Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Sol-Gel Transition in Di-(2-ethylhexyl) phthalate-Plasticized Poly(vinyl chloride)

  • Lee, Chang-Hyung (Department of Medical Devices & Radiation Health, Korea Food & Drug Administration) ;
  • Nah, Jae-Woon (Department of Polymer Science and Engineering, Sunchon National University) ;
  • Cho, Kil-Won (Department of Chemical Engineering, Pohang University of Science and Technology) ;
  • Kim, Seong-Hun (Department of Fiber & Polymer Engineering, Center for Advanced Functional Polymers, Hanyang University) ;
  • Hahn, Ai-Ran (Biotechnology & Environmenttal Eng. Div., Agency for Technology & Standards)
  • Published : 2003.10.20
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Abstract

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.

Keywords

References

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