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首页> 外文学位 >RADIATION EFFECTS ON POLY(GLYCIDYL METHACRYLATE - CO-ETHYL METHACRYLATE) COPOLYMERS AND ELECTRON PARAMAGNETIC RESONANCE CHARACTERIZATION OF VANADIUM HEXACARBONYL USING THE TECHNIQUE OF PARTIAL ORIENTATION.
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RADIATION EFFECTS ON POLY(GLYCIDYL METHACRYLATE - CO-ETHYL METHACRYLATE) COPOLYMERS AND ELECTRON PARAMAGNETIC RESONANCE CHARACTERIZATION OF VANADIUM HEXACARBONYL USING THE TECHNIQUE OF PARTIAL ORIENTATION.

机译：偏取向技术对钒（甲基丙烯酸缩水甘油酯-甲基丙烯酸乙酯）共聚物的辐射效应及六碳钒钒的电子顺磁共振表征。

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摘要

Part I. The effects of gamma radiation on a series of characterized copolymers, synthesisized from different molar ratios of glycidyl methacrylate (GMA) and ethyl methacrylate (EMA), have been studied using a variety of techniques.; Polymers were characterized using IR, NMR, GPC, and viscosity measurements. Radiation G values for crosslinking and scission were calculated using the analysis developed by Charlesby and Pinner in order to compare the effects of radiation on the epoxide and methacrylate functionalities. The analysis of radiation G values suggests that at glycidyl methacrylate concentrations below 10%, crosslinking does not predominate. However, at higher GMA concentrations, G values for crosslinking increase, and at GMA concentration over 60%, G values approach 10, a value only reached by chain reactions.; Spectroscopic evidence is presented for the participation of the glycidyl group in radiation-induced reactions. FTIR studies on irradiated thin films of COP show decreases in the epoxide functional group regions, ca. 908 and 1250 cm{dollar}sp{lcub}-1{rcub}{dollar}. EPR results suggest that a paramagnetic species, possibly due to the epoxide group, is produced by irradiating the polymer.; Part II. The EPR spectral parameters of V(CO){dollar}sb6{dollar}, a stable paramagnetic species have been resolved using the experimental technique of "Partial Orientation." Slow-cooling an EPR sample of V(CO){dollar}sb6{dollar} in cyclohexane produces crystallites containing the solute. When these crystallites are of sufficient size, resolution of the broadened EPR spectrum into the individual g tensors is observed. This induced resolution allows the precise assignment of the hyperfine coupling constants and g tensor values.
机译：第一部分，使用各种技术研究了由不同的甲基丙烯酸缩水甘油酯（GMA）和甲基丙烯酸乙酯（EMA）的摩尔比合成的一系列γ射线对共聚物的影响。使用IR，NMR，GPC和粘度测量对聚合物进行表征。为了比较辐射对环氧化物和甲基丙烯酸酯官能度的影响，使用Charlesby和Pinner开发的分析计算了交联和断裂的辐射G值。辐射G值的分析表明，在甲基丙烯酸缩水甘油酯浓度低于10％时，交联并不占优势。然而，在较高的GMA浓度下，交联的G值增加，而在GMA浓度超过60％时，G值接近10，该值只能通过链式反应达到。光谱证据表明缩水甘油基参与辐射诱导的反应。 FTIR对COP辐照薄膜的研究表明，环氧官能团区域的减少，约。 908和1250 cm {dollar} sp {lcub} -1 {rcub} {dollar}。 EPR结果表明，可能由于环氧基而产生的顺磁性物质是通过辐照聚合物而产生的。第二部分使用“部分取向”的实验技术已解决了稳定的顺磁性物质V（CO）{sb6 {dollar}}的EPR光谱参数。在环己烷中缓慢冷却V（CO）{美元} sb6 {美元}的EPR样品会产生含有溶质的微晶。当这些微晶具有足够的尺寸时，可以观察到扩展的EPR光谱解析为单个g张量。这种诱导的分辨率可以精确分配超精细耦合常数和g张量值。

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  • 作者

    PAYNE, DONALD NALLE, JR.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Chemistry Polymer.; Chemistry Radiation.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 135 p.
  • 总页数 135
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化学（高聚物）;化学;
  • 关键词

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