低温热致变色聚二乙炔：设计，比色特性和纳米纤维形成,Macromolecules

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低温热致变色聚二乙炔：设计，比色特性和纳米纤维形成
Macromolecules ( IF 5.1 ) Pub Date : 2016-02-05 00:00:00 , DOI: 10.1021/acs.macromol.5b02683
In Sung Park ₁ , Hye Jin Park ₁ , Woomin Jeong ₁ , Jihye Nam ₁ , Youngjong Kang ₁ , Kayeong Shin ₁ , Hoeil Chung ₁ , Jong-Man Kim ₁

Affiliation

由于其刺激响应的颜色变化特性，聚二乙炔（PDA）已作为色度传感器得到了广泛的研究。PDA的热变色特性一直是许多研究的重点，这些研究不仅旨在获得对颜色变化的物理基础的基本了解，而且还旨在开发作为温度传感器的实际应用。PDA聚合物的热致变色转变温度与相应的二乙炔（DA）单体的熔点密切相关。另外，迄今为止描述的大多数PDA在高于室温的温度下经历蓝到红的颜色变化，因为PDA通常衍生自熔点高于室温的DA单体。在目前的研究中我们开发了一系列低温比色法PDA，其设计基于以下理由，即去除强头基相互作用的来源将降低相应DA单体的熔点。该策略用于设计和制造PDA传感器，该传感器显示5–30°C范围内的颜色过渡。此外，发现PDA的热致变色转变温度降低了约20℃。当DA单体中的烷基链长度被两个亚甲基单元截短时，温度为10°C。FTIR和拉曼光谱分析的结果表明PDA烷基链采用该策略用于设计和制造PDA传感器，该传感器显示5–30°C范围内的颜色过渡。此外，发现PDA的热致变色转变温度降低了约20℃。当DA单体中的烷基链长度被两个亚甲基单元截短时，温度为10°C。FTIR和拉曼光谱分析的结果表明PDA烷基链采用该策略用于设计和制造PDA传感器，该传感器显示5–30°C范围内的颜色过渡。此外，发现PDA的热致变色转变温度降低了约20℃。当DA单体中的烷基链长度被两个亚甲基单元截短时，温度为10°C。FTIR和拉曼光谱分析的结果表明PDA烷基链采用蓝相的全反式构象和一些gauche形式存在于红相PDA的烷基链中。最后，新的PDA在高达300°C的温度下仍保持稳定，并且其可加工的特性使它们能够通过采用阳极氧化铝（AAO）膜作为模板以纳米纤维形式制造。

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Low Temperature Thermochromic Polydiacetylenes: Design, Colorimetric Properties, and Nanofiber Formation

Owing to their stimulus responsive color changing properties, polydiacetylenes (PDAs) have been extensively investigated as colorimetric sensors. Thermochromic properties of PDAs have been the central focus of a number of investigations that were aimed not only at gaining a fundamental understanding of the physical basis of the color change but also at developing practical applications as temperature sensors. The thermochromic transition temperature of a PDA polymer is closely related to the melting point of the corresponding diacetylene (DA) monomer. In addition, the majority of PDAs described to date undergo a blue-to-red color change above room temperature because PDAs are generally derived from DA monomers that have melting points above room temperature. In the current study, we developed a series of low temperature colorimetric PDAs that were designed based on the reasoning that removal of the sources for strong headgroup interactions would lower the melting points of the corresponding DA monomers. This strategy was used to design and fabrication of PDA sensors that display color transitions in the range of 5–30 °C. Moreover, the thermochromic transition temperatures of the PDAs were found to decrease by ca. 10 °C when the alkyl chain length in the DA monomer is truncated by two methylene units. The results of FTIR and Raman spectroscopic analyses suggest that the PDA alkyl chain adopts an all-trans conformation in the blue-phase and some gauche forms exist in the alkyl chain in the red-phase PDA. Finally, the new PDAs are stable up to 300 °C, and their processable nature enables them to be fabricated in nanofiber forms by employing an anodized aluminum oxide (AAO) membrane as a template.

更新日期：2016-02-05

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