Closing the “One Monomer–Two Polymers–One Monomer” Loop via Orthogonal (De)polymerization of a Lactone/Olefin Hybrid
作者:Changxia Shi、Ryan W. Clarke、Michael L. McGraw、Eugene Y.-X. Chen
DOI:10.1021/jacs.1c12278
日期:2022.2.9
polyester and cyclohexene toward ring-opening metathesis polymerization (ROMP) to poly(cyclic olefin), are notoriously “nonpolymerizable”. Here we present a strategy to render not only polymerizability of both the γ-BL and cyclohexene sites, orthogonally, but also complete and orthogonal depolymerization, through creating an LCT/LCT hybrid, bicyclic lactone/olefin (BiL=). This hybrid monomer undergoes orthogonal
两种众所周知的低温 (LCT) 单体,γ-丁内酯 (γ-BL) 向聚酯的开环聚合 (ROP) 和环己烯向聚(环烯烃)的开环复分解聚合 (ROMP),是出了名的“不可聚合”。在这里,我们提出了一种策略,通过创建 LCT/LCT 杂化双环内酯/烯烃 (BiL = ),不仅可以使 γ-BL 和环己烯位点正交,而且可以完全和正交解聚。这种杂化单体在 ROP 和 ROMP 之间进行正交聚合,这取决于所使用的催化剂,从这种单一单体中提供两种完全不同类别的聚合物材料:聚酯 P(BiL = ) ROP通过 ROP 和官能化聚(环烯烃) P(BiL = ) ROMP通过 ROMP。有趣的是,P(BiL = ) ROP和 P(BiL = ) ROMP在温和条件(25-40°C)下,在催化剂存在下,具有热稳定性,但可化学回收,以分别通过链解链和断裂来干净地回收相同的单体。在 ROP 中,已经实现了拓扑和立体化学