...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS Macro Letters >T-g Confinement Effect of Random Copolymers of 4-tert-Butylstyrene and 4-Acetoxystyrene with Different Compositions
【24h】

T-g Confinement Effect of Random Copolymers of 4-tert-Butylstyrene and 4-Acetoxystyrene with Different Compositions

机译：不同组合物的4-叔丁基苯乙烯和4-乙酰氧基苯乙烯随机共聚物的T-G矛盾效应

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

We observe that the T-g confinement effect of polymer films can saturate with polymer substrate interaction. Thickness dependences of the glass transition temperature, T-g(h(0)), of random copolymer films of 4-tert-butylstyrene (TBS) and 4-acetoxystyrene (AS) supported by silica (SiOx) were measured for different TBS concentrations, X-TBS. For 0 <= X-TBS <= 0.47, T-g(h(0)) displays identical enhancements, independent of X-TBS. For X-TBS > similar to 0.66; however, T-g(h(0)) decreases steadily with X-TBS. The X-TBS > 0.66 result is in keeping with expectations that TBS interacts less strongly with SiOx than AS does, and weaker polymer substrate interaction renders greater dominance of the air surface over substrate surface on T-g, and thereby T-g reduction. We propose that saturation in T-g(h(0)) found for X-TBS <= 0.47 is caused by the maximization in polymer-substrate-specific bond formation. Further experiments and a calculation support this proposition.
机译：我们观察到聚合物膜的T-G限制效果可以与聚合物底物相互作用饱和。 用二氧化硅（SiOx）负载的4-叔丁基苯乙烯（TBS）和4-乙酰苯乙烯（AS）的无规共聚物膜的玻璃化转变温度，Tg（H（0））的厚度依赖性针对不同的TBS浓度，X -TBS。 对于0 <= X-TBS <= 0.47，T-G（H（0））显示独立于X-TBS的相同增强功能。 对于X-TBS>类似于0.66; 然而，T-G（H（0））与X-TBS稳定地降低。 X-TBS> 0.66结果是为了保持TBS与SiOx相互作用而不是SiOx的预期，并且聚合物基板相互作用较弱使得在T-G上的基底表面上的空气表面的优势更大，从而减少T-G。 我们提出针对X-TBS <= 0.47发现的T-G（0））中的饱和度是由聚合物 - 基质特异性键形成的最大化引起的。 进一步的实验和计算支持这一命题。

著录项

  • 来源
    《ACS Macro Letters》 |2019年第10期|共5页
  • 作者

    Wang Tong; Yan Jinsong; Yuan Hailin; Xu Jianquan; Lam Ho Yi; Yu Xuanji; Lv Chao; Du Binyang; Tsui Ophelia K. C.;

  • 作者单位

    Hong Kong Univ Sci &

    Technol Dept Phys Clear Water Bay Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Dept Phys Clear Water Bay Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Dept Phys Clear Water Bay Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Dept Phys Clear Water Bay Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Dept Chem &

    Biol Engn Clear Water Bay Hong Kong Peoples R China;

    Boston Univ Div Mat Sci &

    Engn Boston MA 02215 USA;

    Zhejiang Univ Dept Polymer Sci &

    Engn Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn Hangzhou 310027 Zhejiang Peoples R China;

    Hong Kong Univ Sci &

    Technol Dept Phys Clear Water Bay Hong Kong Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
  • 关键词

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