PBAT/PLLA/PDLA共混材料的结晶性能和耐热性能研究  

Crystallization and heat resistance of PBAT/PLLA/PDLA blends

作　　者：童敏杰 马博谋 刘贵 王学利 俞建勇[1,2] TONG Minjie;MA Bomou;LIU Gui;WANG Xueli;YU Jianyong(College of Textiles,Donghua University,Shanghai 201620,China;Innovation Center for Textile Science and Technology,Donghua University,Shanghai 201620,China;Fujian Fiber Inspection Center,Fuzhou 350008,Fujian,China)

机构地区：[1]东华大学纺织学院,上海201620 [2]东华大学纺织科技创新中心,上海201620 [3]福建省纤维检验中心,福州福建350008

出　　处：《东华大学学报（自然科学版）》2023年第6期43-52,共10页Journal of Donghua University(Natural Science)

基　　金：福建省工业引导性(重点)项目(2021H0037)。

摘　　要：为研究PBAT(poly (butylene adipate-co-terephthalate))添加量和结晶条件对PLLA/PDLA共混材料结晶性能和材料耐热性能的影响,采用熔融共混的方法以不同添加量的PBAT制备PBAT/PLLA/PDLA共混材料,用差示扫描量热仪分析共混材料在不同结晶条件下的半结晶时间(t_(1/2))和结晶度,利用维卡软化温度(VST)测量仪研究共混材料的耐热性能。结果表明:在100℃的结晶温度下,PBAT的加入使PLLA/PDLA共混材料的t_(1/2)由1.0 min降低到0.8 min;在220℃条件下结晶后,PLLA/PDLA共混材料的立构复合程度(f_(sc))为100%,立构复合结晶度(X_(c, S))为31.1%,VST为204℃,但在加入添加量为12%的PBAT后,共混材料的f_(sc)、X_(c, S)和VST均有所降低,分别为96%、15.4%和194℃。高温处理可以提高PLLA/PDLA共混材料的X_(c, S),改善材料耐热性能;添加PBAT可以提高共混材料的结晶速率,但会降低材料耐热性能。The effect of PBAT(poly(butylene adipate-co-terephthalate))content and crystallization temperature on the crystallization and heat resistance of PLLA/PDLA blends are studied.The PBAT/PLLA/PDLA blends with different PBAT content were prepared by melt blending.Then,differential scanning calorimetry(DSC)and Vicat softening temperature(VST)were used to investigate the semi-crystallization time(t_(1/2)),crystallinity and heat resistant of the blends.The results show that the incorporation of PBAT is benefit to the rate of crystallization and t_(1/2)of the blends can be reduced from 1.0 min to 0.8 min at 100℃.After annealing at 220℃,the degree of stereo-complex(f_(sc)),stereo-complex crystallinity(X_(c,S))and VST of PLLA/PDLA blends reaches up to 100.0%,31.1%and 204℃,respectively.The values of the former parameters reduce to 96.0%,15.4%and 194℃after incorporating 12%PBAT.It concludes that the crystallization under high temperature contributes to the improvement of X_(c,S)and heat resistance.The incorporation of PBAT into PLLA/PDLA promotes the crystallization rate,while it reduces the heat resistance of the blends.

关 键 词：聚乳酸 立构复合 结晶性能 聚己二酸-对苯二甲酸丁二醇酯 耐热性能 

分 类 号：TB33[一般工业技术—材料科学与工程]