Effects of Zinc Stearates on the Thermal and Rheological Properties of Polystyrene Ionomers

폴리스티렌 이오노머의 열적·유변학적 성질에 미치는 스테아린산 아연의 영향

  • Kim, Jong-sang (Faculty of Chemical Engineering and Technology, Chonbuk National University) ;
  • Doo, Jun Kil (Faculty of Chemical Engineering and Technology, Chonbuk National University) ;
  • Lee, Dai Soo (Faculty of Chemical Engineering and Technology, Chonbuk National University)
  • 김종상 (전북대학교 공과대학 화학공학부) ;
  • 두준길 (전북대학교 공과대학 화학공학부) ;
  • 이대수 (전북대학교 공과대학 화학공학부)
  • Received : 1999.11.10
  • Accepted : 1999.11.30
  • Published : 1999.12.10

Abstract

Different amounts of zinc stearate were incorporated as a plasticizer into poly(styrene-co-sodium methacrylate) ionomers prepared by bulk-suspension plymerization and neutralization with sodium hydroxide and effects of the zinc stearate on the thermal and rheological properties were investigated. It was obseved that the crystallization of zinc stearate in the ionomers were partially suppressed depending on the content of ionic moieties. It is postulated that the ionic moieties dissolved zinc stearate and suppressed crystallization of the zinc stearates. We speculated that 0.4~0.6 mole of zinc stearate was dissolved by one mole of the ionic moiety. Poly(styrene-co-sodium methacrylate) containing only the dissolved zinc stearates showed typical rheological properties of homogeneous systems in Cox-Mertz plots. However, poly(styrene-co-sodium methacrylate) containing crystallizable zinc stearates as well as dissolved ones showed typical rheological properties of heterogeneous systems.

Keywords

polystyrene ionomer;zinc stearate;thermal property;rheological property

Acknowledgement

Supported by : 한국과학재단

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