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首页> 外文期刊>RSC Advances >Synthesis of soluble poly(vinylene carbonate) by redox-initiated RAFT process in microemulsion and its aminolysis yielding snow-white polymethylol
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Synthesis of soluble poly(vinylene carbonate) by redox-initiated RAFT process in microemulsion and its aminolysis yielding snow-white polymethylol

机译：微乳液中氧化催化筏法合成可溶性聚（碳酸亚乙烯酯）及其氨基溶液氧化煤层聚甲基

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摘要

The radical polymerization of vinylene carbonate (VCB) above 40 degrees C yields lightly colored and partially soluble polymers by common procedures. Herein, we describe a redox-initiated room temperature micro-emulsion process for the living polymerization of a VCB yielding polymer, which is entirely soluble in DMF, in the presence of a RAFT agent. Despite the polymerization following first order kinetics, the molecular weight-time plot exhibited a sudden rise at the beginning; however, a slow but linear increment was noticed after that, which is typical for a RAFT polymerization in a micro-emulsion. This procedure yielded entirely soluble polymers and the gel permeation chromatograms (GPC) implied an almost constant polydispersity index (PDI: 1.2) within 20-88% conversion range. The process was determined to be living as demonstrated by a chain extension with styrene, yielding a diblock copolymer with nearly double molecular weight. The livingness of the process was confirmed by synthesizing a chain extension of the polymer with styrene using a photo-iniferter technique. Nearly double molecular weight of the resulting polymer within 24 h of irradiation implied the formation of vinylene carbonate-styrene block copolymers. It was demonstrated that the VCB homopolymer readily dissolves in ammonia solution (25%) at room temperature and a snow-white precipitate of the aminolysis product, polymethylol, is observed within a few minutes. Polymethylol is known to be insoluble in common solvents, including water, due to the intermolecular hydrogen bridging. Surprisingly, the polymer was determined to dissolve in 80% phosphoric acid to give optically clear solutions, which were stable for over one week at room temperature. H-1 NMR spectrum of this polymer in D3PO4 indicated a pure polymethylol structure.
机译：高于40℃的碳酸亚乙烯酯（VCB）的自由基聚合通过普通程序产生轻微着色和部分可溶的聚合物。在此，我们描述了一种用于在筏剂存在下完全可溶于DMF的VCB的氧化还原的室温微乳液方法，其完全可溶于DMF。尽管在第一阶动力学之后聚合，但分子量计量曲线突然升高;然而，在此之后注意到慢慢但线性增量，这对于微乳液中的筏聚合是典型的。该方法产生完全可溶的聚合物，凝胶渗透色谱图（GPC）暗示在20-88％转化范围内的几乎恒定的多分散性指数（PDI：1.2）。确定该方法以苯乙烯的链延伸证明，产生具有几乎双分子量的二嵌段共聚物。通过使用光导体技术合成聚合物的链延伸，通过用光导体技术合成聚合物的链延伸来证实该方法的致病。在24小时内，所得聚合物的几乎双分子量暗示了碳酸亚乙烯酯 - 苯乙烯嵌段共聚物的形成。证明VCB均聚物在室温下容易溶解在室温下氨溶液（25％），在几分钟内观察到氨基溶液产物的白溶液产物的白溶液沉淀物。已知聚甲醇由于分子间氢桥接，已知聚甲醇不溶于普通溶剂，包括水。令人惊讶的是，将聚合物溶于80％磷酸中，得到光学透明的溶液，在室温下稳定一周。在D3PO4中该聚合物的H-1 NMR光谱表明了纯的聚甲醇结构。

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  • 来源
    《RSC Advances》 |2015年第39期|共7页
  • 作者

    Kumru Baris; Bicak Niyazi;

  • 作者单位

    Istanbul Tech Univ Dept Chem TR-34469 Istanbul Turkey;

    Istanbul Tech Univ Dept Chem TR-34469 Istanbul Turkey;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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