PET-RAFT Increases Uniformity in Polymer Networks
PET-RAFT Increases Uniformity in Polymer Networks
复制标题
PET-RAFT 提高聚合物网络的均匀性
DOI：
10.1021/acsmacrolett.2c00448
复制
发表时间：
2022
影响因子：
7.015
通讯作者：
Konkolewicz, Dominik
中科院分区：
文献类型：
--
作者：
Wanasinghe, Shiwanka V.;Sun, Mingkang;Yehl, Kevin;Cuthbert, Julia;Matyjaszewski, Krzysztof;Konkolewicz, Dominik
采用光诱导电子/能量转移（PET）-可逆加成-断裂链转移聚合（RAFT）和传统的光引发RAFT方法合成聚合物网络。在本研究中，选择了两种不同的金属催化剂，即三[2-苯基吡啶-C2，N]铱（III）（Ir（ppy）3）和四苯基卟啉锌（ZnTPP），以产生两种不同的催化途径，一种是Ir（ppy）3通过能量转移途径进行，一种是ZnTPP通过电子转移途径进行.这些PET-RAFT系统与传统的光引发RAFT工艺进行对比。产生了机械坚固的材料。使用体积溶胀比和可降解的交联剂，网络的均匀性进行了评价。特别是在高的主链长度和交联密度，PET-RAFT系统产生更均匀的网络比那些由传统的RAFT，与电子转移为基础的ZnTPP给上级的结果，Ir（ppy）3。提出了通过PET RAFT中的RAFT交换或可逆偶联使自由基失活的能力作为在PET-RAFT系统中提供更好控制的机制。
Photoinduced electron/energy transfer (PET)-reversible addition–fragmentation chain transfer polymerization (RAFT) and conventional photoinitiated RAFT were used to synthesize polymer networks. In this study, two different metal catalysts, namely, tris[2-phenylpyridinato-C2,N]iridium(III) (Ir(ppy)3) and zinc tetraphenylporphyrin (ZnTPP), were selected to generate two different catalytic pathways, one with Ir(ppy)3proceeding through an energy-transfer pathway and one with ZnTPP proceeding through an electron-transfer pathway. These PET-RAFT systems were contrasted against a conventional photoinitated RAFT process. Mechanically robust materials were generated. Using bulk swelling ratios and degradable cross-linkers, the homogeneity of the networks was evaluated. Especially at high primary chain length and cross-link density, the PET-RAFT systems generated more uniform networks than those made by conventional RAFT, with the electron transfer-based ZnTPP giving superior results to those of Ir(ppy)3. The ability to deactivate radicals either by RAFT exchange or reversible coupling in PET RAFT was proposed as the mechanism that gave better control in PET-RAFT systems.