The Toughness of Polyurethane and Epoxy Resins IPNs

폴리우레탄-에폭시 IPNs의 강인성

  • Kim, Jong Seok (School of Chemical Engineering and Technology, Chonbuk National University) ;
  • Hong, Suk Pyo (School of Chemical Engineering and Technology, Chonbuk National University)
  • 김종석 (전북대학교 화학공학부) ;
  • 홍석표 (전북대학교 화학공학부)
  • Received : 1998.03.13
  • Accepted : 1998.05.12
  • Published : 1998.06.10

Abstract

Interpenetrating polymer networks(IPNs) were prepared from castor oil-type polyurethanes(PUs) and epoxy resin. Two types of PU were prepared by using polypropylene ether glycol(PPG) as a chain extending agent and caster oil(CO) as a crosslinking agent. COPU/epoxy simultaneous interpenetrating polymer networks(SINs) based on CO had a better compatibility over the all composition than PPGPU/epoxy SINs based on PPG. The flexural strength of all PPGPU/epoxy SINs was decreased with decreasing entanglement of networks. COPU/epoxy SINs showed the higher fracture toughness and mechanial properties than the PPGPU/epoxy SINs. Fracture surfaces of all of the SINs showed the localized shear deformation and crack deflection rather than generation of stress whitening associated with the cavitation.

Keywords

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