乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯共混物的相态结构.pdf

石油化
1336
PETROCHEMICAL TECHNOLOGY
2011年第40卷第12期
石油化工新材料
聚乳酸/线型低密度聚乙烯/乙烯一丙烯酸甲酯
甲基丙烯酸缩水甘油酯共混物的相态结构
苏志忠,林明穗,方丽华,苏雪丽,饶强,王坚荣
(三明学院化学与生物工程系,福建三明365000
[摘要]以乙烯一内烯酸甲酯-甲基丙烯酸缩水甘油酯共聚物(EMAG)为增容剂,制备了聚乳酸(PLA)/线型低密度聚乙烯
(LDPE)/EMAG的共混物。采用SEM,DSC,WAXD等手段对 PLA/LLDPE/EMAG共混物进行了表征。表征结果显示,共混物
中的EMAG起到了增容作用,使 PLA/LLDPE/EMAG共混物的结晶能力减弱,分散相 LLDPE在基体PLA中的粒径明显减小。
Harkin's销展系数法计算结果表明,EMAG可在 LLDPE中扩散并完全包覆LDPE。实验结果表明, PLA/LL DPE./EMAG共混物
的仲长率和冲击强度均随EMAG含量的增加而提高,m(PLA):m(LDPE):m(EMAG)=81:9:10时的PLA/ LLDPE/EMAG
共混物的伸长率可达227%,冲击强度可达32.0kI/m2,并能保持较高的强度和刚性。
关键词]聚乳酸;线型低密度聚乙烯;乙烯一丙烯酸乙一甲基丙烯酸甘油酯;扩展系数法;共混物
文章编号11000-8144(2011)12-1336-0
[中图分类号TQ316、344
文献标识码」A
Phase Structure of Polylactide/Linear Low Density Polyethylene,
Ethylene-methyl Acrylate-glycidyl Methacrylate Terpolymer Blends
Su Zhizhong, Lin Mingswi, Fang Lihua, Su Xueli, Rao Qian, Wang ianrong
(Chemical and Biological Engineering Department, Sanming University, Sanming Fujian 365000, China)
Abstract] The blends of polylactide(PLA) linear low density polyethylene(LLDPE )and ethylene-
methyl acrylate-glycidyl methacrylate terpolymer(EMAG ) were prepared with EMAG as a compatibilizer
The PLA/LLDPE/EMAG blends were characterized by means of SEM, WAXD and DSC. The results
show that the tendency of PLA to crystallize is reduced, and the domain sizes of LLDPE dispersd in
PLA matrix decrease with the addition of EMAG which indicates that the compatibility between PLA
and LLDPE is improved by EMAG. The spreading coefficient calculations indicate that EMAG spreads
on LLDPE extensively to encapsulate LLDPE completely. The elongation rate and Charpy impact
strength of PLA/LLDPE/EMAG blends increase with increasing EMAG content. When m(PLA)
m(LLDPE) M(EMAG ) is 81: 9: 10, PLA/LLDPE/EMAG blend has elongation rate of 227% and
Charpy impact strength of 32. 0 k]/m, relatively high strength and stiffness
Keywords polylactide; linear low density polyethylene ethylene-methyl acrylate-glycidyl methacrylate
terpolymer; spreading coefficient prediction; blend
聚乳酸(PLA)因其良好的力学性能、生物可降酸丁二酯“?、聚(对苯二.甲酸丁二醇-cー?ニ
解性、化学惰性及可加工性能,已成为最具前途的
生物可降解高分子材料之一。但PLA的脆性、热变[收稿日期!2011-07-20:[修改稿日期】2011-08-2
形温度低、冲击性能差和结晶速率慢等缺陷限制了で作者简介』苏志忠(1967-),男,福建省田市人,博士,教授,电
其在工业领域的应用范面'2。通过共聚和共混改话13159968电邮hho3m
[基金项目]』福建省自然基金项目(201101328);福建省教育厅
性方法可克服PLA的这些缺陷。一些研究者将柔
类重点项目(JA10262);二明学院质量工程项目(10919/Q和
顺性好的生物可降解聚合物如聚己内酯、聚丁二ニzmCs)