加速紫外老化对聚乙烯薄膜力学性能的影响  

Effect of Accelerated Ultraviolet Aging on Mechanical Properties of Polyethylene Film

作　　者：姚培培[1] 李琛[1,2] 

机构地区：[1]东北林业大学,黑龙江哈尔滨150040 [2]黑龙江省森林持续经营与微生物工程重点实验室,黑龙江哈尔滨150040

出　　处：《塑料科技》2013年第5期66-70,共5页Plastics Science and Technology

基　　金：黑龙江省自然科学基金项目(C201005);中央高校基本科研业务费专项资金资助(DL12BB16)

摘　　要：介绍了聚乙烯(PE)薄膜老化机理,并对PE薄膜进行了人工加速紫外光老化试验。分析了老化时间对PE薄膜力学性能的影响。结果表明:紫外光的照射使PE的化学键发生交联和断裂反应,其中断裂反应占主导,使聚合物分子量减小,物理性能下降;PE薄膜的拉伸强度、断裂伸长率和弹性模量随老化时间的延长而降低;PE薄膜抵抗破坏的能力在老化60 h以上会急剧下降,而此时弹性模量的变化趋势变得平缓,断裂伸长率与老化时间近似成线性关系递减。The aging principle of polyethylene(PE) film was introduced,and the accelerated ultraviolet aging experiments of PE film were carried on.Setting the cycle way of ultraviolet irradiation and gel and spray,in order to test the changes of the mechanical properties of PE film before and after the aging test,and also define the influence on the PE properties as the aging time extended.The results show that: the PE chemical bond triggers cross linking and cleavage reaction under the ultraviolet irradiation,cleavage reaction occupies a predominant position to lead to polymer molecular weight decrease.The tensile strength and breaking elongation rate and elastic modulus of PE film all reduce with the aging time extended.The force to resist destruction of PE film occur to decline sharply after aging 60 hours,at the same time the elastic modulus trends to slow down,the breaking elongation rate is nearly linear as the ageing time to decrease.

关 键 词：加速紫外老化 力学性能 聚乙烯薄膜 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]