Sol-Gel Transition in Di-(2-ethylhexyl) phthalate-Plasticized Poly(vinyl chloride)

The gelation for di-(2-ethylhexyl) phthalate (DEHP)-plasticized poly(vinyl chloride) was studied by measuring time-resolved small-angle X-ray scattering (SAXS) and a flow of the solutions in test tube. It was found that for the gelation there were three regimes. At Regime I, the solution rapidly cha...

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Bibliographic Details
Published in:Bulletin of the Korean Chemical Society 2003, Vol.24 (10), p.1485-1489
Main Authors: Lee, Chang-Hyung, Nah, Jae-Woon, Cho, Kil-Won, Kim, Seong-Hun, Hahn, Ai-Ran
Format: Article
Language:Korean
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Summary:The gelation for di-(2-ethylhexyl) phthalate (DEHP)-plasticized poly(vinyl chloride) was studied by measuring time-resolved small-angle X-ray scattering (SAXS) and a flow of the solutions in test tube. It was found that for the gelation there were three regimes. At Regime I, the solution rapidly changed to a gel, and the SAXS intensity showed a peak and the peak intensity increased, keeping the peak angle constant. Applying the SAXS intensity to the kinetic analysis of the liquid-liquid phase separation, it was revealed that the spinodal decomposition proceeded to develop a periodic length of 29.9 nanometer in size, a hydrogen-bonding-type association in polymer rich phase followed, and then it induced fast gelation rate. At Regime II, the gelation slowly occurred and the SAXS intensity was not observed, suggesting that a homogeneous gel network was formed by a hydrogen-bonding. At regime III, the solution was a homogeneous sol.
ISSN:0253-2964
1229-5949