纤维素-聚丁二酸丁二醇酯复合薄膜的制备

目的利用添加剂改善离子液体溶剂再生纤维素的性能。方法以离子液体为纤维素溶剂,利用柔性聚丁二酸丁二醇酯(PBS)增韧纤维素薄膜,并对复合薄膜的结构进行研究。利用拉伸实验仪和扫描电子显微镜,研究复合薄膜的力学性能及拉伸机理。结果 PBS质量分数为1%时,复合薄膜的拉伸强度和断裂伸长率由纯纤维素的45.6 MPa和7.21%提高到58 MPa和15.6%,分别提高了30.7%和48.2%。结论 PBS是以共混的形式存在于纤维素基体中,它们之间没有化学键作用,PBS的含量显著影响其颗粒的大小和分散状态。低含量下PBS微颗粒均匀分散在纤维素基体内,降低了纤维素分子间氢键的密度,有利于纤维素分子链滑移,增强复合薄膜韧性。

Preparation of Cellulose-poly (Butylene Succinate) Films

The work aims to use additive to improve the properties of cellulose (CE) in ionic liquid solvents. IL was used as CE solvent and flexible poly (PBS) was added to improve the toughness of CE film. The structure of composite film was studied. The mechanical property and stretching mechanism of composite film were researched by tensile tester and SEM. The results showed that when PBS content was 1%, the tensile strength and elongation at break of CE/PBS-1 were increased from 45.6 MPa and 7.21% to 58 MPa and 15.6% respectively, which were increased by 30.7% and 48.2% respectively. In conclusion, the PBS in the CE matrix is in the form of blending and no chemical bonding exists between them. The content of PBS significantly effects on the particle size and decentralized state. Lower content of PBS particles can be uniformly dispersed in CE matrix, which reduces the density of hydrogen bonds between the CE molecules, and is beneficial to the slip of molecular chain. Hence, the toughness of the composite film is enhanced.