摘要
以淀粉和聚乳酸(PLA)为原料、甘油为增塑剂,采用双转子连续混炼挤出机通过熔融共混法制备了PLA/淀粉共混物,研究不同转子转速和甘油含量下,共混物的微观结构、流变性能、结晶性能和力学性能,得到剪切作用及增塑剂含量对共混物两相相容性的影响。对共混物的扫描电镜照片、红外光谱图以及动态频率扫描曲线进行分析。结果表明,适当提高转子转速及甘油含量有利于提高淀粉的塑化程度,改善淀粉与PLA之间的相容性。差示扫描量热分析曲线表明,共混物的结晶度随着甘油含量的提高而降低。当甘油质量分数为20%、转速为300 r/min时,淀粉分散相与PLA基体的相容性最好,共混物具有良好的力学性能,拉伸强度达到25.1 MPa、弯曲强度达到33.1 MPa。
Polylactic acid(PLA)/starch blends were prepared by melting blending using twin-rotor continuous mixing extruder,with starch and PLA as raw materials and glycerin as plasticizer.The microstructure,rheological properties,crystallinity and mechanical properties of the blends under different rotor speeds and glycerol contents were studied.The effects of shear force and plasticizer content on the two-phase compatibility of the blends were obtained.SEM,FT-IR and dynamic frequency scanning results of the blends were analyzed.The results show that the appropriate increase of rotor speed and glycerol content could improve the plasticization degree of starch and compatibility between starch and PLA.DSC curves show that the crystallinity of the blends decreases with the increase of glycerol content.When the glycerol mass fraction is 20%and rotation speed is 300 r/min,the compatibility between starch dispersed phase and PLA matrix is the best.The blend has good mechanical properties,with the tensile strength of 25.1 MPa and bending strength of 33.1 MPa.
作者
万舟
黄倩玙
倪辉
朱惠豪
马玉录
谢林生
Zhou Wan;Qianyu Huang;Hui Ni;Huihao Zhu;Yulu Ma;Linsheng Xie(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
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2023年第2期51-57,65,共8页
Polymer Materials Science & Engineering
关键词
聚乳酸
淀粉
甘油
双转子连续混炼挤出机
相容性
polylactic acid
starch
glycerin
twin-rotor continuous mixing extruder
compatibility
