School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China.
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China.
Int J Biol Macromol. 2023 Jun 15;240:124452. doi: 10.1016/j.ijbiomac.2023.124452. Epub 2023 Apr 15.
In this work, the starch/polybutylene adipate terephthalate (PBAT) composite films with high starch content were prepared by hot-pressing and ultraviolet cross-linking methods using cassava starch, benzophenone (BP), degradable PBAT and citric acid as film-forming substrate, photosensitizer, toughening material and solvent, respectively. The results showed that starch and PBAT had excellent performance, resulting in the composites films exhibit robust tensile strength (9.90 MPa), decent elongation at break (500.05 %) and excellent shape memory property. Under 30 % pre-tensile strain, the shape memory fixity and recovery ratios reached 96.58 % and 93.94 %, respectively. In addition, the starch-based films were successfully rendered hydrophobic by PBAT hydrophobic characteristics. PBAT not only secures the biodegradability of the starch/PBAT composites films, but also improves the mechanical properties of them, and meets the requirements of the thermal shrinkage films when subjected to large strain.
在这项工作中，采用热压和紫外交联方法，以木薯淀粉、二苯甲酮（BP）、可生物降解的聚丁二酸丁二醇酯（PBAT）和柠檬酸分别作为成膜基底、光敏剂、增韧材料和溶剂，制备了高淀粉含量的淀粉/PBAT 复合膜。结果表明，淀粉和 PBAT 具有优异的性能，使复合材料薄膜具有较高的拉伸强度（9.90 MPa）、较好的断裂伸长率（500.05%）和良好的形状记忆性能。在 30%的预拉伸应变下，形状记忆固定率和回复率分别达到 96.58%和 93.94%。此外，基于淀粉的薄膜通过 PBAT 的疏水性特征成功地变得疏水。PBAT 不仅确保了淀粉/PBAT 复合材料薄膜的生物降解性，而且提高了它们的力学性能，并且在经受大应变时满足热收缩薄膜的要求。
