摘要
采用微纳层叠共挤出设备制备聚乳酸(PLA)/聚己内酯(PCL)可降解微层薄膜,利用扫描电子显微镜、万能材料试验仪、差示扫描量热仪和热失重分析仪等对微层薄膜的微观结构、力学性能和热稳定性进行表征。结果表明,PLA/PCL微层薄膜的热稳定性和力学性能均优于PLA/PCL共混薄膜;PCL对微层薄膜具有明显的增韧效果,同时可提高微层薄膜的结晶性能和热稳定性;当PLA/PCL配比为40/60、50/50或60/40时,PLA/PCL微层薄膜具有良好的综合性能,此时拉伸强度高于51.2 MPa,断裂伸长率高于568.6%,冲击强度高于100.7 J/m,微层薄膜中PLA相的结晶度高于43.28%、热降解峰值温度高于373.22℃。
Poly(lactic acid)(PLA)/polycaprolactone(PCL)biodegradable multilayered films were prepared through a micro⁃nano layer multiplier coextrusion equipment,and their microstructure,mechanical properties and thermal stability were characterized by scanning electron microscopy,tensile and impact measurements,differential scanning calorimetry,and thermogravimetric analysis.The results indicated that the multilayered films exhibited better thermal stability and mechanical properties than the PLA/PCL blend films.PCL showed a significant toughening effect on the multilayered films,improving their crystallinity and thermal stability.When the PLA/PCL ratio was set as 40/60,50/50 or 60/40,the multilayered films achieved good comprehensive properties with tensile strength of over 51.2 MPa,elongation at break of over 568.6%,impact strength of over 100.7 J/m,PLA crystallinity of over 43.28%,and thermal degrada⁃tion peak temperature of over 373.22℃.
作者
谷琳
朱钰婷
何家隆
朱惠豪
马玉录
谢林生
GU Lin;ZHU Yuting;HE Jialong;ZHU Huihao;MA Yulu;XIE Linsheng(Engineering Center of Efficient Green Process Equipment and Energy Conservation of Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2021年第11期7-14,共8页
China Plastics
关键词
聚乳酸
聚己内酯
微纳层叠共挤出设备
可降解微层薄膜
力学性能
热稳定性
poly(lactic acid)
polycaprolactone
micro⁃nano layer multiplier coextrusion equipment
degradable multilayer film
mechanical property
thermal stability
