摘要
采用超临界二氧化碳(SC-CO_(2))连续挤出发泡方法,研究了纳米柠檬酸锌(NZnC)对聚乳酸(PLA)发泡行为的影响。首先,采用差示扫描量热仪(DSC)、扫描电子显微镜(SEM)和压缩试验机分别研究了纳米柠檬酸锌(NZnC)、食品级柠檬酸锌(FZnC)、纳米二氧化硅(N-SiO_(2))、癸二酸二苯基二酰肼(TMC-300)和滑石粉(Talc)5种成核剂对PLA等温结晶行为、成核剂/PLA复合材料的微观形貌、PLA泡沫发泡性能及压缩性能的影响。结果表明,NZnC的PLA等温结晶速率最快、在PLA中分散性及相容性最佳、PLA泡沫发泡性能及压缩性能改性效果最好。继而,研究了NZnC含量对PLA泡沫发泡性能及压缩性能的影响,其结果表明,NZnC质量分数为0.5%时,PLA泡沫的发泡性能最好(发泡倍率为31倍、泡孔密度为3.02×10^(9) cm^(-3)、平均泡孔直径为17.11μm),压缩性能也最好(压缩模量为19 MPa、压缩强度为0.35 MPa)。
The effects of nano-zinc citrate(NZnC)on the foaming behaviors of polylactic acid(PLA)were investigated in continuous extrusion foaming with supercritical CO_(2)as blowing agent.First,the effects of five nucleating agents(nano zinc citrate(NZnC),food grade zinc citrate(FZnC),nano silica(N-SiO_(2)),diphenyl sebacic acid dihydrazide(TMC-300)and talc)on the isothermal crystallization behavior of PLA,micro-morphologies of nucleating agent/PLA composites,foaming performance and compression performance of PLA foam were studied by differential scanning calorimeter(DSC),scanning electron microscope(SEM)and compression testing machine.The results show that NZnC has the fastest isothermal crystallization rate of PLA,the best dispersibility and compatibility in PLA,and the best modification effect of foaming performance and compression performance of PLA foam.And then,the effects of NZnC content on the foaming performance and compression performance of PLA foam were studied.The results show that when the NZnC mass fraction is 0.5%,the PLA foam has the best foaming performance(the foaming ratio is 31 times,the cell density is 3.02×10^(9)cm^(-3),and the average cell diameter is 17.11μm),and the compression performance is also the best(the compressive modulus is 19 MPa,the compressive strength is 0.35 MPa).
作者
周刚
刘文俊
黄承哲
尹海燕
Gang Zhou;Wenjun Liu;Chengzhe Huang;Haiyan Yin(School of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325000,China;Biomaterials Division,Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou 325001,China;Institute of New Materials&Industry Technology,Wenzhou University,Wenzhou 325299,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2022年第9期103-109,共7页
Polymer Materials Science & Engineering
关键词
聚乳酸
挤出发泡
超临界二氧化碳
成核剂
纳米柠檬酸锌
发泡行为
压缩性能
polylactic acid
extrusion foaming
supercritical carbon dioxide
nucleating agent
nano-zinc citrate
foaming behavior
compression performance
