摘要
采用价格低廉的玉米淀粉为填充剂来改性生物可降解聚己二酸⁃对苯二甲酸丁二酯(PBAT),以降低PBAT价格,拓宽应用领域。首先采用丙三醇对玉米淀粉进行塑化,再采用双螺杆挤出机进行造粒获得热塑性淀粉(TPS)粒料,然后采用双螺杆挤出机和注塑机制备不同比例的PBAT/TPS样条,最后分析论文TPS含量对样条结构和力学性能的影响。结果表明,经丙三醇塑化后的淀粉含有大量的羟基,PBAT的结晶结构与PBT的相同,随着TPS含量的增加,PBAT的结晶完善程度逐渐降低,结晶温度向高温方向偏移,拉伸强度和断裂伸长率逐渐降低,而弹性模量有相反的趋势。
As a biodegradable thermoplastic,PBAT has some application limitations due to its high price.In this study,the low⁃cost corn starch was used as a filler to modify PBAT.The corn starch was first plasticized with glycerol and then extruded with a twin⁃screw extruder to obtain the thermoplastic corn(TPS)granules.PBAT/TPS composites were pre⁃pared at different ratios by melt blending,and the effect of TPS content on their structure and mechanical property was in⁃vestigated.The results indicated that there were a large number of hydroxyl groups formed in the starch after plasticized with glycerol.PBAT exhibited the same crystalline structure with PBT.In the PBAT/TPS composites,the PBAT do⁃main showed a gradual decrease in the level of crystallization perfection with an increase of TPS content,and meanwhile its crystallization temperature shifted to a high temperature.As the TPS content increased,the tensile strength and elon⁃gation at break of the composites decreased gradually but their elastic modulus tended to increase.
作者
田银彩
董安旺
TIAN Yincai;DONG Anwang(Department of Material and Chemical Engineering,Henan Institute of Engineering,Zhengzhou 450007,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2020年第9期33-37,共5页
China Plastics
