低剂量电子束辐射改性线性低密度乙烯/三元共聚聚丙烯及其性能  

Effects of low-dose electron beam irradiation on linear low density polyethylene/ternary copolymer polypropylene polyolefin structure and properties

作　　者：张茂江 吴彦甫 崔渴欣 张馨葳 王京华 董春雷 甘杰 吴国忠[2] ZHANG Maojiang;WU Yanfu;CUI Kexin;ZHANG Xinwei;WANG Jinghua;DONG Chunlei;GAN Jie;WU Guozhong(Chizhou University,Chizhou 247000,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]池州学院,池州247000 [2]中国科学院上海应用物理研究所,上海201800 [3]南京信息工程大学,南京210044

出　　处：《辐射研究与辐射工艺学报》2024年第4期32-42,共11页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金项目(22206016);池州学院人才引进基金(2020YJRC001、2020YJRC002);校企合作基金项目(2021HX0015)资助。

摘　　要：本文探究了低剂量电子束辐照对线性低密度聚乙烯(LLDPE)、三元共聚聚丙烯(co-PP)及共混体系的结构-性能影响。研究了吸收剂量对不同比例LLDPE与co-PP共混聚烯烃的流变性能、结晶行为、晶体结构、力学性能的影响。结果表明:当LLDPE∶co-PP为3∶1和1∶1时,共混聚烯烃随着吸收剂量增加,熔融指数降低,支化程度增加,当LLDPE∶co-PP为1∶3,支化程度随吸收剂量增加而降低。聚烯烃的晶体结构和结晶行为受吸收剂量的影响不明显,但不同比例共混后LLDPE与co-PP结晶相互影响。当LLDPE与co-PP添加比例为1∶1时,吸收剂量大于2 kGy时断裂伸长率大于890%,拉伸强度大于25.4 MPa,高于LLDPE和co-PP,同时应力-应变曲线说明辐射改善了LLDPE与co-PP相容性。本文LLDPE/co-PP的低剂量辐照为聚烯烃产品开发提供了新思路。This study investigated the impact of low-dose electron beam irradiation on the structure-property correlation of linear low-density polyethylene(LLDPE),ternary copolymer polypropylene(co-PP),and their blends.Effects of the absorbed dose on the rheological properties,strength,crystallization behavior,crystal structure,and mechanical properties of LLDPE/co-PP blended polyolefins with various blending ratios were examined.The melt index test results indicate that,for LLDPE:co-PP ratios of 3∶1 and 1∶1,the melt index of each prepared polyolefin decreases and its crosslinking degree increases as the absorbed dose increases.However,for a LLDPE:co-PP ratio of 1∶3,the crosslinking degree of the polyolefin decreased with increasing absorbed dose.The crystal structure and crystallization behavior of the polyolefins were minimally affected by their absorbed doses,however,varying the ratios of blended LLDPE and co-PP affected the crystallization of both LLDPE and co-PP.For a blend with 1:1 ratio,an absorbed dose greater than 2 kGy resulted in a sample elongation at break exceeding 890% and a fracture strength of 25.4 MPa those of both LLDPE and co-PP.Additionally,the stress-strain curves of the prepared polyolefins indicated that the absorbed dose enhanced the compatibility between LLDPE and co-PP.Thus,low-dose irradiation of LLDPE/co-PP polyolefins would offer a new avenue of research on polyolefin product development.

关 键 词：共聚聚丙烯 线性低密度聚乙烯 辐射改性 低吸收剂量 

分 类 号：TL13[核科学技术—核能科学]