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可共结晶聚合物的溶剂含量控制策略可实现无压力双向形状记忆效应,具有更广泛的使用温度

Qi Guo^1,2, Yaoming Zhang^1,2, Hongwei Ruan^1,2

¹Key Laboratory of Science and Technology on Wear and protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China.

Macromolecular rapid communications

|October 16, 2023

概括

研究人员开发了一种新的方法来改善形状记忆聚合物,用于更广泛的温度应用. 在光固化过程中控制溶剂含量可以增强无压力双向形状记忆效应,从而使材料具有更广泛的使用温度.

科学领域:

聚合物科学聚合物科学
材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.

背景情况:

在聚合物中实现无应力双向形状记忆 (TWSM) 效应的广泛响应温度范围仍然是一个挑战.
现有的形状记忆聚合物通常在它们的操作温度窗口中存在局限性,限制了它们的实际应用.

研究的目的:

开发一种新的策略,以增强共聚的无压力TWSM特性.
调查溶剂含量对光固化聚烯酸/聚烯酸/五烯酸共聚合物 (CPES) 的热力学和TWSM行为的影响.

主要方法:

在1,1,2-三乙烯 (TCA) 溶剂中对聚烯酸 (PCL) 和聚烯酸 (PPDL) 进行光固化,以制造交联聚 (CPES).
在光固化过程中溶剂含量 (SC) 的系统变化,以影响聚合物网络结构和特性.
热力学转变的表征 (融化转变,T_m) 和评估无压力TWSM性能,包括在不同高触发温度 (T_high) 中可逆应变.

主要成果:

高溶剂含量 (SC) 减少了聚合物链重叠,促进了PCL和PPDL的共同结晶,并引入了额外的融过渡 (T_m).
用高SC制备的CPES表现出增强的无压力TWSM效应,其特点是响应温度的范围更广,可逆应变的改善.
即使在升高的高触发温度下 (T_high),具有高SC的样本也保持了显著的可逆应变,表明形状恢复强.

结论:

在合聚合物的光固化过程中控制溶剂含量是增强无应力TWSM特性的一种有效策略.
这种方法产生了具有更广泛服务温度范围的高性能形状记忆聚合物.
该研究引入了一种新方法,用于准备先进的形状记忆材料,并探索新的聚合物结构.

关键词:

同结晶化同结晶化溶剂的含量溶剂的含量这是一个双向形状记忆的双向形状记忆.

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