State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; College of Forestry, Wood Industry and Furniture Engineering Key Laboratory of Sichuan Provincial Department of Education, Sichuan Agricultural University, Chengdu 611130, China.
Carbohydr Polym. 2022 Sep 1;291:119479. doi: 10.1016/j.carbpol.2022.119479. Epub 2022 Apr 26.
The increasing environmental burden generated by disposable plastic wastes makes the development of sustainable substitute materials an emergent task. As one of the most abundant bioresources, chitosan (CS) has been considered as a potential candidate for plastic substitution. Conventionally, CS-based materials are fabricated through a solution-processing procedure due to the high crystallinity of CS. Herein, we designed a CS-based material via integrating CS into the network of polyimine (PI), which shows thermomechanical processability similar to plastics. Strong interactions were achieved through dynamic imine bond and hydrogen bond and thus formed a thermo-processable dynamic composite network. These CS-based plastic substitutes exhibit exceptional mechanical performances, excellent thermal/chemical stability, and a series of self-adaptiveness, including re-healing, reprocessing and multi-layer laminating. Notably, CPs can be easily degraded and 100% recycled for the production of next-generation materials. This work provides an alternative route to produce green and sustainable biomass materials as a plastic substitute.
不断增加的一次性塑料废物给环境带来的负担，使得开发可持续替代材料成为当务之急。壳聚糖（CS）作为最丰富的生物资源之一，已被认为是塑料替代材料的潜在候选物。通常，由于 CS 的高结晶度，基于 CS 的材料是通过溶液处理工艺来制造的。在此，我们通过将 CS 整合到聚酰亚胺（PI）的网络中，设计了一种基于 CS 的材料，该材料表现出与塑料相似的热机械加工性能。通过动态亚胺键和氢键实现强相互作用，从而形成了可热加工的动态复合网络。这些基于 CS 的塑料替代品表现出优异的机械性能、出色的热/化学稳定性以及一系列自适应性，包括自修复、再加工和多层层压。值得注意的是，CPs 可以很容易地降解和 100%回收，用于生产下一代材料。这项工作为生产绿色和可持续的生物质材料作为塑料替代品提供了一种替代途径。
