项目名称: 共轭型高分子聚1,3,4-噁二唑的紫外老化及降解机理研究
项目编号: No.51303150
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 一般工业技术
项目作者: 杨潇
作者单位: 西南大学
项目金额: 20万元
中文摘要: 本项目拟研究含有噁二唑五元杂环的共轭型大分子芳香族聚1,3,4-噁二唑(p-POD)膜/纤维的紫外老化行为及降解机理。通过ATR-FTIR及XPS等表征手段,对POD在光老化过程中的表面分子官能团的动态变化进行跟踪监测。对老化过程中形成的各种新基团(尤其是羰基)进行详细分析表征,以期探索出光老化前后POD分子结构的变化以及可能发生的光化学反应。采用模板化合物的思路探索POD的光降解机理。利用TEMP和DMPO对单线态氧及超氧基阴离子的专一反应,运用ESR研究氧在光解过程中的可能作用形式和机制。进一步,对具有不同取代基的模板化合物,运用紫外吸收光谱、闪光光解等手段研究其吸/供电子基团对光分解的影响。
中文关键词: 聚1;3;4-噁二唑;光降解;光老化;光稳定;超氧基阴离子
英文摘要: The project studies the UV-aging and degradation mechanism of conjugated aromatic POD fiber/membrane containing aromatic and oxadiazole rings in its macromolecular chain. The changes of surface molecular structure of POD will be monitored and analyzed in detail through using ATR-FTIR and XPS, etc. Every kind of new generated functional groups, especially various carbonyls, will be characterized in detail, in order to explore the molecular structure changes of POD and possible photoreaction before and after UV-irradiation. Template-compound will be used to explore the degradation mechanism of POD. ESR characterization method helps to study the action mode of oxygen during UV-aging, through using TEMP and DMPO which only react with singlet oxygen and superoxide radical anion, respectively. UV-spectra and flash-photolysis are used to study the effect of withdrawing/donating electron groups contained in template-compounds during photolysis process.
英文关键词: poly(1;3;4-oxadiazole)s;photodegradation;photo-aging;photostability;superoxide anion