Clarke Brandon R, Tew Gregory N
Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.
Macromolecules. 2022 Jun 28;55(12):5131-5139. doi: 10.1021/acs.macromol.2c00449. Epub 2022 Jun 8.
We report the synthesis of novel poly(ethylene glycol) and poly(dimethyl siloxane) (PEG and PDMS, respectively) bottlebrush amphiphilic polymer co-networks (B-APCNs) with high gel fractions by a grafting-through ring-opening metathesis polymerization. By varying the volume fraction of PEG (), we alter the crystallinity of the networks, achieving complete suppression of PEG crystallinity at . Furthermore, we show that the crystallinity of these networks can be tuned to alter their moduli. Through dynamic mechanical analysis, we show that the storage and loss moduli of networks with completely suppressed crystallinity () behave similarly to a PDMS homopolymer bottlebrush network. These bottlebrush networks represent an unexplored architecture for the field of amphiphilic polymer co-networks.
我们报道了通过开环易位接枝聚合反应合成具有高凝胶分数的新型聚（乙二醇）和聚（二甲基硅氧烷）（分别为PEG和PDMS）刷状两亲聚合物共网络（B-APCNs）。通过改变PEG的体积分数（），我们改变了网络的结晶度，在时实现了PEG结晶度的完全抑制。此外，我们表明这些网络的结晶度可以调节以改变其模量。通过动态力学分析，我们表明结晶度完全被抑制（）的网络的储能模量和损耗模量的行为与PDMS均聚物刷状网络相似。这些刷状网络代表了两亲聚合物共网络领域中尚未探索的结构。
