HOMOPOLYMERIZATION AND COPOLYMERIZATION OF VINYL ACETATE IN NON-IONIC ICROEMULSIONS. I. A STUDY OF HOMOGENEITY DOMAINS
作者:
Dan Donescu,
Liana Fusulan,
Sever Serban,
Filip Chiraleu,
Cristian Petcu,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1996)
卷期:
Volume 17,
issue 7
页码: 701-715
ISSN:0193-2691
年代: 1996
DOI:10.1080/01932699608943534
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The homogeneity ranges of the systems consisting of the monomer (vinyl acetate or vinyl acetate + di-2-ethyl hexil maleate), cosurfactant (ethanol, n-propanol, n-butanol), surfactant (nonylphenol ethoxylate with 25 moles of ethylene oxide) and water were studied. Addition of the more hydrophobic comonomer requires utilization of a more hydrophobic cosurfactant. The increase of surfactant concentration entails the widening of the homogeneity range. The effect of the cosurfactants mentioned is accounted for by the modification of the cluster structure of water. Therefore the refractive indexes and the signals of protons in NMR spectra vary non-linearly with the composition of homogeneous systems. DSC analysis of the systems obtained has come out with two crystallization temperatures of water undercooled to −60°C in systems of concentrations close to those of organic and aqueous phases. The results plead for the existence of a structure which differs from that of the ideal solutions of the systems studied.
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