【摘要】 自行合成了不同种类的热致性液晶聚合物(TLCP),采用原位复合的方法制备了热致性液晶/玻璃纤维(GF)/不饱和聚酯(UP)原位混杂复合材料,研究了TLCP的种类对TLCP/GF/UP原位混杂复合材料的冲击、弯曲、蠕变、应力松弛、流变等性能的影响。结果表明,热致性液晶聚合物的加入能提高TL-CP/GF/UP复合材料的冲击和弯曲性能,其中加入5%LCMC的复合材料的冲击强度达到5.7 kJ/m2,是未改性体系的2.1倍,弯曲强度提高了1.2倍~1.6倍;蠕变和应力松弛研究表明,反应型的热致性液晶聚合物LCMC与不饱和聚酯发生交联,提高了复合材料的固化交联度,从而有效提高了复合材料的抗蠕变和应力松弛性能;液晶聚合物的加入,对复合材料的流变性能也有一定的影响。更多还原

【Abstract】 Different kinds of thermotropic liquid crystalline polymer(TLCP) were synthesized and incorporated into unsaturated polyester(UP).Effects of kinds of TLCP on the impact strength,bending strength,creep behavior,stress relaxation and rheological properties of TLCP/UP/GF in-situ hybrid composites were studied by Izod impact tester,universal mechanics testing machine and capillary rheometer,respectively.The results show that the impact strength and bending strength of TLCP/GF/UP composites containing TLCP are improved to some extent,especially,the TLCP/GF/UP composites which containing 5% LCMC increase most obviously.Its impact strength enhances 2.1 times,bending strength improves 1.6 times at most,compared with unmodified GF/UP composites.The results of creep behavior and stress relaxation tests reveal that reactive thermotropic liquid crystalline polymer strengthens the curing network.更多还原