环氧液晶对木质素/聚丙烯复合材料结构和性能影响  

Effect of epoxy liquid crystalline on the structure and properties of lignin/PP composites

作　　者：郭栋[1] 陆绍荣[1] 刘括[1] 罗崇禧[1] 李善荣[1] 

机构地区：[1]桂林理工大学有色金属及材料加工新技术教育部重点实验室,广西桂林541004

出　　处：《热固性树脂》2012年第6期44-47,共4页Thermosetting Resin

基　　金：广西自科基金项目(0991003Z;0842003-4A);广西科技攻关项目(0992022-4)资助

摘　　要：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。One small molecular liquid crystalline epoxy（LCEP） was synthesized by substitution reaction of 4,4′-bis-（β-hydroxyhexoxy）biphenyl（BP2） with epichlorohydrin and 1,4-benzenedicarbonyl dichloride,then the LCEP was blended with lignin/polypropylene（PP） for modification.The structure and liquid crystal phase transition behavior of LCEP were characterized and the effects of LCEP amounts on the mechanical properties and thermal properties of lignin/PP composites were investigated by using FT-IR,DSC,POM and TGA.The composite fracture morphology was observed by SEM and the toughening mechanism was discussed.The results showed that the composites adding 4% LCEP had the best overall performance and the impact strength,flexural strength and flexural modulus were increased by 38.6%,30.5% and 20%,respectively compared with that of unmodified ones.The thermal stability,crystallinity and crystallization rate were also significantly improved.

关 键 词：环氧液晶 木质素 聚丙烯 复合材料 增韧 耐热 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]