Photo-induced ATRP of MMA without ligands in ionic liquid
Photo-induced ATRP of MMA without ligands in ionic liquid
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离子液体中无配体的 MMA 光诱导 ATRP
DOI：
10.1007/s13726-017-0510-8
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发表时间：
2017-01
影响因子：
3.1
通讯作者：
Wen-Yuan Xu
中科院分区：
文献类型：
--
作者：
Min-Jie Zhou;Fang He;Hu Wu;Guo‑Xiang Wang;Li‑Chao Liu;Wen-Yuan Xu
在没有配体的情况下，以叶绿素 A 作为光氧化还原催化剂，研究了 Fe 介导的甲基丙烯酸甲酯的光诱导原子转移自由基聚合 (ATRP)。这是关于光诱导和 FeBr3 介导的 ATRP 的第一份报告。该系统提供了一种低成本且环保的ATRP。聚合动力学的良好线性半对数图是一阶时间转换，窄分子量分布解释了良好控制的行为。测得的数均分子量Mn,GPC（由凝胶渗透色谱法测定）随着单体转化率的增加而增加，与理论值（Mn,th）吻合良好。研究了 FeBr3 对聚合反应的影响。所得 PMMA 的值随着 FeBr3 浓度的降低而增加。在该系统中，通过响应可见光而立即打开和关闭的链增长来研究周期性亮/关过程的影响。即使铁基催化剂的浓度降至 4 ppm，聚合反应也是可控的。通过核磁共振光谱法(1H NMR)对合成的聚(甲基丙烯酸甲酯)中具有官能团的链端基团进行表征。然而，扩链实验显示合成聚合物中保留了链端功能，并进一步证实了铁介导的光诱导原子转移自由基聚合的“活性”特征。
Fe-mediated photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate was studied with chlorophyll A as photoredox catalyst in the absence of ligands. This is the first report on photo-induced and FeBr3-mediated ATRP. A low-cost and environmentally friendly ATRP is provided in this system. A good linear semi-logarithmic plot of polymerization kinetics is the first-order time conversion, and narrow molecular weight distributions explain the well-controlled behavior. The measured number average molecular weight,Mn,GPC(determined by gel permeation chromatography), is increased with monomer conversion, and it is in good agreement with the theoretical values (Mn,th). The effect of FeBr3is studied with respect to the polymerization. The values of the resultant PMMA increased with reduced FeBr3concentration. In this system, the effect of periodic light/off process has been investigated through chain growth instantly turned on and off in response to the visible light. The polymerization was controllable even though the concentration of Fe-based catalyst was dropped to 4 ppm. The chain-end group having a functionality in the synthesized poly(methyl methacrylate) was characterized by nuclear magnetic resonance spectrometry (1H NMR). However, chain extension experiments show reserved chain-end functionality in the synthesized polymers and further confirm the “living” feature of the Fe-mediated photo-induced atom transfer radical polymerization.
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影响因子：
8.4
作者：
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通讯作者：
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影响因子：
4.6
作者：
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通讯作者：
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作者：
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作者：
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影响因子：
5.5
作者：
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通讯作者：
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