Volume 31 Issue 10
Oct.  2005
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Sun Zhijie, Xue Zhongmin, Yang Bo, et al. Effect of low profile additives on the shrinkage and mechanical properties of unsaturated polyester[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(10): 1096-1100. (in Chinese)
Citation: Sun Zhijie, Xue Zhongmin, Yang Bo, et al. Effect of low profile additives on the shrinkage and mechanical properties of unsaturated polyester[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(10): 1096-1100. (in Chinese)

Effect of low profile additives on the shrinkage and mechanical properties of unsaturated polyester

  • Received Date: 08 Jun 2004
  • Publish Date: 31 Oct 2005
  • In order to reduce the high shrinkage ratio and great brittleness of UPR(unsaturated polyester resin), two kinds of LPA(low profile additives), which are LPA-4016 of polyvinyl acetate and LPA-7301 of polystyrene, are added into UPR cast separately. The effects of LPA on the shrinkage rate and mechanical properties of UPR cast are studied, and then the phase structure transitions of these two systems and their different control mechanisms of low shrinkage rate are analyzed. For LPA-4016, it is by formatting amounts of uniform and disperse voids around the LPA phase to buck the shrinkage during resin cure; while for LPA-7310, this is realized primarily by the sufficient expansion of LPA itself. The results show that there exists an optimal quantity for LPA-4016 to reduce shrinkage rate of UPR, and it can improve the brittleness of UPR and increase its impact strength in contrast with LPA-7310. But both of them tend to reduce the tensile strength of UPR.

     

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