作　　者： ; ; ; ; (王琳）;

机构地区： 中国科学院广州地球化学研究所

出　　处： 《塑料》 2004年第2期23-28,69,共7页

摘　　要： 利用力学性能、熔体流动速率等性能的测定等方法考察了一种稀土偶联剂(WOT)对CaCO3、BaSO4、Mg(OH)2、Mica和Talc等无机粒子的表面处理作用。发现经WOT处理的CaCO3与聚丙烯(PP)的复合物,在一定条件下缺口冲击强度可达到纯PP的2倍、断裂伸长率可达纯PP的3倍左右,表现出显著的无机粒子增韧效果;利用FTIR、SEM等考察了无机刚性粒子增韧PP的结构形态及增韧机理,表明WOT在处理过程中与CaCO3之间除了物理吸附作用外,还发生了化学作用,在CaCO3表面形成了牢固的包覆层,改变了无机粒子的表面性能;并且经WOT处理的CaCO3还具有β晶型成核剂的作用。 A rare earth-containing complex (WOT) was used as surface modifier to treat CaCO_3,BaSO_4,Mg(OH)_2,Mica and Talc and its efficacy was assessed.The examination of mechanical properties and melt flow rate (MFR) of polypropylene (PP)/ mineral composites demonstrated that WOT treatment could considerably improve the dispersion of filler in nonpolar media.The FTIR spectrum analysis revealed that the WOT bonded to the CaCO_3 surface not only by physical absorption but also by a chemical reaction.The WOT could change the surface properties of CaCO_3,resulting in greater hydrophobicity of the surface and enhanced compatibility with nonpolar matrices.The mechanical properties and melt flow rate (MFR) examination of polypropylene (PP)/CaCO_3 composites showed that WOT treatment remarkably enhanced the toughness and MFR of composites at higher filler loading.The fractured surface observation with SEM showed improved filler dispersion and enhanced interfacial adhesion between the filler and matrix in PP composites filled with WOT-treated CaCO_3.All these improvements demonstrated that WOT is an effective surface modifier of CaCO_3.

关 键 词： 偶联剂 聚丙烯 表面改性剂 力学性能 成核剂

领　　域： [化学工程]