Photocontrolled cationic degenerate chain transfer polymerizations via thioacetal initiators

Photocontrolled cationic degenerate chain transfer polymerizations via thioacetal initiators
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通过硫缩醛引发剂进行光控阳离子简并链转移聚合

DOI:
10.1039/d0py01100b
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发表时间:
2020
期刊:
影响因子:
4.6
通讯作者:
Fors, Brett P.
Fors, Brett P.
中科院分区:
化学2区
文献类型:
--
作者:
Sifri, Renee J.;Kennedy, Audrey J.;Fors, Brett P.

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光控聚合的最新发展促进了以前难以获得的材料的开发。虽然光控自由基聚合已被广泛研究,但涉及阳离子聚合的相关过程尚未得到充分探索,仅限于RAFT过程。在这项研究中,我们利用硫缩醛和光氧化还原催化剂,揭示了一种可见光、暂时控制的乙烯基醚阳离子聚合。我们展示了广泛范围的硫缩醛引发剂,通过光催化剂翻转和通过磺胺中间体的简并链转移过程,通过重包传播链来实现良好控制的聚合。此外,我们表明具有更还原基态还原电位的光催化剂可以增强聚合的控制和良好的时间调节。
Recent developments in photocontrolled polymerizations have facilitated the development of previously inaccessible materials. While photocontrolled radical polymerizations have been extensively studied, related processes involving cationic polymerizations are underexplored and limited to RAFT processes. In this study, we disclose a visible light, temporally controlled cationic polymerization of vinyl ethers utilizing thioacetals and a photoredox catalyst. We demonstrate a broad scope of thioacetal initiators that achieve a well-controlled polymerization by recapping propagating chains via photocatalyst turnover in combination with a degenerate chain transfer process through sulfonium intermediates. Furthermore, we show that a photocatalyst with a more reducing ground state reduction potential allows for enhanced control and excellent temporal regulation of polymerization.
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