不同聚丙烯发泡体系的流变性能研究  

Rheological Behavior of Different Polypropylene/Nano-clay Extrusion Foaming Systems

作　　者：王向东[1] 刘本刚[2] 陈士宏[2] 张玉霞[2] 杜中杰[1] 励杭泉[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京工商大学材料科学与工程系,北京100037

出　　处：《中国塑料》2007年第11期36-41,共6页China Plastics

基　　金：北京市自然科学基金资助(项目编号 2062008)

摘　　要：采用 ARES 流变仪和毛细管流变仪,对线形聚丙烯(LPP)、长链支化聚丙烯(LCBPP)、LPP/LCBPP 共混体系分别与纳米黏土的复合发泡体系的动态剪切和稳态剪切流变性能进行了研究。考察了复合体系制备过程中螺杆转速、相容剂含量对复合体系熔体弹性的影响,研究了不同温度下复合体系的剪切黏度、剪切应力与剪切速率之间的关系。结果表明:将纳米黏土引入 PP 发泡体系中可有效改进 PP 树脂的可发性。复合体系制备过程中,螺杆转速并未对 LPP、LCBPP 与纳米黏土复合体系的熔体弹性产生影响;随相容剂马来酸酐接枝聚丙烯用量的增加,LPP、LCBPP/纳米黏土复合体系的熔体弹性有小幅降低,但幅度并不显著;LCBPP/纳米黏土复合体系的剪切黏度具有较高的温度敏感性,随温度升高,表观剪切黏度下降显著。在低剪切速率区,LCBPP/纳米黏土复合体系的表观剪切黏度低于LPP、(LCBPP/LPP)/纳米黏土复合体系,但在高剪切区,三者的剪切黏度趋于接近。Dynamic and steady-state shear rheological behaviors of linear polypropylene（LPP）/nano-clay composite, long chain branching polypropylene （LCBPP）/nano-clay composite and （LPP/LCBPP）/ nano-clay composite used for extrusion foaming were studied by the ARES rheometer and a capillary viscosimeter. Effects of screw rotating speed and compatibilizer dosage on the melt elasticity of the composites were deal with. Relationships among the shear stress, shear viscosity and shear rate were also probed. The results showed that the melt elasticity of the LPP/nano-clay and LCBPP/nano-clay composites were not affected by the screw rotating speed. The melt elasticity of the LPP/nano-clay and LCBPP/nano-clay composites dropped slightly with the increasing PP-g-MAH dosages. Shear viscosity of the LCBPP/nano-clay composite exhibited high temperature-sensitive. Apparent shear viscosity decreased remarkably with the temperature increasing. The apparent shear viscosity of the LCBPP/nanoclay composite was lower than that of LPP/nano-clay and（LCBPP/LPP）/nano-clay composite within low shearing domain, but nearly the same within the high region.

关 键 词：流变性能 聚丙烯 挤出发泡 纳米黏土 复合体系 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]