具有垂直交叉连接梯度的聚合物凝板:非单调的驱动和对驱动动力学的离子特定影响
Fatih Puza1, Marc Christopher Thiel1, Yannic Wagner1
1Professur für Polymerwerkstoffe, Fachrichtung Materialwissenschaft und Werkstofftechnik, Universität des Saarlandes, Campus, 66123, Saarbrücken, Germany.
Macromolecular rapid communications
|November 21, 2023
概括
研究人员开发了聚合物水凝,表现出非单调的启动,即对单个刺激做出复杂的反应. 阳离子选择,就像化物或硫酸盐一样,精确地控制了这些先进的智能材料的执行速度和行为.
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
- 软机器人软机器人 软机器人软机器人
背景情况:
- 非单调的启动,即单个刺激引发多样化的反应,在自然界中很常见,但对合成材料来说具有挑战性.
- 开发能够进行复杂,刺激响应运动的合成系统对于智能材料和软机器人技术的进步至关重要.
研究的目的:
- 设计合成聚合物水凝,能够使用交联梯度进行非单调的激活.
- 调查特定离子对聚烯胺 (PAAm) 和聚二甲基胺 (PDMAA) 水凝的执行动力学和行为的影响.
主要方法:
- 通过热启动的自由基聚合,制造具有交联梯度的聚合物基板 (PAAm和PDMAA).
- 将水凝暴露在含有不同离子 (例如,化物,硫酸盐) 的水溶液中,以观察激活反应.
- 作为对不同离子环境的反应,作用动力学和膨胀行为的表征.
主要成果:
- 具有交叉链接梯度的聚烯胺基体显示出非单调的启动,滚入管子并重新在水性介质中打开.
- 驱动动力学是由离子调节的:化物加速了水化和驱动,而硫酸盐由于减少了聚合物水化而减缓了它.
- 聚甲基胺) 水凝在NaCl中表现出快速滚动,但重新开放缓慢,并且由于有限的胀,在Na2SO4中表现出适度的启动.
- 没有梯度的双层水凝表现出单调的启动,根据盐溶液可逆地改变形状 (在NaCl中关闭,在Na2SO4中打开).
结论:
- 聚合物水凝中的交联梯度是一种有效的策略,可以实现非单调的执行.
- 阴离子的特定离子效应提供了一个可调节的机制来控制水凝激活的速度和性质.
- 这些发现为设计复杂的,具有复杂动态行为的刺激响应合成材料提供了一条途径.
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