动态交联对OBC和OBC/PP共混体系微观结构与力学性能的影响  

Effect of Dynamic Crosslinking on Microstructure and Mechanical Property of OBC and OBC/PP

作　　者：苏群峰 邹存英 邢恩晗 万禹江 王伟 王元霞 宋立新 李先亮 SU Qunfeng;ZOU Cunying;XING Enhan;WAN Yujiang;WANG Wei;WANG Yuanxia;SONG Lixing;LI Xianliang(College of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang Liaoning 110142,China;Liaoning Province Polymer High Performance Thin Film Engineering Research Center,Shenyang Liaoning 110142,China;BatteroTech Co.,Ltd.,Shanghai 201417,China;Advanced Manufacturing Institute of Polymer Industry,Shenyang University of Chemical Technology,Shenyang Liaoning 110142,China)

机构地区：[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142 [2]辽宁省高分子高功能薄膜工程研究中心,辽宁沈阳110142 [3]上海兰钧新能源科技有限公司,上海201417 [4]沈阳化工大学高分子产业高端制造研究院,辽宁沈阳110142

出　　处：《辽宁化工》2024年第12期1832-1836,共5页Liaoning Chemical Industry

基　　金：辽宁省攀登学者;辽宁省教育厅青年科技人才“育苗”项目(项目编号:LQ2019018)。

摘　　要：利用双螺杆挤出机、转矩流变仪等制备了动态交联乙烯-辛烯嵌段共聚物(OBC)、OBC/PP和动态交联OBC/PP共混体系,通过差示扫描量热仪、拉伸机、动态热机械分析和小角X射线衍射分析研究了纯OBC交联前后和共混OBC/PP交联前后的结晶行为、结构和力学性能的差异。结果表明:OBC交联后原结晶链段发生相分离,交联OBC提高了PP的结晶能力。DMA分析发现,交联后OBC和动态交联OBC/PP的β转化温度均升高。SAXS结果表明,OBC交联后晶体尺寸减小,OBC/PP中PP可结晶的短链段增多,导致可结晶链段变短。OBC交联后拉伸强度提高,断裂伸长率下降,动态交联OBC/PP拉伸强度提高,断裂伸长率没有明显变化,说明动态交联后的OBC/PP具有良好的力学性能。The dynamic crosslinked ethylene-octene block copolymer(OBC),OBC/polypropylene(PP) blends,and dynamically crosslinked OBC/PP blends were prepared using a twin-screw extruder,torque rheometer,and open mill.Differential scanning calorimetry(DSC),tensile testing,dynamic mechanical analysis(DMA) were used to investigate the crystallization behavior,structure,and mechanical properties of pure OBC before and after crosslinking,as well as crosslinked OBC/PP blends.The results revealed that after crosslinking,phase separation occurred in the originally crystalline segments of pure OBC,resulting in a significant decrease in the melting temperature.Compared to uncrosslinked OBC/PP,the crystallization peak of PP in dynamically crosslinked OBC/PP became sharper,indicating that the crosslinked OBC enhanced the crystallization ability of PP.DMA analysis showed that the β transition temperature of both crosslinked OBC and dynamically crosslinked OBC/PP increased.The SAXS results indicated a reduction in crystal size after crosslinking of OBC.In OBC/PP blends,an increased number of short PP segments were able to crystallize,with OBC intercalated within the PP matrix,leading to shorter crystallizable segments.The crosslinked OBC exhibited improved tensile strength but decreased elongation at break.Moreover,the dynamically crosslinked OBC/PP demonstrated enhanced tensile strength without significant changes in elongation at break,indicating favorable mechanical properties after dynamic crosslinking.

关 键 词：动态交联 交联OBC PP 力学性能 晶体结构 

分 类 号：TQ334.1[化学工程—橡胶工业]