用聚乙烯糖醇基塑化剂增强聚乳酸膜:一种反应挤出方法
Carlos Lazaro-Hdez1, Jaume Gomez-Carturla1, Marina P Arrieta2,3
1Instituto Universitario de Investigación de Tecnología de Materiales (IUITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, Alcoy, Alicante, 03801, Spain.
Macromolecular rapid communications
|May 20, 2025
概括
反应挤出增强聚乳酸 (PLA) 薄膜与聚乙烯糖醇 (PEG) 增塑剂,提高灵活性和减少安全食品接触的迁移. 这一过程提高了机械和热性能,扩大了PLA.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
背景情况:
- 聚乳酸 (PLA) 是一种可生物降解的聚合物,其灵活性和可塑化剂迁移受到限制.
- 提高PLA的性能对于扩大其应用,特别是食品包装至关重要.
研究的目的:
- 为了提高PLA薄膜的机械和热性能,使用聚乙烯糖醇 (PEG) 基塑化剂.
- 通过反应挤出 (REX) 来减少PLA薄膜中的塑化剂迁移.
- 评估修改后的PLA薄膜是否适用于与食品接触的应用.
主要方法:
- 使用聚乙烯糖醇 (PEG) 作为可塑剂对PLA薄膜进行修改.
- 作为交叉链接剂的二甲基过氧化物 (DCP) 的反应挤出 (REX) 的应用.
- 评估机械性能 (破裂时的延长,抗拉强度),热稳定性,玻璃过渡温度 (Tg),可塑化剂迁移,光学性能和水蒸气透性.
主要成果:
- 加入PEG使破裂时的延长率从12.0%增加到61.3%,同时保持拉伸强度.
- 雷克斯显著减少了塑化剂的迁移,从140.3 mg/kg降至40.8 mg/kg.
- 降解温度从268.7°C增加到333.8°C,Tg降低到38.3°C,提高了柔性.
- 经过修改的膜显示保持透明度和增加水蒸气透性.
结论:
- 反应挤出有效地增强了用PEG塑性化的PLA薄膜,提高了机械强度,延展性和热稳定性.
- 减少塑化剂迁移使得这些修改后的PLA薄膜在与食品接触的应用中安全.
- 改进的性能扩大了PLA的工业应用,同时保持了其对环境的好处.
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