摘要
制备出两种氢调敏感性的不同的催化剂，然后按照不同的比例混合，通过原位聚合法制备了宽峰聚乙烯纳米复合材料，分别表征和测定了其微观结构、分子结构参数和力学性能。结果表明：蒙脱土片层在乙烯聚合过程中发生了插层及剥离，以单片层或几层共存的形式纳米级分散于聚乙烯基体中；聚合物相对分子质量呈宽峰分布（Mw／Mn=7．23）；在熔体流动速率相近的情况下，复合材料的断裂伸长率提高到900％以上，拉伸强度达到40MPa。
Polyethylene with a broad molecular weight distribution was prepared using hybrid catalysts in presence of montmorillonite nanocomposites forming a composite in situ. The exfoliation of the layered silicates in the composites was confirmed by XRD and TEM observation. The broad molecular weight distribution characteristic for the composites was revealed by the GPC profile （Mw/Mn = 7.23）, which was mainly due to different response to hydrogen regulation for active sites generated by hybrid catalysts. The composite gave rise to an elongation at break of 900 % and a tensile strength of 40 MPa.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第4期31-34,共4页
China Plastics
关键词
宽峰聚乙烯
原位聚合
蒙脱土
纳米复合材料
力学性能
broad molecular weight distribution polyethylene
in situ polymerization
montmorillonite
nanocomposite
mechanical property
