纳米二氧化硅表面接枝反应性相容剂协同增容聚苯乙烯/聚酰胺6  

Synergistic Compatibilization of Polystyrene/Polyamide 6 by Grafting Reactive Compatibilizer on Nano-SiO2 Surface

作　　者：章泽民 包建娜 陈康 张先明[1] 胡国华 Zemin Zhang;Jianna Bao;Kang Chen;Xianming Zhang;Guohua Hu(National and Local Joint Engineering Laboratory for Textile Fiber Materials and Processing Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China;Laboratory of Reaction and Process Engineering(UMR 7274),CNRS-Universite de Lorrainé,France)

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,浙江杭州310018 [2]Laboratory of Reaction and Process Engineering(UMR 7274),CNRS-Universite de Lorrainé,France

出　　处：《高分子材料科学与工程》2022年第10期72-80,共9页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51103135);浙江省人才项目(2019R52012)。

摘　　要：针对聚苯乙烯(PS)和聚酰胺6(PA6)热力学不相容引起共混物力学性能降低的问题,文中首先制得纳米SiO_(2)表面接枝苯乙烯(St)与3-异丙烯基-α,α,-二甲基苄基-异氰酸酯(TMI)共聚物为新型相容剂,并用于PS/PA6体系的反应性协同增容。扫描电镜和透射电镜分析结果表明,通过无机纳米粒子和异氰酸酯基团原位增容的协同作用可调控相容剂选择性分布,使两相界面张力减小,实现分散相PA6尺寸的降低、共混物相容性的提升。设计了不同异氰酸酯基团含量的相容剂,当添加量较少时(质量分数0.5%),拉伸强度最高增加了125.5%、断裂伸长率提升了128.1%,有效改善了PS/PA6由于热力学不相容引起的力学性能不佳的问题。The use of modified inorganic nanoparticles as compatibilizer for thermodynamically incompatible systems attracted much attention. However, the research of the influence of the grafting rate of reactive groups on the surface of inorganic nanoparticles on the compatibility and mechanical properties was relatively lacking. In this study,a typical polystyrene(PS) and polyamide 6(PA6) incompatible system was selected as blending system to study the influence of the grafting rate of different reactive groups on the compatibility, and in order to solve the thermodynamic incompatibility caused by PS and PA6 which results in the problem of reduced mechanical properties of blends. Firstly, the surface of nano SiO2grafted with the copolymer of styrene(St) and 3-isopropenyl-α,α,-dimethylbenzyl-isocyanate(TMI) was prepared as an new type of compatibilizer and used for the reactive synergistic compatibilization of PS/PA6 system. FT-IR results prove the existence of reactive groups(-NCO) and PS on the silica surface. The proportion of reactive monomers in the grafted copolymer molecular chain was obtained by chemical titration, and it is found that there is a positive correlation between the feed ratio of reactive monomers and the grafting rate. The results of TG and DSC verify the existence of grafted molecular chains on the surface of nano silica. Combined with the results of GPC, it is found that the addition of TMI reduces the molecular weight of the grafted chains and make the grafted chains more susceptible to thermal decomposition, but the decomposition temperature is much higher than the processing temperature in this study. Scanning electron microscope and transmission electron microscope results show that the selective distribution of the compatibilizer is controlled by the synergistic effect of the in-situ compatibilization of the isocyanate groups and inorganic nanoparticles and the interfacial tension of the two phases is reduced, so that the size of the dispersed phase PA6 is reduced and the compatibility is im

关 键 词：纳米二氧化硅 接枝改性 聚苯乙烯 聚酰胺6 反应型相容 

分 类 号：TB332[一般工业技术—材料科学与工程]