrometry have been used in the characterization of the gels obtained.
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