期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 223, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2022.109410
关键词
Poly(lactic acid); Diatom frustule; Bulk degradation; Porous silica; Microfibril crystal
资金
- Guangdong Provincial Key Laboratory Program [2021B1212040001]
- Department of Science and Technology of Guangdong Province
- Shenzhen Jawkai Bioengineering R&D Center Co., Ltd.
In this study, diatom frustules were incorporated into PLA, resulting in a significant improvement in degradation rate. This method provides an efficient way for the rapid development of biodegradable plastics.
In the field of governing our Plastic Planet, polylactic acid (PLA) has been considered to be a promising and ecologically friendlier alternative to traditional petroleum-based plastics. However, PLA-based products degrade slowly in the natural environment, likely resulting in a large accumulation of PLA waste worldwide in the near future. Herein, we have incorporated artificially cultured diatom frustules (DFs) into PLA, and found an improvement of more than eightfold on the degradation rate, from more than 24 months to 3 months or even less, as compared with the pure PLA. Mechanistic investigations illustrate that DFs change the degradation behavior of PLA from surface erosion to bulk erosion by the induced microfibril crystals. Simulation analysis verifies that the unstable crack propagation inside the PLA matrix greatly accelerates the degradation. The method developed in this work provides an efficient way to achieve rapid and adjustable degradation of biodegradable polymers for the urgent and widespread usage of green plastic productions.
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