• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Electrochemical Science >Controlled Degradation of Polymeric Composites Stabilized with Natural Antioxidants
【24h】

Controlled Degradation of Polymeric Composites Stabilized with Natural Antioxidants

机译：天然抗氧化剂稳定的高分子复合材料的可控降解

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The aim of our studies is to assess the effect of tert-butylhydroquinone, naphthoflavone and lawsoneon the stabilization of ethylene-propylene copolymer. Owing to the presence of hydroxyl groups, theirnumber and position in a molecule of naphthoquinone derivatives, these compounds show various anti- oxidizing properties. In a first step we investigated the antioxidant properties of selected compounds. The examination of the electrochemical properties of compounds oxidation on a platinum electrodewas performed in order to assess the mechanism of electrode reactions of these compounds to selectthe most effective antioxidant. The optimized structures of the molecules and the frontier molecularorbital energies of the Highest Occupied Molecular Orbital (HOMO) for each compound calculated.Fourier transform infrared (FTIR) spectroscopy was used to study structural characterization ofcomponents. Thermal stability of their was evaluated by using thermogravimetry analysis (TGA). Theantioxidants tested included tert-butylhydroquinone and lawsone that were incorporated into ethylene- propylene copolymer. EPM vulcanizates were then subjected to UV(A) and thermal ageing. Based onthe changes in deformation energy (K coefficient), OIT (oxygen induction time), the anti-oxidativeefficiency of compounds in the protection of polymers against photodegradation and thermooxidationwas determined.
机译：我们研究的目的是评估叔丁基氢醌，萘黄酮和草酮对乙烯-丙烯共聚物稳定的影响。由于羟基的存在，它们在萘醌衍生物分子中的数量和位置，这些化合物显示出各种抗氧化性能。第一步，我们研究了所选化合物的抗氧化性能。为了评估这些化合物选择最有效的抗氧化剂的电极反应机理，进行了在铂电极上氧化化合物的电化学性能的研究。计算出每种化合物的最佳分子结构和最高占据分子轨道（HOMO）的前沿分子轨道能。傅里叶变换红外（FTIR）光谱用于研究组分的结构表征。通过使用热重分析（TGA）评估它们的热稳定性。测试的抗氧化剂包括叔丁基对苯二酚和Lawone，它们被掺入到乙烯-丙烯共聚物中。然后使EPM硫化橡胶经受UV（A）和热老化。基于变形能（K系数），OIT（氧诱导时间）的变化，确定了化合物在保护聚合物免受光降解和热氧化作用方面的抗氧化效率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号