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超支化聚乙烯亚胺接枝二氧化硅的制备及在聚丙烯改性中的应用
引用本文:黄寅峰,张明祖,倪沛红.超支化聚乙烯亚胺接枝二氧化硅的制备及在聚丙烯改性中的应用[J].高分子学报,2012(3):250-255.
作者姓名:黄寅峰  张明祖  倪沛红
作者单位:苏州大学材料与化学化工学部江苏省先进功能高分子材料设计及应用重点实验室 苏州215123
基金项目:江苏高校优势学科建设工程资助项目
摘    要:首先利用3-缩水甘油氧基丙基三甲氧基硅烷(简称GPS)作为偶联剂,对纳米SiO2进行表面改性,获得表面含有环氧基的SiO2纳米粒子(SiO2-GPS).利用这些环氧基与超支化聚乙烯亚胺(HPEI)分子中的氨基进行反应,得到SiO2接枝超支化聚乙烯亚胺的纳米粒子(SiO2-GPS-g-HPEI).然后利用SiO2-GPS-g-HPEI与聚丙烯(PP)和PP接枝的马来酸酐(PP-g-MAH)共混、模压,制备PP/SiO2-GPS-g-HPEI/PP-g-MAH复合材料.红外光谱测试和热失重分析(TGA)测试结果表明,SiO2纳米粒子表面依次接枝了GPS和HPEI;扫描电子显微镜(SEM)的测试结果显示,SiO2-GPS-g-HPEI在聚丙烯基体中分散良好,其材料的冲击断裂为韧性断裂;复合材料共混时,扭矩的增加证明了共混物中分散相(SiO2-GPS-g-HPEI)与基体(PP/PP-g-MAH)界面之间存在一定的相互作用.少量SiO2-GPS-g-HPEI加入PP/PP-g-MAH中,冲击强度可增加96.3%,拉伸强度也有较大的提高.

关 键 词:纳米材料  SiO2表面改性  PP改性  力学性能

PREPARATION OF HYPERBRANCHED POLY(ETHYLENE IMINE) GRAFTED NANO-SiO2 AND USING FOR MODIFICATION OF POLYPROPYLENE
Yin-feng Huang , Ming-zu Zhang , Pei-hong Ni.PREPARATION OF HYPERBRANCHED POLY(ETHYLENE IMINE) GRAFTED NANO-SiO2 AND USING FOR MODIFICATION OF POLYPROPYLENE[J].Acta Polymerica Sinica,2012(3):250-255.
Authors:Yin-feng Huang  Ming-zu Zhang  Pei-hong Ni
Institution:(College of Chemistry,Chemical Engineering and Materials Science,Soochow University, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application(Soochow University),Suzhou 215123)
Abstract:3-Glycidoxypropyltrimethoxysilane(GPS) was first used as a coupling agent to react with SiO2 nanoparticles to yield the modified SiO2 nanoparticles with epoxy groups on the surface of the nanoparticles(SiO2-GPS).In order to obtain the amine-riched SiO2 nanoparticles on the surface,hyperbranched poly-(ethylene imine)(HPEI) was mixed with SiO2-GPS and then a reaction occured between epoxy groups and amine groups,resulting to a poly(ethylene imine) grafted SiO2 nanoparticles(SiO2-GPS-g-HPEI).Subsequently,SiO2-GPS-g-HPEI was added into a blend of polypropylene and polyproplyene-grafted-maleic anhydride(PP/PP-g-MAH) to enhance the strength of PP.The modified SiO2 nanoparticles were characterized by Fourier transform infrared spectroscopy(FTIR),thermo gravimetric analysis(TGA) and scanning electron microscopy(SEM),respectively.The results showed that GPS and HPEI had been grafted onto the surface of SiO2 nanoparticles,which had well dispersity in matrix of PP.After blending by Haake Rheomix600 OS viscometer,the blend was molded into a sheet by compression,and testing specimens were cut from the molded sheets by a die cutter.The samples were characterized by tensile strength and notched impact strength.The results of scanning electron microscopy(SEM) revealed the tough fracture.The torque curve of ternary blending(on behalf of the viscosity) was increased,indicating that the reaction happened in blending.The notched impact strength of PP/PP-g-MAH increased by 96.3% compared to pure PP after adding 2% SiO2-GPS-g-HPEI.Moreover,tensile properties of the nanocomposites were also enhanced.
Keywords:Nanocomposites  Modification of SiO2  Modification of PP  Mechanical properties
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