The Effects of a Chain Extending Agent and Crosslinking Agent on the Toughness of Castor Oil based Polyurethane-Epoxy IPNs

Castor Oil형 폴리우레탄-에폭시 IPNs에서 사슬연장제와 가교제의 영향에 의한 강인성

  • Kim, Jong-Seok (Department of Chemical Engineering, Iksan National College) ;
  • Yang, Yeong-Seok (Department of Chemical Engineering, Woosuk University)
  • 김종석 (익산대학 화학공업과) ;
  • 양영석 (우석대학교 화학환경화공학부)
  • Received : 1998.05.11
  • Accepted : 1999.06.23
  • Published : 1999.08.10

Abstract

Interpenetrating polymer networks(IPNs) composed of castor oil(CO) polyurethane(PU) and epoxy resin were prepared by the simultaneous polymerization technique. Two types of PU were prepared using 1,4-butanediol(BD) and BD/trimethylolpropane(TMP) as a chain extending agent and crosslinking agent. The PU/epoxy based on BD as a chain extending agent showed more shift in the damping peak than PU/epoxy based on BD/TMP as the PU content was increased. BDPU/epoxy simultaneous interpenetrating polymer networks(SINs) had a better compatibility than BD/TMP-PU/epoxy SINs. For both systems, it was postulated that unique network formation of PU/epoxy SINs as a chain extending agent and crosslinking agent had occurred to a significant extent of phase mixing. The types of chain extender in the PU were found to be an important factor in determining the phase mixing of the IPNs. When the BD/TMP-PU reaction was faster than epoxy network, the extent of phase mixing was retarded by decreasing entanglement of networks. It was found that both PU/epoxy SINs provided enhanced flexural properties and fracture toughness, fracture surfaces of BDPU/epoxy and BD/TMP-PU/epoxy SINs showed the localized shear deformation and generation of stress whitening associated with the cavitation.

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