Transformation of gels via catalyst-free selective RAFT photoactivation
Transformation of gels via catalyst-free selective RAFT photoactivation
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通过无催化剂选择性 RAFT 光活化实现凝胶转化
DOI：
10.1039/c9py00213h
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发表时间：
2019
影响因子：
4.6
通讯作者：
Matyjaszewski, Krzysztof
中科院分区：
文献类型：
--
作者：
Shanmugam, Sivaprakash;Cuthbert, Julia;Flum, Jacob;Fantin, Marco;Boyer, Cyrille;Kowalewski, Tomasz;Matyjaszewski, Krzysztof
这项工作探索了结构定制和工程大分子(STEM)网络的概念，提出了一种新的无金属方法来制备网络。茎网络是由具有潜在引发剂位置的聚合物网络组成的，可以进行合成后修饰。该方法依赖于可见光FRAFT光解结合FRAW加成-裂解过程，选择性地激活三硫代甲酸盐类RAFT试剂的裂解。这项工作中探索的两步合成产生的网络在成分和机械上都比它们原始的网络有所区别。此外，通过仔细选择交联剂，在绿光照射下，传统的聚乙二醇二甲基丙烯酸酯(MN=750)或三硫代碳酸酯交联剂(双[(2-丙酸乙酯)甲基丙烯酸乙酯]三硫代碳酸酯(双PEMAT))和不同浓度的RAFT在甲基丙烯酸甲酯((2-(2-(n-butyltrithiocarbonate)-propionate)ethyl)中形成了三种不同类型的初级(STEM0)聚甲基丙烯酸甲酯(PMMA)网络。然后用甲基丙烯酸甲酯(MA)或N，N-二甲基丙烯酰胺(DMA)在蓝光照射下对这些网络进行修饰，得到对极性(亲水性/疏水性)有不同反应的STEM-1凝胶。
This work explores the concept of structurally tailored and engineered macromolecular (STEM) networks by proposing a novel metal-free approach to prepare the networks. STEM networks are composed of polymer networks with latent initiator sites affording post-synthesis modification. The proposed approach relies on selectively activating the fragmentation of trithiocarbonate RAFT agent by relying on visible light RAFT iniferter photolysis coupled with RAFT addition–fragmentation process. The two-step synthesis explored in this work generates networks that are compositionally and mechanically differentiated than their pristine network. In addition, by careful selection of crosslinkers, conventional poly(ethylene glycol) dimethacrylate (Mn = 750) or trithiocarbonate dimethacrylate crosslinker (bis[(2-propionate)ethyl methacrylate] trithiocarbonate (bisPEMAT)), and varying concentrations of RAFT inimer (2-(2-(n-butyltrithiocarbonate)-propionate)ethyl methacrylate (BTPEMA)), three different types of primary (STEM-0) poly(methyl methacrylate) (PMMA) networks were generated under green light irradiation. These networks were then modified with methyl acrylate (MA) or N,N-dimethylacrylamide (DMA), under blue light irradiation to yield STEM-1 gels that are either stiffer or softer with different responses to polarity (hydrophilicity/hydrophobicity).
影响因子：
5.8
作者：
Jordan C Theriot;G. Miyake;C. Boyer
通讯作者：
Jordan C Theriot;G. Miyake;C. Boyer
影响因子：
5.5
作者：
Tsitsilianis, Constantinos;Serras, George;Chassenieux, Christophe
通讯作者：
Chassenieux, Christophe