从单晶转化为单晶的二烯衍生物在纳米晶体中的转化
Shu Takahashi1, Hirohiko Miura, Hitoshi Kasai
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University and CREST, Katahira, Aoba-ku, Sendai 980-8577, Japan.
Journal of the American Chemical Society
|September 13, 2002
概括
纳米晶体通过单晶转化为单晶的方法实现了拓化学聚合,与大量晶体不同的是,这些晶体会破裂. 这种方法在聚合甲基p-phenylenediacrylate和2,5-distyrylpyridine时保留了晶体结构.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 拓化学聚合提供了对聚合物结构的精确控制.
- 晶体缺陷和机械应力往往会破坏大量晶体中的聚合.
- 纳米晶体制备方法可以影响反应结果.
研究的目的:
- 为了研究纳米晶体中特定单体的拓化学 [2 + 2] 循环添加聚合.
- 为了比较纳米晶体与散体晶体的聚合行为.
- 为了确定纳米晶体在聚合过程中是否经历单晶到单晶的转化.
主要方法:
- 纳米晶体制备的沉方法.
- 拓化学 [2 + 2] 循环添加聚合.
- 进行X射线衍射分析,以监测晶体结构变化.
- 光学显微镜观察聚合过程中的晶体形态.
主要成果:
- 大量单晶在聚合过程中破裂成微晶.
- 甲基p-phenylenediacrylate和2,5-distyrylpyridine的纳米晶体表现出单晶到单晶的转化.
- 纳米晶体内的聚合过程在没有显著的结构完整性损失的情况下进行.
结论:
- 纳米晶体封闭在高化学聚合过程中保持结构完整性.
- 在纳米晶体中,单晶转化为单晶转化是控制聚合的可行途径.
- 这种方法为高排序的聚合物提供了一条途径,这种方法在散装晶体上是无法实现的.
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