A synthetic polymer system with repeatable chemical recyclability
A synthetic polymer system with repeatable chemical recyclability
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DOI：
10.1126/science.aar5498
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发表时间：
2018-04-27
期刊：
影响因子：
56.9
通讯作者：
Chen, Eugene Y. -X.
中科院分区：
文献类型：
--
作者：
Zhu, Jian-Bo;Watson, Eli M.;Chen, Eugene Y. -X.
化学可回收聚合物的发展为聚合物材料的最终使用问题提供了解决方案，并提供了一种实现循环材料经济的闭环方法。然而，容易和选择性地解聚回单体的聚合物通常需要低温聚合方法，而且缺乏实际使用所需的物理性能和机械强度。我们介绍了一种基于g-丁内酯(GBL)的聚合物体系，在α和β位置进行了反环融合。这种反环融合使得通常被认为不可聚合的GBL环可以在室温下在无溶剂的条件下容易聚合，从而产生高分子量的聚合物。该聚合物具有增强的热稳定性，并且可以通过热分解或化学分解重复定量地回收回其单体。聚合物的两个对映体混合生成高度结晶的超分子立体络合物。
The development of chemically recyclable polymers offers a solution to the end-of-use issue of polymeric materials and provides a closed-loop approach toward a circular materials economy. However, polymers that can be easily and selectively depolymerized back to monomers typically require low-temperature polymerization methods and also lack physical properties and mechanical strengths required for practical uses. We introduce a polymer system based on g-butyrolactone (GBL) with a trans-ring fusion at the alpha and beta positions. Such trans-ring fusion renders the commonly considered as nonpolymerizable GBL ring readily polymerizable at room temperature under solvent-free conditions to yield a high-molecular weight polymer. The polymer has enhanced thermostability and can be repeatedly and quantitatively recycled back to its monomer by thermolysis or chemolysis. Mixing of the two enantiomers of the polymer generates a highly crystalline supramolecular stereocomplex.