AbstractThe stimuli-responsive color-changing properties of functional polymers are applied to the development of sensing and imaging devices. Tuning the stimuli responsivity is required for a wide range of applications. Polydiacetylene (PDA) derivatives show color changes with the application of external stimuli, such as heat and mechanical stress. Our group has focused on the layered crystal structure of PDA and its intercalation chemistry. The original layered PDA shows an irreversible color transition from blue to red upon heating to the threshold temperature. Here, we found that alkyldiamine-intercalated PDA possessed different color-changing properties, such as a higher color transition temperature and a temperature-dependent and reversible color change, than the original PDA. As the alkyl-chain length increased, the color-changing behavior gradually converted from the irreversible color transition type to the reversible temperature-dependent one. Since the intercalated diamine had a stabilizing effect on the layered structure, the stimuli responsivity varied according to the type of diamine. The results suggest that the stimuli-responsive color-changing properties of layered PDA can be finely and systematically tuned by the intercalation of organic guests.Polydiacetylene (PDA) derivatives exhibit color change with application of external stimuli, such as heating and mechanical stress. The original layered PDA shows the irreversible color transition from blue to red with heating at the threshold temperature. Here we found that the alkyldiamine-intercalated PDA induced the different color-change properties, such as the raise of the color-transition temperature, the temperature-dependent color-change, and the reversible color change. The intercalated diamines have the stabilization effect of the layered polymer. The stimuli-responsive color-change properties can be tuned by the intercalated organic guests.

中文翻译：

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通过插层稳定层状聚二乙炔，出现温度依赖性和可逆变色特性

摘要 功能聚合物的刺激响应变色特性被应用于传感和成像设备的开发。广泛的应用需要调整刺激响应度。聚二乙炔 (PDA) 衍生物会随着外部刺激（例如热和机械应力）的应用而显示颜色变化。我们的团队专注于 PDA 的层状晶体结构及其嵌入化学。原始分层 PDA 在加热到阈值温度时显示出从蓝色到红色的不可逆颜色转变。在这里，我们发现嵌入烷基二胺的 PDA 与原始 PDA 相比具有不同的变色特性，例如更高的颜色转变温度和温度依赖性和可逆的颜色变化。随着烷基链长度的增加，变色行为逐渐从不可逆的颜色转变类型转变为可逆的温度依赖性。由于嵌入的二胺对层状结构具有稳定作用，刺激响应性根据二胺的类型而变化。结果表明，层状PDA的刺激响应变色特性可以通过有机客体的嵌入进行精细和系统地调整。聚二乙炔（PDA）衍生物随着外部刺激（如加热和机械应力）的应用而表现出颜色变化。原始的分层 PDA 显示了在阈值温度下加热时从蓝色到红色的不可逆颜色转变。在这里我们发现烷基二胺插入的 PDA 诱导了不同的颜色变化特性，如颜色转变温度的升高、温度相关的颜色变化和可逆的颜色变化。插层二胺具有层状聚合物的稳定作用。插入的有机客体可以调节刺激响应的变色特性。