在温和的温度下通过与聚 (丁糖酸-辅酸) (PBSA) 或聚烯 (PCL) 混合,使聚 (乳酸) (PLA) 的生物降解
Dimitri Van de Perre1, Lynn Serbruyns1, Maria-Beatrice Coltelli2,3
1Normec OWS nv, Pantserschipstraat 163, 9000 Ghent, Belgium.
Materials (Basel, Switzerland)
|November 27, 2024
概括
混合聚 (乳酸) (PLA) 与其他生物塑料,如聚 (丁酸盐-co-adipate) (PBSA) 或聚 (caprolactone) (PCL) 增强其在家庭堆肥和土壤中的降解. 海洋条件也表明PLA是可降解的,盐有助于这一过程.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 环境科学 环境科学
背景情况:
- 来自生物资源的生物基塑料提供了可持续的替代品,但通常具有有限的生物降解性.
- 聚 (乳酸) (PLA) 是一种广泛使用的生物塑料,可在工业上进行堆肥,但其在家庭堆肥,土壤和海洋环境中的降解需要改进.
- 提高像PLA这样的生物塑料的生命周期结束选择对于减少环境影响至关重要.
研究的目的:
- 研究聚乳酸 (PLA) 混合物在各种环境条件下的生物降解性,包括家庭堆肥,土壤和海洋/淡水.
- 确定将PLA与聚乙烯 (丁酸) (PBSA) 或聚乙烯 (PCL) 混合是否可以提高其降解率.
- 了解混合物形态与降解性能之间的关系.
主要方法:
- 通过挤压制备PLA混合物,其中含有不同比例的PBSA或PCL.
- 通过家庭堆肥,土壤埋葬和海洋/淡水浸泡试验来表征混合物生物降解性.
- 使用电子显微镜进行形态分析,以将结构与降解行为相关联.
主要成果:
- 与PBSA或PCL混合PLA显著提高了其在家庭和土壤条件下的堆肥性.
- 在混合物中实现同连续相分布,受成分和融粘度的影响,增强了PLA降解.
- 纯PLA在海洋条件下具有可降解性,溶解盐在加速过程中发挥着关键作用.
结论:
- 混合是一种有效的策略,可以提高PLA的家庭堆肥性和土壤降解性.
- 通过混合进行形态控制,可以优化PLA在特定环境中的生物降解.
- 海洋环境,特别是盐的存在,可以促进PLA的降解,这表明它可能在海洋条件下分解.
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