低密度聚乙烯支链分布的表征  

Characterization of Branch Distribution in Low Density Polyethylene by SGEF

作　　者：黄红红[1] 张京春[1] 侯莉萍[1] 魏东[1] 王薇微[1] 郭梅芳[1] 

机构地区：[1]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《塑料》2011年第1期6-7,5,共3页Plastics

摘　　要：采用溶剂梯度淋洗法(SGEF)对一种低密度聚乙烯树脂(LDPE)进行结构分级,级分用于定量表征LDPE的支链分布。结果表明:采用溶剂梯度淋洗法能得到不同分子量且窄分子量分布的级分试样。核磁共振波谱仪(NMR)定量分析级分试样的支链类型和数量,发现大分子量组分含有更多6个碳以上的支链。采用凝胶渗透色谱仪(GPC)定性分析样品的长链支化情况。Low density polyethylene was fractionated by means of solvent-gradient elution fractionation （SGEF）. The fractions had different molecular weight and narrower molecular weight distribution. The branching content in each fraction was given by Carbon-13 nuclear magnetic resonance （NMR）. It was found that the fraction with higher molecular weight contained more 6 ＋C branching. The long branching were analyzed qualitatively by gel permeation chromatography （ GPC）.

关 键 词：低密度聚乙烯 溶剂梯度淋洗 支链分布 凝胶渗透色谱 核磁共振波谱 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]