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1,2-二甲醇衍生动态,共价材料:合作自组装和可逆交叉连接

Xiangyi Zhang¹, Robert M Waymouth¹

¹Department of Chemistry, Stanford University , Stanford, California 94305, United States.

Journal of the American Chemical Society

|March 1, 2017

概括

使用dithiolane聚合物创建了响应性的水凝. 狄奥兰的类型显著影响水凝的特性,使可调节的动态和自愈材料从块共聚物中产生.

科学领域:

聚合物化学
材料科学
超分子化学

背景情况:

含有丁醇的聚合物为动态和响应性材料提供了途径.
用聚乙烯氧化物和聚碳酸合成了ABAtriblock共聚物.
在聚碳酸块中加入了悬挂式1,2-dithiolane功能.

研究的目的:

为了研究dithiolane功能化的ABAtriblock共聚物的自组和凝行为.
阐明醇诱导的环开聚合和交联的机制.
为了了解dithiolane结构如何影响水凝的特性.

主要方法:

两块共聚物的合成和表征.
用于微粒结构分析的小角度X射线散射 (SAXS).
用于研究凝和机械性能的风学测量.
对二醇环开放聚合物的动力学和热力学研究.

主要成果:

两块共聚物在水溶液中自组成桥梁式花.
添加硫醇会触发二醇环开放聚合,导致交联和凝形成.
来自甲基酸的水凝具有动态,自我愈合的特性.
来自脂酸的水凝是刚性,弹性和脆性的.
显著不同的水凝特性与特定的dithiolane的环开聚合的热力学和动力学有关.

结论:

1,2-dithiolane的功能结构决定了产生的水凝的动态和机械特性.
具有狄奥兰基的ABA三环共聚物为设计可调节,响应的水凝提供了多功能平台.
结合不同的迪醇单体,可以精确控制水凝特性,从高度动态到刚性材料.

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