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

Bulletin of the Korean chemical society

Chang Hyung Lee¹  Kil-Won Cho¹  Airan Hahn¹  Seong Hun Kim¹  Jae-Woon Nah¹ 

关键词: Sol-gel transition;    DEHP-plasticized PVC;    Small angle X-ray Scattering;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown