| 聚乳酸/乙烯-醋酸乙烯酯共聚物共混物的形态与黏弹行为 |
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| 引用本文： | 张洁,吴德峰,周卫东,张明.聚乳酸/乙烯-醋酸乙烯酯共聚物共混物的形态与黏弹行为[J].高分子学报,2011(2). |
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| 作者姓名： | 张洁 吴德峰 周卫东 张明 |
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| 作者单位： | 扬州大学化学化工学院;扬州大学江苏省环境工程与环境材料重点实验室;扬州大学测试中心; |
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| 基金项目： | 国家自然科学基金(基金号50803052); 江苏省自然科学基金重点项目(项目号BK2010040); 中国博士后基金(20080441078,200902532)资助 |
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| 摘 要： | 熔融共混制备了不同组分比的聚乳酸(PLA)/乙烯-醋酸乙烯酯共聚物(EVA)共混物,采用扫描电子显微镜(SEM)、溶剂选择性蚀刻和旋转流变仪研究了共混物不相容的相形态及其黏弹响应.研究结果表明,PLA/EVA共混物为典型的热力学不相容体系,两基体组分间的界面张力约为2.2 mN/m;因此随组分比的不同,共混物表现出"海-岛"分散和双连续的不相容相形态;体系中EVA的相反转浓度约为50 wt%～60 wt%,这与黏性模型对相反点预测的结果一致;与双连续相形态的体系相比,乳液模型能够更好的描述具有"海-岛"分散形态的体系的线性黏弹响应,共混体系相对较宽的相反转区域主要源于两组分间较大的弹性比以及EVA自身的屈服行为.
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| 关 键 词： | 聚乳酸 乙烯-醋酸乙烯酯共聚物 共混 形态 黏弹行为 |
MORPHOLOGY AND VISCOELASTIC BEHAVIOR OF POLYLACTIDE/ETHYLENE-VINYL ACETATE COPOLYMER BLENDS |
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| ZHANG Jie,WU Defeng,ZHOU Weidong,ZHANG Ming.MORPHOLOGY AND VISCOELASTIC BEHAVIOR OF POLYLACTIDE/ETHYLENE-VINYL ACETATE COPOLYMER BLENDS[J].Acta Polymerica Sinica,2011(2). |
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| Authors: | ZHANG Jie WU Defeng ZHOU Weidong ZHANG Ming |
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| Institution: | ZHANG Jie1,2,WU Defeng1,ZHOU Weidong3,ZHANG Ming1,2(1 School of Chemistry & Chemical Engineering,2 Provincial Key Laboratory of Environmental Material & Engineering,3 Testing Center,Yangzhou University,Yangzhou 225002) |
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| Abstract: | Polylactide/ethylene vinyl acetate copolymer blends(PLA/EVA) with various blend ratios were prepared by melt mixing.The phase morphology and viscoelastic properties of the blends were then studied using scanning electron microscope(SEM),selective etching and rheometer,respectively.The results show that the PLA/EVA blends are typical thermodynamically immiscible blends with interfacial tension values of about 2.2 mN/m between the two polymers.Hence the blend systems present sea-island and co-continuous morp... |
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| Keywords: | Polylactide Ethylene vinyl acetate copolymer Blend Morphology Viscoelastic behavior |
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