分子量对β-PP/纳米CaCO_3复合物冲击强度的影响  

The Influence of Molecular Weight of PP Matrix on Thermal Behavior and Impact Strength of β-PP/Nano-CaCO_3 Composites

作　　者：许林利[1,2] 许凯[1] 朱林华[1,2] 陈嘉[1,2] 刘欢[1,2] 陈鸣才[1] 

机构地区：[1]中国科学院广州化学研究所,广东广州510650 [2]中国科学院研究生院,北京100039

出　　处：《高分子材料科学与工程》2010年第1期58-61,共4页Polymer Materials Science & Engineering

摘　　要：采用差示扫描量热(DSC)、冲击试验和扫描电镜研究了不同分子量β晶型聚丙烯(β-PP)/纳米CaCO_3复合物在不同成核剂含量下的晶体含量和冲击强度。结果表明,随着成核剂含量的升高,不同分子量的复合物样品的冲击强度都呈先上升后下降的趋势,在0.1%(质量分数,下同)时都出现峰值,由低分子量PP为基体的样品冲击强度从3.5 kJ/m^2上升至9.1 kJ/m^2,提高幅度达160%,由高分子量PP为基体的样品从8.2 kJ/m^2上升至41.3 kJ/m^2,提高幅度达500%。β晶体含量对复合物冲击强度的贡献不大,但明显取决于PP的分子量及β晶体的形态。The effects of β-nucleating agent content on the impact strength were studied for β-phase in isotactic polypropylene （β-PP）/nano-CaCO3 with different molecular weight. There were characterized by differential scanning calorimetry （DSC）, impact testing and scanning electron microscope （SEM）. With increasing the β- nucleating agent content, the impact strength of the samples were increased firstly and then had a downward trend in 0.1% when there were the peak values. The samples with low molecular weight PP matrix increased from 3.5 kJ/ m^2 to 9.1 kJ/m^2, reaching 160%. The samples with high molecular weight PP matrix increased from 8.2 kJ/m^2 to 41.3 kJ/m^2, reaching 500%. The influence of β-crystal content on the impact strength is not obvious, but the morphology of β-crystal and the molecular weight and distribution have an important.

关 键 词：聚丙烯 β-成核剂 纳米碳酸钙 冲击强度 

分 类 号：TB383[一般工业技术—材料科学与工程]