文献；Synthesis and Characterization of Poly(methyl methacrylate-block-ethylene glycol-block-methyl methacrylate) Block Copolymers by Reversible Addition-Fragmentation Chain Transfer Polymerization

作者：Temel Öztürk,Melahat Göktaş &Bakí Hazer

文献链接：https://www.tandfonline.com/doi/abs/10.1080/10601325.2011.528310

Synthesis of poly(methyl methacrylate-block-ethylene glycol-block-methyl methacrylate) triblock copolymers by reversible addition–fragmentation chain transfer (RAFT) by using a novel dual macro initiator (RAFT-agent) is reported. RAFT-agent is obtained from potassium salt of the ethyl xanthegonate and the terminally brominated poly(ethylene glycol) (Br-PEG-Br) which is synthesized by the reaction of poly(ethylene glycol) [PEG] with Mn= 3000 Dalton and 3-bromopropionyl chloride. The principal parameters such as monomer concentration, initiator concentration, and polymerization time that affect the polymerization reaction are evaluated. The characterization of the products is achieved using Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H-NMR), gel-permeation chromatography (GPC), thermogravimetric analysis (TGA), and fractional precipitation (γ) techniques. Molecular weights of the polymers obtained from GPC agreed with the theoretical values. RAFT polymerization is used to control the polymerization of MMA over a broad range of molecular weights.

使用新型双大分子引发剂（RAFT试剂）通过可逆加成-断裂链转移（RAFT）合成聚甲基丙烯酸甲酯嵌段-乙二醇嵌段-甲基丙烯酸甲酯三嵌段共聚物。

RAFT试剂由黄原酸乙酯的钾盐和末端溴化的聚乙二醇（Br-PEG-Br）获得，后者是通过聚乙二醇[PEG]与Mn=3000道尔顿和3-溴丙酰氯反应合成的。

评估了影响聚合反应的主要参数，如单体浓度、引发剂浓度和聚合时间。

使用傅里叶变换红外光谱（FTIR）、质子核磁共振（1H-NMR）、凝胶渗透色谱（GPC）、热重分析（TGA）和分级沉淀（γ）技术对产品进行表征。通过GPC获得的聚合物的分子量与理论值一致。RAFT聚合用于在宽分子量范围内控制MMA的聚合。

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