Synthesis of Liquid Crystalline p-BDAB and Its Modification Application on Unsaturated Polyester Resins

doi:10.3969/j.issn.1000-1565.2010.02.015

Abstract

Abstract: A novel thermotropic liquid crystalline compound of p-biphenylene di-4-(allyloxy)benzoate (p-BDAB) was synthesized from allyl bromide,ethylparaben and 4,4-dihydroxybiphenyl.Its structure and liquid crystalline behavior were characterized by DSC,~1H-NMR,FTIR,POM and XRD.The results showed that this compound was smectic liquid crystal.The temperature range of liquid crystal was 185-278 ℃.The unsaturated polyester (UP) was improved by p-BDAB.The morphologic structure of UP improved with p-BDAB was investigated.The results showed that p-BDAB had reacted with UP.The p-BDAB was dispersed in the UP in the sea-island structure.UP had higher impact strength when the mass fraction of p-BDAB was about 8%,but the mass fraction was over 8%,the phase separation would occur and the impact strength would decrease.

Key words: dihydroxybipheny, liquid crystal, unsaturated polyester

CLC Number:

O631.5

ZHANG Cai-yun,GAO Jun-gang,ZHANG Yuan-yuan. Synthesis of Liquid Crystalline p-BDAB and Its Modification Application on Unsaturated Polyester Resins[J]. Journal of Hebei University (Natural Science Edition), 2010, 30(2): 180-184.

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