聚乳酸/聚烯烃弹性体共混体系的发泡行为
Foaming behavior of poly(lactic acid)/polyolefin elastomer blends
徐远 1邵玮玮 2吴王坚 1曾谛 1庞永艳 2郑文革2
作者信息
- 1. 宁波大学材料科学与化学工程学院,浙江宁波 315211;中国科学院宁波材料技术与工程研究所高分子与复合材料实验室,浙江宁波 315201
- 2. 中国科学院宁波材料技术与工程研究所高分子与复合材料实验室,浙江宁波 315201
- 折叠
摘要
为研究聚乳酸(PLA)共混体系的界面相互作用对发泡材料泡孔结构的影响,选择聚烯烃弹性体(POE)和马来酸酐接枝聚烯烃弹性体(POE-g-MAH)分别与PLA共混,制备PLA/POE和PLA/POE-g-MAH共混物,然后利用釜压发泡,制备共混体系发泡材料.首先,利用扫描电子显微镜(SEM)观察了POE和POE-g-MAH在PLA中的分散情况;然后,利用旋转流变仪研究了PLA/POE和PLA/POE-g-MAH共混体系的流变行为;最后,利用SEM研究了PLA/POE和PLA/POE-g-MAH共混体系发泡材料的泡孔结构,通过测试样品发泡前后的密度计算了膨胀倍率,并探讨了界面相互作用对泡孔结构的影响.结果显示,随着弹性体含量增加,POE和POE-g-MAH的相区尺寸都随之增大,后者的相区尺寸较小;POE和POE-g-MAH含量增加,体系的复数黏度和储能模量也都增大,由于后者与PLA的界面相互作用更强,因此其体系复数黏度和储能模量增大得更显著;当弹性体质量分数为10%和20%时,POE的加入可增强体系的气泡异相成核,因此形成的泡孔尺寸较小,而POE-g-MAH的加入有利于泡孔生长,因此形成的泡孔尺寸较大;在90℃发泡后,PLA/POE-g-MAH10和PLA/POE-g-MAH20发泡材料的膨胀倍率比PLA/POE10和PLA/POE20的更大.
Abstract
To study the effect of interfacial interaction of poly(lactic acid)(PLA)blends on cell structure,polyolefin elastomer(POE)and POE grafted with maleic anhydride(POE-g-MAH)were chosen to mix with PLA to prepare PLA/POE and PLA/POE-g-MAH blends,and then the blend foams were prepared via batch foaming process.First,the dispersion of POE and POE-g-MAH in PLA were observed using scanning electron microscope(SEM).Then,the rheological behavior of PLA/POE and PLA/POE-g-MAH blends were studied with rheometer.Last,the cell structure of PLA/POE and PLA/POE-g-MAH blend foams were studied with SEM,the expansion ratio of the foams was obtained via measuring the density before and after foaming,and the effect of inter-facial interaction on cell structure was discussed.The results show that with increase in elastomer content,the phase domains of POE and POE-g-MAH both increase,and the latter has smaller phase domains.With increase in POE and POE-g-MAH content,the complex viscosity and storage modulus of both blends increase.POE-g-MAH has stronger interfacial interaction with PLA,and resultantly,the complex viscosity and storage modulus of the blend increase more significantly.With elastomer content of 10% and 20%,the heterogeneous cell nucleation is enhanced for PLA blends with POE,and hence,the cell size is smaller.The cell growth is facilitated for PLA blends with POE-g-MAH,and hence,the cell size is larger.For foams prepared at 90℃,PLA/POE-g-MAH10 and PLA/POE-g-MAH20 have larger expansion ratio than PLA/POE10 and PLA/POE20.
关键词
聚乳酸/聚烯烃弹性体/马来酸酐接枝聚烯烃弹性体/共混体系/发泡行为Key words
poly(lactic acid)/polyolefin elastomer/polyolefin elastomer grafted with maleic anhydride/blend/foaming behavior引用本文复制引用
基金项目
国家自然科学基金面上项目(52273047)
出版年
2024
NETL
NSTL
万方数据