Effect of Variation in the Molecular Structure on the Miscibility of Modified Polystyrene/Polymethacrylate Blends

Modified Polystyrene/Polymethacrylate 블렌드의 상용성에 대한 분자구조 변화의 영향

  • Koo, Chung-Wan (Department of Fine Chemicals Engineering and Chemistry, Chungnam National University) ;
  • Kim, Hyung-Il (Department of Fine Chemicals Engineering and Chemistry, Chungnam National University) ;
  • Kim, Byeong Cheol (Faculty of Chemical Engineering and Technology, Chonbuk National University)
  • 구충완 (충남대학교 공과대학 정밀공업화학과) ;
  • 김형일 (충남대학교 공과대학 정밀공업화학과) ;
  • 김병철 (전북대학교 화학공학부)
  • Received : 1999.05.10
  • Accepted : 1999.06.05
  • Published : 1999.08.10

Abstract

The component polymer was modified to enable the formation of intermolecular hydrogen bonding in the immiscibile polystyrene(PS)/polymethacrylate(PMA) blends. The mole percentages of hydroxystyrene of the poly(styrene-co-4-hydroxystyrene) copolymer(modified polystyrene, MPS) were controlled to 7%, 10% and 18%, respectively. MPS was used with PMA to study the variation of the miscibility in blends. PMA which had such different length of side chain as methyl, butyl, hexyl and ethylhexyl, respectively, was selected to study the effect of side chain length on the formation of intermolecular hydrogen bonding. As the hydroxyl content of MPS increased, the formation of intermolecular hydrogen bonding increased. The length of side chain of PMA had enormous effect on the miscibility of blend as confirmed from the result of cloud point measurement. As the length of side chain increased, the formation and the strength of intermolecular hydrogen bonding decreased severely due to the steric effect and the increased chain mobility.

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