球形聚丙烯粒子固相接枝苯乙烯的研究  

SOLID PHASE GRAFT POLYMERIZATION OF STYRENE IN SPHERICAL POLYPROPYLENE GRANULES

作　　者：张艳中[1] 范志强[1] 刘钊[1] 张玉清[1] 封麟先[1] 

机构地区：[1]浙江大学高分子科学研究所,杭州310027

出　　处：《高分子学报》2002年第4期432-437,共6页Acta Polymerica Sinica

基　　金：国家重点基础研究专项经费资助项目 (项目号G19990 64 80 3 )

摘　　要：用负载型高效球形催化剂催化丙烯本体聚合获得了孔隙率较高的球形聚丙烯 (PP)粒子 .研究了苯乙烯在这种球形多孔PP粒子中的接枝聚合反应 ,考察了各种聚合条件对接枝率及接枝效率的影响 ,并用FTIR、DSC、GPC、粘度测定及偏光显微镜 (PLM)等方法表征了接枝聚合产物的结构和形态 .研究表明 ,球形PP粒子固相接枝苯乙烯不仅可达较高接枝率 (最高达 2 4 % )和接枝效率 (最高达 5 6 7% ) ,PS相区尺寸小、分布均匀 ,而且产物为形态规则的球形颗粒 ,有利于防止聚合物结块和粘壁 .但PP接枝PS后分子量有所下降 。Spherical polypropylene (PP) granules of high porosity were synthesized using a spherical high yield TiCl4/MgCl2 supported catalyst. As much as 50 wt% of styrene (St)/benzoyl peroxide (BPO) mixture (based on PP weight) was adsorbed into the PP granules, and solid phase graft polymerization of St was conducted under different conditions. Effects of various reaction parameters, such as St/PP weight ratio, BPO/St ratio, reaction temperature, and reaction time on the amount of grafted PS in PP,graft efficiency,and the molecular weight of product were investigated. The structure and phase morphology of the produced PP/PP-g-PS alloy was characterized by infrared (FTIR) differential scanning calorimetry (DSC), GPC, viscometry and polarized microscope (PLM). The results showed that solid phase graft polymerization of St in PP granule produced PP/PP-g-PS/PS alloy with high amount of grafted PS (maximum 24.3 wt% of PS based on PP/PP-g-PS) and high graft efficiency (maximum 56.7%). The size of PP crystals was greatly reduced after grafting PS on PP. The final product is, still in the form of regular spherical granules, which is beneficial to industrial process. Under the studied conditions, there was slight degradation of the PP chains in the graft reaction.

关 键 词：球形聚丙烯 苯乙烯 固相接枝 接枝率 接枝效率 改性 等规聚丙烯 

分 类 号：TQ316.6[化学工程—高聚物工业]