• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Structural changes on nanometric level in copolymers of methyl methacrylate with benzyl methacrylate as investigated by low frequency Raman scattering and small angle X-ray scattering
【24h】

Structural changes on nanometric level in copolymers of methyl methacrylate with benzyl methacrylate as investigated by low frequency Raman scattering and small angle X-ray scattering

机译：低频拉曼散射和小角度X射线散射研究了甲基丙烯酸甲酯与甲基丙烯酸苄酯的共聚物的纳米级结构变化

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

The effect of the physical aging performed close to the glass transition temperature on the amorphous structure of polymers at the nanometric level was investigated in poly(benzyl methacrylate), poly(methyl methacrylate) and random copolymers of methyl methacrylate and benzyl methacrylate. Low frequency Raman scattering and small angle X-ray scattering, were applied in a convergent analysis. Additionally, differential scanning calorimetry was used to evaluate the changes of enthalpy caused by physical aging. The low frequency Raman scattering spectra have been analyzed in a frame of the model of non-continuous structure of amorphous polymers. The results suggest that the structure of the investigated homopolymers becomes more cohesive and more homogeneous at the nanoscale after the aging, while in the case of the copolymers the enhancement of the heterogeneity and a phase separation occur. The small angle X-ray scattering results revealed the increase of the electron density fluctuations with aging in investigated copolymers' systems. DSC measurements revealed in each case single glass transition processes, with an endothermic peak resulting from enthalpy relaxation during aging. (c) 2006 Elsevier B.V. All rights reserved.
机译：在聚甲基丙烯酸苄酯，聚甲基丙烯酸甲酯和甲基丙烯酸甲酯与甲基丙烯酸苄酯的无规共聚物中，研究了接近玻璃化转变温度的物理老化对聚合物在纳米级无定形结构的影响。在收敛分析中应用了低频拉曼散射和小角度X射线散射。另外，差示扫描量热法用于评估由物理老化引起的焓的变化。在非晶聚合物非连续结构模型的框架内分析了低频拉曼散射光谱。结果表明，老化后，所研究的均聚物的结构在纳米尺度上变得更有凝聚力和更均匀，而在共聚物的情况下，发生了非均质性的增强和相分离。小角度X射线散射结果表明，在研究的共聚物体系中，电子密度波动随老化而增加。 DSC测量表明在每种情况下都是单一的玻璃化转变过程，其吸热峰是由于老化过程中的焓松弛而产生的。 （c）2006 Elsevier B.V.保留所有权利。

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