酸酐化LLDPE/PS增容母料对PLA/LLDPE/PS共混物性能的影响  

Effect of Maleated LLDPE/PS Compatibilized Master Batch on Properties of PLA/LLDPE/PS Blends

作　　者：黎官羽 何松迪 陈佳敏 缪培峰 徐建平 Guanyu Li;Songdi He;Jiamin Chen;Peifeng Miao;Jianping Xu(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Peida Plastic Co.,Ltd,Zhangjiagang 215600,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164 [2]江苏培达塑料有限公司,江苏张家港215600

出　　处：《高分子材料科学与工程》2024年第2期83-90,共8页Polymer Materials Science & Engineering

基　　金：江苏省研究生科研与实践创新计划(KYCX22-3030)。

摘　　要：在聚乳酸(PLA)/聚苯乙烯(PS)/线型低密度聚乙烯(LLDPE)(质量比40:30:30)共混物中加入酸酐化LLDPE/PS(质量比50:50)增容母料,考察增容母料用量对共混物力学性能、热性能、动态流变性能、微观形貌和孔径分布的影响。红外分析表明,共混体系加入酸酐化增容母料后有(LLDPE-g-PS)-g-PLA接枝共聚物生成;力学性能测试表明,在加入质量分数10%的增容母料后,相较于简单共混物,其拉伸强度提高了160.5%,断裂伸长率提高了184%,继续增大增容母料用量,力学性能提升并不明显;热性能分析表明,共混物中的PLA相结晶规整度提高,加入10%增容母料后,PLA的熔点(Tm)上升了2.03℃,LLDPE的结晶温度(TC)上升了1.23℃;动态流变测试结果表明,随着增容母料用量的增大,共混物的储能模量(G')、损耗模量(G'')和复数黏度(η*)均有上升,损耗因子(tanδ)下降;扫描电镜分析表明,加入增容母料使共混物相分散均匀、相尺寸减小;压汞仪测试表明,共混物经正庚烷、环己烷抽提后,遗留的“PLA”形成了分级多孔结构,增容母料的加入,使“PLA”孔径缩小,比表面积增大。The maleated LLDPE/PS(50:50,mass ratio)compatibilized master batch was added into the PLA/LLDPE/PS(40:30:30,mass ratio)ternary blend,the effects of amount of the master batch to the mechanical properties,thermal properties,dynamic rheological properties,microstructure and pore size distribution of the blends were investigated.The results of FT-IR analysis show that(LLDPE-g-PS)-g-PLA was formed in the mixing-system with the master batch added.The mechanical property tests show that when 10%(mass fraction)the master batch was added,the tensile strength and elongation at break of the blends are increased by 160.5%and 184%,respectively,compared with the simple blend.However,when the amount of the master batch is increased further,there is no significant improvement in the mechanical properties.The thermal property tests show that adding the master batch could improve the crystallization regularity of PLA in the blends.When 10%(mass fraction)the master batch was added,the melting point(Tm)of the PLA is increased by 2.03℃,and the crystallization temperature(TC)of LLDPE is increased by 1.23℃.The results of dynamic rheological tests show that with the increase of amount of the master batch,the storage modulus(G'),loss modulus(G'')and complex viscosity(η*)of the blends all increase,and the loss factor(tanδ)decreases.The SEM tests show that adding the master batch makes the blend phase disperse evenly,and the phase size decrease.The mercury intrusion porosity tests reveal that the“PLA”remains of the blends after extracted with n-heptane and cyclohexane form a hierarchical porous structure,its pore size is reduced and specific surface area is increased with the addition of the master batch.

关 键 词：聚乳酸 共混物 相容化 分级多孔结构 

分 类 号：TB332[一般工业技术—材料科学与工程]