低剂量γ辐照微交联结构对不同支链长度线性低密度聚乙烯的流变性能影响  

Effect of Micro-Crosslinking Structure of Low Dose γ-Irradiation on Rheological Properties of Linear Low-Density Polyethylene with Different Branch Chain Lengths

作　　者：雷亨 毛选之 张帆 张茂江 邢哲[2] 吴国忠[1,2] LEI Heng;MAO Xuan-zhi;ZHANG Fan;ZHANG Mao-jiang;XING Zhe;WU Guo-zhong(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Chizhou University,Chizhou 247100,China)

机构地区：[1]上海科技大学物质科学与技术学院,上海201210 [2]中国科学院上海应用物理研究所,上海201800 [3]中国科学院大学,北京100049 [4]池州学院,安徽池州247100

出　　处：《塑料科技》2024年第11期100-104,共5页Plastics Science and Technology

基　　金：国家自然科学基金项目(22176194);国家自然科学基金项目(22206016)。

摘　　要：为了在不影响吹膜、流延、挤出等工艺的前提下提升聚乙烯(PE)制品性能,通过低剂量γ射线辐照线性低密度聚乙烯(LLDPE)实现材料的微交联,探究低吸收剂量和退火温度对3种不同支链长度LLDPE(牌号:2045G、2645G和7042)的微交联结构和流变行为的影响。结果表明:3种LLDPE的储能模量和复数黏度均随吸收剂量增加而增加,损耗因子却降低,同时退火温度对流变参数无明显影响。当吸收剂量为5 kGy时,7042、2645G和2045G的储能模量分别增加815%、580%和388%,说明LLDPE支链长度越短,其微交联程度越高。结果表明,低剂量辐照可使LLDPE发生微交联,有效提升其流变性能和熔体强度,凸显了通过低剂量辐照微交联改性聚烯烃产品的潜力。In order to improve the performance of polyethylene(PE)products without changing the existing process of film blowing,casting,extrusion,low doseγirradiation was carried out to realize the micro-crosslinking of linear low-density polyethylene(LLDPE)materials in this work.The effects of low absorbed dose and annealing temperature on the micro-crosslinking structure and rheological behavior of three types of LLDPE with different branch chain lengths(Grades:2045G,2645G and 7042)were investigated.The results showed that the storage modulus and complex viscosity of the three types of LLDPE increased with the increase of absorbed dose,yet the damping factor decreased.The rheological properties of LLDPE were unaffected by the annealing temperature.When the absorbed dose was 5 kGy,the storage modulus of 7042,2645G and 2045G increased by 815%、580%and 388%,respectively,indicating that the shorter the branch chain length of LLDPE,the higher the degree of micro-crosslinking.These results demonstrated that the three types of LLDPE with low absorbed dose formed micro-crosslinking structures,effectively improving their rheological properties and melt strength,highlighting the potential for modifying polyolefin products through micro-crosslinking structure of low dose irradiation.

关 键 词：Γ辐照 低吸收剂量 线性低密度聚乙烯 微交联 流变性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TL13[核科学技术—核能科学]