中国塑料 ›› 2020, Vol. 34 ›› Issue (9): 33-37.DOI: 10.19491/j.issn.1001-9278.2020.09.006

• 材料与性能 • 上一篇    下一篇

PBAT/热塑性玉米淀粉共混改性对结构和力学性能影响

田银彩(), 董安旺   

  1. 河南工程学院材料与化学工程学院,郑州 450007
  • 收稿日期:2020-03-20 出版日期:2020-09-26 发布日期:2020-09-25

Effect of Blending Modification on Structure and Mechanical Properties of PBAT/Thermoplastic Corn Starch Composites

TIAN Yincai(), DONG Anwang   

  1. Department of Material and Chemical Engineering, Henan Institute of Engineering, Zhengzhou 450007, China
  • Received:2020-03-20 Online:2020-09-26 Published:2020-09-25
  • Contact: TIAN Yincai E-mail:tianyincai@126.com

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。

关键词: 玉米淀粉, 聚己二酸-对苯二甲酸丁二酯, 相容性, 力学性能

Abstract:

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 prepared at different ratios by melt blending, and the effect of TPS content on their structure and mechanical property was investigated. 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 domain 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 elongation at break of the composites decreased gradually but their elastic modulus tended to increase

Key words: corn starch, poly(adipic acid)/butylene terephthalate, compatibility, mechanical property

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