In situ monitoring of SI-ATRP throughout multiple reinitiations under flow by means of a quartz crystal microbalance.
In situ monitoring of SI-ATRP throughout multiple reinitiations under flow by means of a quartz crystal microbalance.
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DOI：
10.1039/c8ra03073a
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发表时间：
2018-06-03
期刊：
影响因子：
3.9
通讯作者：
Dübner M
中科院分区：
文献类型：
--
作者：
Mandal J;Varunprasaath RS;Yan W;Divandari M;Spencer ND;Dübner M
用石英晶体微天平原位研究了甲基丙烯酸2-羟乙酯（HEMA）的表面引发原子转移自由基聚合（SI-ATRP），在反应混合物连续流动下进行多次再引发。通过改变频率、温度、溶剂组成、单体浓度和催化剂浓度等条件，对HEMA的SI-ATRP动力学进行了连续研究，揭示了关键反应参数对SI-ATRP动力学的影响。这样的实验使得能够设计一种聚合方案，该方案导致聚（HEMA）刷的合理快速但良好控制的生长。此外，当聚合停止并重新启动多次（对于嵌段合成至关重要）时，仅观察到生长速率的微小变化，这证明了在这种条件下SI-ATRP反应的活性本质。在基于流动的QCM中，反应混合物的清洁切换已被证明是实时原位研究表面引发的聚合反应的有力工具，并且是精确制造含块刷结构的有前途的方法。用石英晶体微天平原位研究了甲基丙烯酸2-羟乙酯（HEMA）的表面引发原子转移自由基聚合（SI-ATRP），在反应混合物连续流动下进行多次再引发。
An investigation of the polymerisation of 2-hydroxyethyl methacrylate (HEMA) by means of surface-initiated atom transfer radical polymerisation (SI-ATRP) has been carried out in situ using a quartz crystal microbalance, with multiple reinitiations under continuous flow of the reaction mixture. The SI-ATRP kinetics of HEMA were studied continuously by means of changes in the frequency, varying conditions including temperature and solvent composition, as well as monomer and catalyst concentrations, showing the influence of key reaction parameters on SI-ATRP kinetics. Such experiments enabled the design of a polymerisation protocol that leads to a reasonably fast but well-controlled growth of poly(HEMA) brushes. Furthermore, only a minor change in growth rate was observed when the polymerisation was stopped and reinitiated multiple times (essential for block synthesis), demonstrating the living nature of the SI-ATRP reaction under such conditions. The clean switching of reaction mixtures in the flow-based QCM has been shown to be a powerful tool for real-time in situ studies of surface-initiated polymerisation reactions, and a promising approach for the precise fabrication of block-containing brush structures. The polymerisation of 2-hydroxyethyl methacrylate (HEMA) by means of surface-initiated atom transfer radical polymerisation (SI-ATRP) has been studied in situ using a quartz crystal microbalance, with multiple reinitiations under continuous flow of the reaction mixture.
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影响因子：
3.9
作者：
Dehghani, Ella S.;Spencer, Nicholas D.;Benetti, Edmond M.
通讯作者：
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影响因子：
5.4
作者：
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作者：
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5.5
作者：
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通讯作者：
Matyjaszewski, Krzysztof
影响因子：
3.4
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通讯作者：
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