聚醋酸乙烯酯对聚乳酸复合材料发泡性能的影响  

Effect of Polyvinyl Acetate on Foaming Properties of Polylactic Acid Composites

作　　者：欧俊文 黄承哲 刘文俊 Junwen Ou;Chengzhe Huang;WenjunLiu(School of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325000,China;Institute of New Materials&Industry Technology,Wenzhou University,Wenzhou 325299,China)

机构地区：[1]温州大学化学与材料工程学院,浙江温州325000 [2]温州大学新材料与产业技术研究院,浙江温州325299

出　　处：《高分子材料科学与工程》2024年第9期50-56,共7页Polymer Materials Science & Engineering

摘　　要：采用超临界二氧化碳(SC-CO_(2))釜压发泡方法,研究了聚醋酸乙烯酯(PVAc)对聚乳酸(PLA)发泡行为的研究。首先,采用重量法研究了PVAc的重均分子量及其浓度对CO_(2)在PLA中溶解度的影响,PVAc的重均分子量为1×10^(5)、质量分数为1.5%时,CO_(2)在PLA中溶解度最高(14.0%)。然后,采用差示扫描量热仪、毛细管流变仪和扫描电子显微镜研究了PVAc含量对PLA的热学性能、流变性能及PLA泡沫泡孔结构的影响。结果表明,随着PVAc含量的增加,复合材料的结晶性能逐渐提高,其表观黏度逐渐减小,发泡倍率及泡孔密度先增大后减小,当PVAc质量分数为1.5%时,PLA复合材料的发泡性能最佳(泡孔密度为2.56×108 cm^(-3),发泡倍率为74.4倍)。The foaming behavior of polyvinyl acetate(PVAc)on polylactic acid(PLA)was studied by supercritical carbon dioxide(SC-CO_(2))autoclave foaming method.First,the gravimetric method was applied to study the effect of weight-average molecular weight of PVAc on the solubility of CO_(2) in PLA.The results show that when the added amount of PVAc is 1.5%,as the weight-average molecular weight of PVAc increases,the solubility of CO_(2) in PLA decreases.When the average molecular weight is 1×10^(5),CO_(2) has the highest solubility in PLA(14%).Then,differential scanning calorimeter(DSC),capillary rheometer,and scanning electron microscope(SEM)were used to study the effect of the addition of PVAc on the thermal properties,rheological properties,and cell structure of PLA foams.The results show that with the addition of PVAc,the solubility of CO_(2) in the PLA composite material increases significantly during the foaming process,and the foaming ratio first increases and then decreases,the viscosity gradually decreases;when the PVAc addition amount is 1.5%,the foaming performance of the PLA composite material is the best(cell density is 2.56×108 cm^(-3),and the foaming ratio is 74.4 times).

关 键 词：聚乳酸 聚醋酸乙烯酯 超临界二氧化碳 发泡 

分 类 号：TQ328[化学工程—合成树脂塑料工业]