摘要
通过乳液聚合制备粉末状聚苯乙烯(PS),以浓HNO_3和浓H_2SO_4的混合酸为硝化试剂对PS进行硝化,制备了聚对硝基苯乙烯(PPNS),再以SnCl_2HCl为还原剂将PPNS还原为聚对氨基苯乙烯(PPAS)。利用傅里叶变换红外光谱仪、热重分析仪和差示扫描量热仪研究了聚合物的结构和性能,考察了温度、时间和酸配比对硝化反应的影响。结果表明:PS的苯环上引入了硝基,且PPNS被还原为PPAS;PPNS和PPAS均分两阶段热分解;PS,PPNS,PPAS失重50%的温度分别为400,346,322℃,说明三者热稳定性依次降低。PPNS的玻璃化转变温度(T_g)随硝化率的增加而升高。合成的PPAS也具有较高T_g。升高温度、延长时间以及增加混合酸中硫酸的体积,硝化率均提高。
The authors studied the performance of a home-made magnesium chloride （MgCl2）-butanol （BuOH）/titanium chloride（TiCl4） catalyst used for ethylene homoor eopolymerization under different reaction eonditions. The influences of hydrogen pressure, molar ratio of AI to Ti and comonomer concentration on catalyst activity and polymerization kinetics were examined. Melt flow rate, bulk density and tensile properties of polymerization product were tested, and relative molecular mass and its distribution and chain structure were characterized. The rules of the effects of polymerization conditions on MgCl2-BuOH/TiCl4 catalyst and the properties of the product were given in the paper.
出处
《合成树脂及塑料》
CAS
北大核心
2009年第6期22-26,共5页
China Synthetic Resin and Plastics
基金
河北省自然科学基金面上资助项目(B2009000160)
河北大学博士基金资助项目(Y2007093)
