自由成型改性淀粉作为一种可持续和可回收的塑料。
Freely Moldable Modified Starch as a Sustainable and Recyclable Plastic.
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
College of Textiles, Zhongyuan University of Technology, Zhengzhou 450007, China.
出版信息
Biomacromolecules. 2021 Jun 14;22(6):2676-2683. doi: 10.1021/acs.biomac.1c00361. Epub 2021 May 27.
Efficiently preparing a starch-based plastic with moisture insensitivity and toughness is a challenge to improve the high-value utilization of polysaccharide resources. Herein, a sustainable, recyclable starch-based plastic was prepared in a facile and eco-friendly way. First, starch acetoacetate (SAA) with different degrees of substitution (DSs) was synthesized by transesterification. Then, the SAA film was obtained through a solvent-free hot-pressing method. Notably, SAA with different DSs exhibited various glass transition temperatures (109-140 °C), and SAA with high DS (>0.84) was insoluble even after boiling in water for 1 h. Also, the maximum fracture strength of SAA film up to 15.5 MPa and a maximum elongation at break up to 30% were reached . In addition, the starch-based plastic film retained the original mechanical properties after three cycles of hot processing. In consideration of the facile preparation process, this protocol provided a new avenue for developing sustainable and recyclable starch-based plastics.
高效制备具有抗湿性和韧性的淀粉基塑料是提高多糖资源高值化利用的挑战。在此，我们以简便、环保的方式制备了一种可持续、可回收的淀粉基塑料。首先，通过酯交换反应合成了不同取代度（DS）的淀粉乙酰乙酸酯（SAA）。然后，通过无溶剂热压法得到 SAA 薄膜。值得注意的是，不同 DS 的 SAA 表现出不同的玻璃化转变温度（109-140°C），而 DS 较高（>0.84）的 SAA 即使在沸水中煮沸 1 小时后也不溶解。此外，SAA 薄膜的最大断裂强度可达 15.5 MPa，最大断裂伸长率可达 30%。此外，该淀粉基塑料薄膜在经过三次热加工循环后仍保留了原有的机械性能。鉴于其简便的制备工艺，该方案为开发可持续、可回收的淀粉基塑料提供了新途径。
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