高熔体强度聚丙烯的制备及性能表征  

Preparation and Characterization of High Melt Strength Polypropylene

作　　者：史为轩 黎剑浩 赵世成[1] SHI Weixuan;LI Jianhao;ZHAO Shicheng(Shanghai Key Laboratory of Multiphase Materials Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;CNOOC Institute of Chemical&Advanced Materials,Beijing 102200,China)

机构地区：[1]上海市多相结构材料化学工程重点实验室,华东理工大学化工学院,上海200237 [2]中海油化工与新材料科学研究院,北京102200

出　　处：《塑料工业》2024年第3期56-61,共6页China Plastics Industry

基　　金：国家自然科学基金项目(21878089)。

摘　　要：采用等规聚丙烯(iPP)为粉料、过氧化苯甲酰(BPO)为引发剂、三羟甲基丙烷三丙烯酸酯(TMPTA)为接枝单体、苯乙烯(St)为共聚单体,使用双螺杆挤出机熔融接枝制备无凝胶的高熔体强度聚丙烯(HMSPP)。傅里叶红外光谱(FTIR)和凝胶渗透色谱(GPC)的结果表明单体已成功接枝在聚丙烯分子链上。差示扫描量热仪(DSC)的分析结果表明HMSPP结晶温度提高了11.8℃。流变测试结果显示,HMSPP可呈现明显的剪切稀化现象,并具有更长的松弛时间和更低的损耗因子,充分证明了长支链结构的存在。与iPP相比,HMSPP的熔体强度从0.03 N提高到0.37 N,同时其冲击强度、拉伸强度和弯曲模量分别提高了89.1%、17.5%、42.6%。Using isotactic polypropylene(iPP)as the powder,benzoyl peroxide(BPO)as the initiator,trimethylolpropane triacrylate(TMPTA)as the graft monomer,styrene(St)as the co-monomer,the high melt strength polypropylene(HMSPP)without gels was prepared by a twin-screw extruder.The results of Fourier transform infrared spectroscopy(FTIR)and gel permeation chromatography(GPC)indicate that the monomers have been successfully grafted onto the polypropylene molecular chains.Differential scanning calorimetry(DSC)results show that the crystallization temperature of HMSPP increases by 11.8℃.The rheological test results show that the HMSPP exhibits significant shear thinning phenomenon with a longer relaxation time and a lower loss factor,proving the presence of long branched structures.Compared with iPP,the melt strength of HMSPP increases from 0.03 N to 0.37 N,while its impact strength,tensile strength and flexural modulus increase by 89.1%,17.5%and 42.6%,respectively.

关 键 词：聚丙烯 反应挤出 流变 长支链 熔体强度 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]