文献类型：期刊文献

中文题名：PP-g-MAH对聚乳酸流变行为和阻隔性能的影响

英文题名：Effects of PP-g-MAH on Rheological Behavior and Barrier Properties of PLA

作者：李杨 周琴 马智慧 李青 许世光 于华年 易丽艳

第一作者：李杨

机构：[1]贵州理工学院材料与冶金工程学院,贵州贵阳550003;[2]贵州理工学院工程训练中心,贵州贵阳550003

第一机构：贵州理工学院材料与冶金工程学院

年份：2018

卷号：46

期号：7

起止页码：81-85

中文期刊名：塑料科技

外文期刊名：Plastics Science and Technology

收录：CSTPCD;;北大核心:【北大核心2017】；

基金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]225);贵州理工学院大学生创新创业项目

语种：中文

中文关键词：聚乳酸;马来酸酐接枝聚丙烯;动态流变;阻隔性能

外文关键词：PLA;PP-g-MAH;Dynamic rheological;Barrier properties

摘要：采用双螺杆熔融共混法制备了聚乳酸/马来酸酐接枝聚丙烯（PLA/PP-g-MAH）共混复合材料,研究了PP-gMAH对PLA流变行为及气体阻隔性的影响。动态流变研究结果表明：随着PP-g-MAH用量的增加,PLA/PP-g-MAH共混体系在线性黏弹区的储能模量逐渐增大,体系的介质损耗（tanδ）峰向低温区移动,表明PP-g-MAH与PLA基体有一定的相容性。共混体系的现行临界应变表现出逐渐减小的趋势,且在第二平台区表现出相同的规律,同时共混体系的损耗模量和储能模量均随着PP-g-MAH用量的增加而增大。此外,PP-gMAH与PLA的界面反应极其微弱,主要以物理缠结为主。共混体系的Cole-Cole曲线表明：高PP-g-MAH用量下,PLA/PP-g-MAH共混体系相分离现象明显,体系的松弛行为显示了一个附加的松弛过程,并向较低的频率延伸。阻隔性能测试结果表明：PLA/PP-g-MAH复合材料的水蒸气及氧气透过系数均随着PP-gMAH含量的增加而减小。在实验范围内,添加20%的PP-g-MAH,可使水蒸气、氧气透过系数均达到最小,分别为4.5×10^-15 cm^3·cm/（cm^2·s·Pa）和1.3×10^-10 g/（m·s·Pa）。
Polylactic acid/polypropylene-g-maleic anhydride（PLA/PP-g-MAH） composites were prepared by twin-screw melt blending method. The effects of PP-g-MAH on rheological behavior and gas barrier properties of PLA were studied. The dynamic rheological results show that with the increase of PP-g-MAH content, the storage modulus of PLA/PP-g-MAH blends increases gradually in the linear viscoelastic region, and dielectric loss（tanδ） peak moves to the low temperature region, the phenomenon indicates that PP-g-MAH has a certain compatibility with PLA matrix. The current critical strain of the PLA/PP-g-MAH blend shows a decreasing trend and the same rule in the second platform region. The loss modulus and storage modulus of the blend improve with the increase of PP-g-MAH content. The interfacial reaction between PP-gMAH and PLA is weak, mainly by physical entanglement. The Cole-Cole curve shows that the phase separation phenomenon of PLA/PP-g-MAH system is obvious under the high PP-g-MAH dosage. The relaxation behavior of the blend system shows an additional relaxation process, and which extends to a lower frequency. The test results of barrier performance show that the permeability coefficients of water vapor and oxygen decrease with the increase of PP-g-MAH content. When PP-g-MAH content is 20%, the permeable coefficients of water vapor and oxygen reach the minimum, which are 4.5×10^-15cm^3·cm/（cm^2·s·Pa） and 1.3×10^-10 g/（m·s·Pa）, respectively.