由地板温度调节的热稳定和化学可回收的聚乙烯
Xian-Bin Meng1, Tong Zhou1, Chun Yang1
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry & Molecular Engineering, Peking University, Beijing 100871, China.
Journal of the American Chemical Society
|May 25, 2024
概括
这项研究引入了一种用于可持续塑料的新型地板温度调节聚乙烯 (PHOD). PHOD具有极好的热稳定性和在室温下快速的化学回收,促进循环经济的目标.
科学领域:
- 聚合物化学
- 材料科学
- 可持续的化学
背景情况:
- 化学回收到单体 (CRM) 是循环塑料经济的关键,通常侧重于天花板温度 (Tc) 调节.
- 低Tc的聚合物,如聚乙烯 (PGBL),具有有限的热稳定性 (分解在200°C).
- 地板温度 (Tf) 调节的聚合物,特别是来自巨乳环开放聚合物 (ROP),提供了增强的热力学稳定性,但尚未得到充分研究.
研究的目的:
- 使用生物基单体开发一种新的受Tf调节的闭环化学可回收聚合物.
- 研究合成的聚乙醇 (PHOD) 的热稳定性和可回收性.
- 探索可调节性和可回收性的共聚化.
主要方法:
- 基于生物的宏环二单体 (HOD) 的设计和合成.
- 输入驱动的HOD环开聚合 (ROP) 产生聚乙醇 (PHOD).
- 使用1- (tBuOK) 在室温下评估热稳定性 (Td,5%) 和闭环化学回收性.
- 在HOD与pentadecanolide (PDL) 的共聚化中.
主要成果:
- 高摩尔质量PHOD的合成具有特殊的热稳定性 (Td,5%至353°C),即使没有去除催化剂,也保持了345°C.
- 在室温下,PHOD 证明了快速 (1 分钟) 的闭环化学回收性.
- 聚合物 (PHOD-co-PPDL) 显示了两种单体的可调性机械性能和可回收性.
结论:
- 调节Tf的PHOD为调节Tc的聚合物提供了一个有希望的替代品,可以克服热稳定性的限制.
- 开发的材料可以有效地在低温下进行化学回收,从而支持循环塑料经济.
- 配合聚合提供了具有量身定制性能和可回收性的先进材料的途径.
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