改性热塑性淀粉的制备及其与PBAT复合薄膜的性能

Preparation of modified thermoplastic starch and properties of its composite films with PBAT

利用十六烷基三甲氧基硅烷(HDTMS)对淀粉进行偶联改性后,通过熔融挤出得到热塑性淀粉(TPS),并将其与聚己二酸/对苯二甲酸丁二醇酯(PBAT)复配后吹膜,制备了PBAT/TPS复合膜材料,并探讨了HDTMS含量与TPS耐热性能、流变性能及PBAT/TPS复合膜疏水性能和力学性能的关系。结果发现,加入HDTMS后TPS加工性能得到改善、淀粉基体耐热性能更高,但增塑剂更易析出;加入1份HDTMS后,PBAT/TPS复合膜材料疏水性能得到改善,接触角提高到113.2°,再继续增加HDTMS含量后,接触角基本保持在104°~106°;PBAT/TPS复合膜材料拉伸强度随HDTMS含量的增加先提高后降低,当HDTMS含量为3份时拉伸强度达10.29 MPa。

After coupling modification of starch with hexadecyltrimethoxysilane(HDTMS),thermoplastic starch(TPS)was obtained through coupling modification with hexadecyltrimethoxysilane(HDTMS)and melt extrusion.The resul⁃tant TPS were subjected to direct blowing process with poly(adipic acid⁃co⁃butylene terephthalate)(PBAT).The rela⁃tionship between the HDTMS content and the heat resistance and rheological properties of TPS and the relationship be⁃tween the hydrophobic property and mechanical performance of PBAT/TPS composite membranes were investigated.The results indicated that the processing properties of TPS were improved with the addition of HDTMS,resulting in bet⁃ter heat resistance but easier separation of the additive.The hydrophobic properties of composite membranes were im⁃proved with the addition of 1 phr HDTMS,and their contact angle increased to 113.2°.The contact angle was kept basi⁃cally at 104°~106°with a continuous increase in the HDTMS content.The tensile strength of the composite membrane increased at first and then decreased with an increase in the HDTMS content.The tensile strength reached 10.29 MPa when 3 phr HDTMS was incorporated.