在基于聚乳酸的可持续共聚合物中的细分流动性 (建在聚乳酸上) in situ
Panagiotis A Klonos1,2, Nikolaos D Bikiaris1, Alexandra Zamboulis1
1Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece. pklonos@central.ntua.gr.
Soft matter
|October 9, 2023
概括
新合成的可持续的聚乙烯酸) /聚酸 (PBSu/PLA) 共聚合物显示出增强的分子流动性和更快的结晶. 这些块共聚合物提供了较好的性能和潜在的增加堆肥性比整洁的多聚化物.
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
- 可持续化学 可持续化学
背景情况:
- 聚酸 (PLA) 是一种可生物降解的聚合物,其降解速度和可加工性受到限制.
- 可持续的区块共聚合物提供了一条增强PLA特性和促进可再生性的途径.
- 聚乙烯酸 (PBSu) 是一种柔性,低玻璃过渡温度的聚合物,适合与PLA混合.
研究的目的:
- 合成和描述PBSu和PLA的新型可持续区块共聚合物.
- 研究PBSu/PLA比率和链条长度对热过渡,分子移动性和结晶的影响.
- 评估提高材料性能和可堆肥性的潜力.
主要方法:
- 通过环开聚合合成PBSu/PLA块共聚合物的合成.
- 热量计 (DSC) 用于确定热过渡 (玻璃过渡温度,结晶).
- 介电光谱检测分子移动性 (α放松) 和链动力学 (动态脆弱性).
主要成果:
- 增加的PBSu含量有系统地降低了玻璃过渡温度 (Tg和Tg,diel),并在无形状态下增强了细分移动性.
- PBSu充当了增塑剂,降低了Tg,并促进了更快的链扩散和结晶.
- 动态脆弱性被抑制,表明自由体积增加或链间距离增加,可能提高堆肥性.
结论:
- 与整洁的PLA相比,PBSu/PLA块共聚物表现出增强的分子动力学和结晶.
- 观察到的变化表明可加工性得到改善,酶降解 (可分解性) 可能更快.
- 共聚合提供了一种可行的策略,以定制基于PLA的材料的材料性能和可持续性.
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