• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Study of conformational changes in poly(3-dodecylthiophene) dependent on backbone stereoregularity using a spin-probe technique
【24h】

Study of conformational changes in poly(3-dodecylthiophene) dependent on backbone stereoregularity using a spin-probe technique

机译：使用自旋探针技术研究聚（3-十二烷基噻吩）依赖于骨架立体规则性的构象变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Poly(3-dodecylthiophene) (P3DDT), with different amounts of head-to-head configuration defects, was characterized by ultraviolet-visible, H-1-NMR, photoluminescence, and Raman spectra. The heat-induced conformational sample changes were studied by electron paramagnetic resonance (EPR). For the study of these changes, a spin-probe technique was used, in which 5-doxyl-stearic acid methyl ester was applied as a spin probe. From the EPR spin-probe spectra, rotational correlation times and order parameters were calculated. The heat-induced conformational changes of P3DDT were accompanied by a monotonic decrease in the rotational correlation time up to approximately -33degreesC (240 K) and then by an increase in the range of the glass-transition temperatures, with the maximum being near room temperature and depending on the effective conjugation length. Afterward, the rotational correlation times had a decreasing tendency up to 90degreesC (363 K). (C) 2003 Wiley Periodicals, Inc. [References: 31]
机译：聚（3-十二烷基噻吩）（P3DDT）具有不同数量的头对头构型缺陷，其特征在于紫外可见，H-1-NMR，光致发光和拉曼光谱。通过电子顺磁共振（EPR）研究了热诱导的构象样品变化。为了研究这些变化，使用了旋转探针技术，其中将5-doxyl-硬脂酸甲酯用作旋转探针。根据EPR自旋探针谱，计算了旋转相关时间和有序参数。 P3DDT的热诱导构象变化伴随旋转相关时间单调减少，直至约-33摄氏度（240 K），然后玻璃化转变温度范围增加，最大接近室温。并取决于有效的共轭长度。此后，旋转相关时间直到90摄氏度（363 K）都有下降的趋势。 （C）2003 Wiley Periodicals，Inc. [参考：31]

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