聚乳酸/塑化聚乙烯醇合金开孔发泡行为研究

›› 2023, Vol. 37 ›› Issue (4): 79-85.

聚乳酸/塑化聚乙烯醇合金开孔发泡行为研究

孙晓红¹,卫欣怡²

1. 北京工商大学人工智能学院
2. 北京工商大学化学与材料工程学院

收稿日期:2022-12-08 修回日期:2022-12-29 出版日期:2023-04-26 发布日期:2023-04-26

Study on open-cell foaming behaviors of poly（lactic acid）/plasticized poly（vinyl alcohol） blends

Received:2022-12-08 Revised:2022-12-29 Online:2023-04-26 Published:2023-04-26

摘要/Abstract

摘要： 以聚乳酸（PLA）为基体，加入不同含量的塑化聚乙烯醇（CPVA），通过熔融共混法制备PLA/CPVA合金样品。以超临界CO2为物理发泡剂，采用釜压发泡和粒子沥滤法成功制备出PLA/CPVA合金开孔泡沫。结果表明，随着CPVA含量的增加，PLA的结晶温度下降，结晶度先上升后下降，熔体黏弹性改善；随着CPVA含量的上升，PLA/CPVA合金开孔泡沫的发泡倍率先减小后逐渐增大，开孔率逐步提高；当CPVA含量为50 %（质量分数，下同）时，PLA/CPVA合金开孔泡沫的发泡倍率为23.1倍，开孔率达到了91.6 %。

关键词: 聚乳酸, 聚乙烯醇, 超临界二氧化碳, 合金, 开孔泡沫

Abstract: A series of poly（lactic acid）（PLA）/plasticized poly（vinyl alcohol）（CPVA） blends were prepared through melt mixing at different mass ratios of PLA to CPVA， and PLA/CPVA open-cell foams were prepared by using batch foaming and particle leaching methods with supercritical CO2 as a physical foaming agent. The results indicated that the crystallization temperature of PLA decreased significantly with an increase in the CPVA content， and its crystallinity increased at first and then decreased. Moreover， the melt viscoelasticity of the blends was improved. The volume expansion ratio （VER） of the open-cell foams decreased at first and then gradually increased with an increase in the CPVA content. Their open-cell content also increased. When the CPVA content reached 50 wt%， the VER of the open-cell foams was 23.1 times and their open-cell content reached 91.6 %.

Key words: poly（lactic acid）, poly（vinyl alcohol）, supercritical CO2, blends, open-cell foam

孙晓红卫欣怡. 聚乳酸/塑化聚乙烯醇合金开孔发泡行为研究[J]. , 2023, 37(4): 79-85.

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