Visible light-induced controlled surface grafting polymerization of hydroxyethyl methacrylate from isopropylthioxanthone semipinacol-terminated organic monolayers,Polymer Chemistry

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Visible light-induced controlled surface grafting polymerization of hydroxyethyl methacrylate from isopropylthioxanthone semipinacol-terminated organic monolayers
Polymer Chemistry ( IF 4.1 ) Pub Date : 2021-1-6 , DOI: 10.1039/d0py01410a
Ajitha Balasubramaniam _{1,

2,

3,

4} , Emily Manderfeld _{1,

2,

3,

4} , Lutz M. K. Krause _{1,

2,

3,

4} , Robin Wanka _{1,

2,

3,

4} , Jana Schwarze _{1,

2,

3,

4} , Cindy D. Beyer _{1,

2,

3,

4} , Axel Rosenhahn _{1,

2,

3,

4}

Affiliation

A visible light-induced living polymerization of a hydrophilic model monomer was initiated on organic silane monolayers using isopropylthioxanthone (ITX). The type II photoinitiator ITX was covalently introduced to the octadecyltrichlorosilane monolayers by UV-induced (254 nm) hydrogen abstraction and a subsequent coupling step through recombination. The resulting dormant isopropylthioxanthone semi-pinacol (ITXSP) groups can be reactivated by irradiation with visible light to initiate a controlled surface grafting polymerization. Using this surface-initiated polymerization approach, hydroxyethyl methacrylate (HEMA) was polymerized under visible light irradiation (385 nm) at room temperature. The polymer layer thickness depends linearly on the irradiation time, which is in good agreement with previous reports on the living characteristics of the polymerization reactions. It is possible to accurately control the thickness of the grafted layer by simply altering the irradiation time.

中文翻译：

可见光诱导的异丙基噻吨酮-频哪醇封端的有机单分子层催化甲基丙烯酸羟乙酯的表面接枝聚合

使用异丙基噻吨酮（ITX）在有机硅烷单层上引发了亲水模型单体的可见光诱导的活性聚合。通过UV诱导（254 nm）的氢提取和随后的重组偶联步骤，将II型光引发剂ITX共价引入到十八烷基三氯硅烷单层中。可以通过用可见光照射来重新活化所得的休眠的异丙基噻吨酮半频哪醇（ITXSP）基团，以引发受控的表面接枝聚合反应。使用这种表面引发的聚合方法，在室温下在可见光照射（385 nm）下聚合甲基丙烯酸羟乙酯（HEMA）。聚合物层的厚度与辐照时间成线性关系，这与先前关于聚合反应的活性特征的报道非常吻合。只需改变照射时间，就可以准确地控制接枝层的厚度。

更新日期：2021-01-06

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