共聚单体含量与聚乙烯性能的关系  

Relationship Between Comonomer Content and Polyethylene Properties

作　　者：邸麟婷 秦晨元 魏福庆[1] 杨世元[1] 许惠芳[1] DI Lin-ting;QIN Chen-yuan;WEI Fu-qing;YANG Shi-yuan;XU Hui-fang(Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China)

机构地区：[1]中国石油天然气股份有限公司兰州化工研究中心,甘肃兰州730060

出　　处：《塑料科技》2024年第3期82-86,共5页Plastics Science and Technology

摘　　要：聚乙烯结构是影响聚乙烯性能的关键因素。对于高密度以及线型低密度聚乙烯,不同共聚单体以及共聚单体含量都是影响聚乙烯分子链段产生不同程度支化的重要因素,从长链支化(LCB)的形成看,随着共聚单体含量的增加,LCB的程度往往会减少。文章通过测试三种国内厂家生产的高密度聚乙烯D6095H、L6095-2、L6095-2的共聚单体含量、分子量分布、热性能、力学性能以及微观内部结构等一些基础性能测试,对不同共聚单体含量的高密度聚乙烯进行综合分析。结果表明:共聚单体含量略高的D6095H,熔体流动速率、支化度均高于L6095-1、L6095-2,结晶度低于L6095-1、L6095-2。D6095H的分子量分布大于L6095-1、L6095-2,D6095H的拉伸应力高于L6095-1、L6095-2,而L6095-1、L6095-2有更高的冲击强度。Structure of polyethylene is the key factor affecting the properties of polyethylene.For high-density and linear low-density polyethylene,the choice of different comonomers and their content is crucial in determining the degree of branching in the polymer chains.In the formation of long-chain branching(LCB),an increase in comonomer content often leads to a decrease in the degree of LCB.This study conducted a comprehensive analysis of high-density polyethylene samples,namely D6095H,L6095-1,and L6095-2,produced by three domestic manufacturers.Various fundamental properties such as comonomer content,molecular weight distribution,thermal performance,mechanical properties,and microstructure were tested with respect to different comonomer contents.The results show that D6095H,with a slightly higher comonomer content,exhibits higher melt flow rate and branching degree compared to L6095-1 and L6095-2,but lower crystallinity.D6095H also has a broader molecular weight distribution,higher tensile stress than L6095-1 and L6095-2,while L6095-1 and L6095-2 exhibit higher impact strength.

关 键 词：共聚单体 高密度聚乙烯 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]