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以4,4’-二(β-羟乙氧基)联苯(BP2)、环氧氯丙烷及对苯二甲酰氯等为原料,通过取代反应合成一种小分子的环氧液晶(LCEP),将该LCEP与木质素(lignin)/聚丙烯(PP)进行共混改性,采用FT-IR、DSC、POM及TGA等对LCEP结构和液晶相转变行为进行了表征,并研究了LCEP含量对Lignin/PP复合材料物理力学性能和热性能的影响。利用SEM观察了复合材料断裂形貌,探讨其增韧增强机理。结果表明:加入4%的LCEP聚丙烯/木质素复合材料的综合性能最好,其冲击强度、弯曲强度和弯曲模量较未改性前分别提高了38.6%、30.5%和20%,热稳定性、结晶性和结晶速率也有明显提高。
A small molecule of epoxy liquid crystal (LCEP) was synthesized by substitution reaction with 4,4’-bis (β-hydroxyethoxy) biphenyl (BP2), epichlorohydrin and terephthaloyl chloride as raw materials. , The LCEP and lignin / polypropylene (PP) were blended and modified, the structure and liquid crystal phase transition behavior of LCEP were characterized by FT-IR, DSC, POM and TGA. The effects of LCEP content Effect on Physical and Thermal Properties of Lignin / PP Composites. The fracture morphology of the composites was observed by SEM, and the toughening and strengthening mechanism was discussed. The results showed that the best properties of LCEP / Lignin composites with addition of 4% were 38.6%, 30.5% and 20% respectively, and the impact strength, flexural strength and flexural modulus increased by 38.6%, 30.5% and 20% Sex, crystallinity and crystallization rate also increased significantly.