IPP/Nano-CaCO_3复合材料的制备及其结晶行为的研究  

Study on Crystallization Behavior of IPP/Nano-CaCO_3 and Its Preparation

作　　者：张勤星[1] 范建勇[1] 董自开[1] 王亚滨[1] 李倩[1] 

机构地区：[1]郑州大学橡塑模具国家工程研究中心,河南郑州450002

出　　处：《塑料科技》2013年第4期43-46,共4页Plastics Science and Technology

基　　金：国家重点基础研究发展计划(2012CB626809)

摘　　要：通过熔融共混,制备了等规聚丙烯(iPP)/纳米碳酸钙(nano-CaCO3)复合材料,研究了不同剪切环境下nano-CaCO3粒子在聚丙烯(PP)基体中的分散性能及其对基体熔融过程的影响,并利用广角X射线散射仪(WAXS)、差示扫描量热仪(DSC)、偏光显微镜(PLM)、扫描电镜(SEM)考察了该复合材料的结晶行为。结果表明:在剪切环境中,nano-CaCO3粒子与基体的摩擦、碰撞几率增加;随着nano-CaCO3用量的增加,体系剪切热升高,加快了基体熔融的速度,并改善了nano-CaCO3的分散效果。当nano-CaCO3用量低于3%时,其在PP基体中起到成核剂的作用,提高了PP的结晶度,并诱导β型晶体的生成;当其用量超过3%时,nano-CaCO3在基体中的分散效果降低,导致粒子团聚,对基体的成核作用降低,进而降低了复合材料的结晶度,并且削弱了粒子对基体的诱导形成β型晶体的能力。Isotactic polypropylene（iPP）/nano-CaCO3 composites were prepared via melt blending.The crystallization and melting behavior of iPP/nano-CaCO3 composites,and dispersion efficiency of nano-CaCO3 were investigated by torque rheometer,wide angle X-ray scattering（WAXS）,differential scanning calorimetry（DSC）,scanning electron microscope（SEM） and polarized light microscope（PLM）.The results show that nano-particles enhance the shear heat which caused by more collision chance between nano-particles and iPP.Nano-CaCO3 plays an important role in nucleation and inducing β crystal during crystallization of iPP.Dispersion efficiency of nanoCaCO3 increases when nano-CaCO3 content is less than 3%,and performances of nucleation and inducing β crystal decrease on account of agglomeration of nano-CaCO3when nano-CaCO3 content is greater than 3%.

关 键 词：等规聚丙烯 剪切 纳米碳酸钙 分散性能 团聚 成核剂 诱导 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TQ327.8