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首页> 外文期刊>Journal of Applied Polymer Science >Investigations of chromatic transformations of polydiacetylene with aromatic compounds
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Investigations of chromatic transformations of polydiacetylene with aromatic compounds

机译：聚二乙炔与芳香族化合物的变色研究

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Thermochromic changes of 10,12-pentacosadiynoic acid (PCDA) were investigated in combination with four aromatic compounds, benzene, furan, thiophene, and cyclopentadiene, with subsequent exposure to UV radiation. Using Raman spectroscopy and solid-state Fluorometry, no differences were observed between benzene, furan, or thiophene from the PCDA itself, with respect to the blue to red color change, which took place from 80°C to 100°C. However, the addition of cyclopentadiene exhibited the color change at a significantly higher temperature, ranging from 180°C to 200°C. Lack of new products formed during the initial mixing period was ruled out by analysis using solid-state NMR MAS and differential scanning calorimetry (DSC), with only monomer peaks at 69.61°C for the PCDA and 72.37°C for PCDA in combination with cyclopentadiene, as recorded by the DSC. It is believed that a chemical bond between PCDA and cyclopentadiene is formed after polymerization from catalysis by the UV radiation. Solid-state NMR MAS revealed a chemical shift peak of 131.55 ppm for the PCDA and a much larger peak at 130.84 ppm for the PCDA and cyclopentadiene. The DSC exhibited melting point peaks at 193.26°C and 194.88°C for PCDA and PCDA with cyclopentadiene, respectively. Because the color change involves C?￡?C bond rotation of side groups, stressing π-bond overlap, the cyclopentadiene bond is thought to prevent rotation by steric hindrance until a higher temperature or melting occurs at the DSC stated temperature of 194.88°C.
机译：研究了10,12-戊二十碳二烯酸（PCDA）与四种芳香族化合物苯，呋喃，噻吩和环戊二烯的热致变色变化，随后暴露于紫外线辐射。使用拉曼光谱法和固态荧光法，在80°C至100°C的蓝色至红色变化方面，未发现PCDA本身的苯，呋喃或噻吩之间存在差异。然而，添加环戊二烯在明显更高的温度下显示出颜色变化，该温度为180℃至200℃。通过使用固态NMR MAS和差示扫描量热法（DSC）进行分析，排除了在初始混合阶段中缺乏新产物形成的情况，只有PCDA与环戊二烯组合的单体峰分别在69.61°C和72.37°C。 ，由DSC记录。据信，在聚合之后，通过UV辐射的催化，在PCDA和环戊二烯之间形成了化学键。固态NMR MAS揭示了PCDA的化学位移峰为131.55 ppm，PCDA和环戊二烯的峰为130.84 ppm。对于具有环戊二烯的PCDA和PCDA，DSC分别显示在193.26°C和194.88°C的熔点峰。因为颜色变化涉及侧基的C 1 -C 4 C键旋转，加重π键重叠，所以认为环戊二烯键可防止空间位阻旋转，直到在194.88℃的DSC温度下出现更高的温度或熔化为止。

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