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首页> 外文学位 >Development of monomolecular, oligomeric and polymeric carbazole compounds as photosensitizers for photoinitiated cationic polymerization.
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Development of monomolecular, oligomeric and polymeric carbazole compounds as photosensitizers for photoinitiated cationic polymerization.

机译：开发单分子，低聚和聚合咔唑化合物作为光敏阳离子聚合的光敏剂。

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摘要

Enhancement of the rates of onium salt photoinitiated cationic polymerization of epoxide and vinyl ether monomers has been observed through the use of carbazole compounds. It was demonstrated that various carbazole-containing compounds and polymer/copolymers are effective electron-transfer photosensitizers. The photosensitizable cationic onium salt initiators include diaryliodonium, triarylsulfonium, and dialkylphenacylsulfonium salts.; In the presence of large amount of N-vinyl carbazole (NVK), the rate of photoinitiated cationic polymerization of epoxide and vinyl ether monomers was more significantly increased compared with the presence of small amounts of (2% based on monomer) carbazole compounds and this effect was not observed with other carbazole compounds. The effect was ascribed to a photoinitiated free-radical chain reaction that results in the oxidation of N-vinyl carbazole by the onium salt initiators to generate cations. These cations can initiate the polymerization of epoxide and vinyl ether monomers, leading to the production of copolymers.; Poly(N-vinylcarbazole) (PVK) is an especially attractive and efficient photosensitizer. PVK functions as an electron-transfer photosensitizer for a variety of onium salt cationic photoinitiators. Alternating copolymers prepared by the free radical copolymerization of N-vinylcarbazole (NVK) with vinyl monomers also exhibit excellent photosensitization activity. The broadening of the spectral response through the use of these photosensitizers accounts for the observed rate enhancement of these polymerization systems. Also studied is the synthesis and use of a dimeric photosensitizer prepared by the hydrosilation of NVK with 1,1,3,3-tetramethyldisiloxane.; Other monomers that contain both carbazole group and cationic polymerizable groups were studied. These monomers were efficiently photopolymerized in the presence of onium salt photoinitiators. The photosensitization effect of these monomers and polymers was also investigated. The inclusion of a small amount of these monomers and polymers prepared by the polymerization of the monomeric photosensitizers markedly accelerated the photopolymerization of cationic monomers. This effect was ascribed to the electron-transfer photosensitization by these monomers and polymers.
机译：通过使用咔唑化合物，已经观察到了环盐和乙烯基醚单体的鎓盐光引发的阳离子聚合速率的提高。已经证明各种含咔唑的化合物和聚合物/共聚物是有效的电子转移光敏剂。可光敏的阳离子鎓盐引发剂包括二芳基碘鎓，三芳基s和二烷基苯并acy鎓盐。在存在大量N-乙烯基咔唑（NVK）的情况下，与存在少量（基于单体的<2％）相比，环氧化物和乙烯基醚单体的光引发阳离子聚合速率会显着提高。其他咔唑化合物未观察到这种作用。该作用归因于光引发的自由基链反应，该反应导致N-乙烯基咔唑被鎓盐引发剂氧化而产生阳离子。这些阳离子可以引发环氧化物和乙烯基醚单体的聚合，导致共聚物的生产。聚（N-乙烯基咔唑）（PVK）是一种特别有吸引力且有效的光敏剂。 PVK用作各种鎓盐阳离子光引发剂的电子转移光敏剂。通过N-乙烯基咔唑（NVK）与乙烯基单体的自由基共聚制备的交替共聚物也具有出色的光敏活性。通过使用这些光敏剂使光谱响应变宽，说明了这些聚合体系的速率提高。还研究了通过NVK与1,1,3,3-四甲基二硅氧烷的硅氢加成反应制备的二聚光敏剂的合成和用途。研究了同时含有咔唑基团和阳离子可聚合基团的其他单体。这些单体在鎓盐光引发剂的存在下有效地光聚合。还研究了这些单体和聚合物的光敏作用。包含少量这些单体和通过单体光敏剂聚合制得的聚合物显着促进了阳离子单体的光聚合。这些作用归因于这些单体和聚合物的电子转移光敏作用。

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  • 作者

    Hua, Yujing.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Chemistry Polymer.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 95 p.
  • 总页数 95
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化学（高聚物）;
  • 关键词

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