文獻(xiàn)；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 ?ztürk,Melahat G?kta? &Bakí Hazer

文獻(xiàn)鏈接：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.

使用新型雙大分子引發(fā)劑（RAFT試劑）通過可逆加成-斷裂鏈轉(zhuǎn)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試劑由黃原酸乙酯的鉀鹽和末端溴化的聚乙二醇（Br-PEG-Br）獲得，后者是通過聚乙二醇[PEG]與Mn=3000道爾頓和3-溴丙酰氯反應(yīng)合成的。

評估了影響聚合反應(yīng)的主要參數(shù)，如單體濃度、引發(fā)劑濃度和聚合時(shí)間。

使用傅里葉變換紅外光譜（FTIR）、質(zhì)子核磁共振（1H-NMR）、凝膠滲透色譜（GPC）、熱重分析（TGA）和分級沉淀（γ）技術(shù)對產(chǎn)品進(jìn)行表征。通過GPC獲得的聚合物的分子量與理論值一致。RAFT聚合用于在寬分子量范圍內(nèi)控制MMA的聚合。

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