摘要
通过熔融共混法制备聚乳酸(PLA)与硼酸锌(ZnBO_(3))复合材料,利用超临界二氧化碳釜压发泡和成型机分别制备了PLA/ZnBO_(3)膨胀珠粒与泡沫板材。采用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)和万能试验机,研究了ZnBO_(3)含量对PLA发泡行为以及力学性能的影响。结果表明,PLA基体中ZnBO_(3)的加入,可以提高PLA的发泡能力与结晶度,改善PLA的泡孔形态。实验表明,当ZnBO_(3)质量分数为0.5%时,泡孔形貌最佳,泡孔尺寸为77μm,堆积密度为0.08 g/cm^(3),发泡倍率为16倍,泡孔密度为5.4×10^(7)个/cm^(3),PLA泡沫板材的压缩模量可达1.5 GPa。当ZnBO_(3)质量分数增加为0.7%时,堆积密度降低至0.06 g/cm^(3),发泡倍率高达21倍,泡孔密度提高至8.92×10^(7)个/cm^(3),泡沫板材压缩模量下降为1.2 GPa。因而,通过调控硼酸锌的量可实现调节聚乳酸发泡材料的物理性质与性能。
Poly(lactic acid)(PLA)/zinc borate(ZnBO_(3))expanded bead and foam sheet were prepared by melt blending of PLA and ZnBO_(3)composite materials by supercritical carbon dioxide(CO_(2))foaming and steam chest molding,respectively.The effects of ZnBO_(3)contents on the foaming behavior and mechanical properties of PLA were studied by scanning electron microscope(SEM),differential scanning calorimeter(DSC)and universal testing machine.The results show that the addition of ZnBO_(3)in PLA matrix can effectively improve the ability of foaming of PLA,improve the crystallization ability of PLA,and significantly improve the cell morphology of PLA.When the content of ZnBO_(3)is 0.5%,the cell morphology is the best,the cell size is 77μm,the bulk density is 0.08 g/cm^(3),the foaming ratio is 16 times and the cell density is 5.4×10^(7)cells/cm^(3).Moreover,the compression modulus of PLA foam sheets can reach 1.5 GPa.When the ZnBO_(3)content increases to 0.7%,the bulk density is reduced to 0.06 g/cm^(3),the foam ratio changes to 21 times,the cell density increases to 8.92×10^(7)cells/cm^(3),and the compression modulus of foam sheet decreases to 1.2 GPa.Therefore,the physical properties and properties of PLA foaming materials can be adjusted by adjusting the amount of zinc borate.
作者
曾佳
吴加俊
叶明
刘缓缓
郑广通
倪忠斌
陈明清
ZENG Jia;WU Jiajun;YE Ming;LIU Huanhuan;ZHENG Guangtong;NI Zhongbin;CHEN Mingqing(School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China;Wuxi Hi-Tec Environmental Material Co.,Ltd.,Wuxi 214000,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2022年第11期161-166,共6页
China Plastics Industry
关键词
聚乳酸
硼酸锌
发泡材料
超临界流体
Polylactic Acid
Zinc Borate
Foaming Material
Supercritical Fluid
作者简介
曾佳,男,1987年生,博士研究生在读,主要从事超临界二氧化碳发泡技术方面工作。zengjia@wxhuitong.com.cn;通信作者:陈明清,男,1962年生,博士生导师,主要从事生物可降解高分子、高分子成型加工等方向研究。mqchen@jiangnan.edu.cn。
