以烯丙基溴、对羟基苯甲酸乙酯和联苯二酚为原料合成了二对烯丙基醚苯甲酸联苯二酚酯.用DSC,~1H-NMR,FTIR,POM 和XRD对其进行了表征, 结果表明:该化合物熔点为185 ℃,在178 ℃出现一个晶型转变,清亮点为278 ℃,为近晶型液晶.以此液晶化合物与普通不饱和聚酯(UP)共聚合固化,研究了液晶化合物用量对产物微观形态和性能的影响,结果表明:液晶化合物的加入可提高共聚物的抗冲击强度,但当液晶加入的质量分数超过8%时会产生相分离.
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.
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