具有柔性的结晶性聚(L-乳酸)/聚衣康酸丁二醇酯共混薄膜的制备及其力学性能和热学性能
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内蒙古农业大学食品科学与工程学院

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国家自然科学基金项目(21965026);内蒙古自治区科技计划项目(2021GG337)


Preparation and mechanical and thermal properties of flexible crystalline poly(L-lactic acid) /polyitaconic acid butanediol blend films
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    摘要:

    本论文合成了聚衣康酸丁二醇酯共聚物(PBI)并与聚乳酸(PLLA)共混,添加不同比例的PBI制备PLLA/PBI共混薄膜。通过广角X射线衍射仪和差示扫描量热仪测试了薄膜的结晶性能。研究表明,PBI的加入后促进了PLLA晶型的转变,且PLLA的结晶速率加快。采用拉力试验机对薄膜的力学性能进行测试。相比于PLLA薄膜,PLLA/PBI薄膜的柔顺性大幅度提高。当PBI的添加量为15%时,PLLA/PBI薄膜的断裂伸长率达到371.8%。薄膜的结晶度达到33.9%时,薄膜仍具有良好的柔韧性。当PLLA/PBI进行等温结晶后,其强度增加,薄膜具备较好的柔顺性。PBI含量为20%时,PLLA的断裂伸长率仍可达到50%以上。

    Abstract:

    In this paper, polyitaconic acid butanediol ester copolymer (PBI) was synthesized and then blended with polylactic acid (PLLA). The PLLA/PBI blends were prepared by adding different proportions of PBI. The crystallization properties of the films were measured by Wide angle X-ray diffractometer and Differential Scanning Calorimeter. The results showed that the addition of PBI promoted the crystal transformation of PLLA, and the crystallization rate of PLLA was accelerated. Tensile testing machine was used to test the mechanical properties of the film. Compared with PLLA film, the flexibility of PLLA/PBI film was greatly improved. When the amount of PBI was 15%, the elongation at break of PLLA/PBI film reaches 371.8%.When the crystallinity of the film reacheds 33.9%, the film still showed good flexibility. After isothermal crystallization of PLLA/PBI, the strength of PLLA/PBI film increased and the film exhibited good flexibility. When the content of PBI was 20%, the elongation at break of PLLA can still reach more than 50%.

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  • 收稿日期:2021-11-29
  • 最后修改日期:2022-02-21
  • 录用日期:2022-03-28
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