二氧化硅对等规聚丙烯和共聚聚丙烯结晶和熔融行为的影响  

Effect of Silicon Dioxide on Crystallization and Melting Behavior of Isotactic and Copolymerized Polypropylene

作　　者：陈民杰[1] 田国华[1] 张勇[1] 万超瑛[1] 张隐西[1] 

机构地区：[1]上海交通大学高分子材料研究所,上海200240

出　　处：《中国塑料》2005年第10期30-34,共5页China Plastics

摘　　要：通过差示扫描量热仪(DSC)和X射线衍射分别研究了二氧化硅(SiO2)粒子填充等规聚丙烯(iPP)和共聚聚丙烯(co-PP)复合材料的结晶行为和晶体结构。DSC分析结果表明:由于异相成核作用,SiO2粒子提高了iPP的结晶温度,缩短了半结晶期;由于SiO2粒子的表面积大,表面能高,能够将co-PP分子链上的低等规度的链段吸附到填料表面,因而co-PP分子链的运动能力降低,结晶能力下降,导致co-PP的结晶温度大大下降,半结晶期延长。X-射线衍射分析结果表明:SiO2的加入抑制了iPP中β晶的结晶,而对co-PP中各α晶的相对含量影响不大。The crystallization and melting behavior of isotactic polypropylene （iPP） and polypropylene copolymer （co-PP） containing silicon dioxide （SiO2） were investigated using differential scanning calorimeter （DSC） and X-ray diffraction. SiO2 had a heterogenous nucleating effect on iPP, leading to a moderate increase in the crystallization temperature and a decrease in the half crystallization time. Because of the large surface area and high surface free energy, SiO2 particles are able to absorb the short segments with low isotacticity of co-PP on the surface and thus restrict the mobility of the chains, leading to the decrease of crystallization temperature. It was observed that SiO2 particles inhibited the generation of β form crystal in iPP. However, the relative proportions of various α crystal forms in co-PP were not obviously changed with the addition of SiO2 particles.

关 键 词：等规聚丙烯 共聚聚丙烯 二氧化硅 结晶 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]