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首页> 外文期刊>Synthetic Metals >A comparative investigation between poly(l-ethynylpyrene) and poly(l,6-(3-ethynylpyrenylene)): Influence of the structure on the thermal, optical, electrochemical properties and conductivity
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A comparative investigation between poly(l-ethynylpyrene) and poly(l,6-(3-ethynylpyrenylene)): Influence of the structure on the thermal, optical, electrochemical properties and conductivity

机译：聚（1-乙炔基py）与聚（1,6-（3-乙炔基ren））的比较研究：结构对热，光学，电化学性质和电导率的影响

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A comparative investigation between trans-poly(l-ethynylpyrene) (rrans-PEP) obtained chemically and poly(l,6-(3-ethynylpyrenylene) (E-PEP) prepared electrochemically was carried out. Thermal and opti-cal properties of the polymers were studied by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and absorption spectroscopy. Electrochemical properties were evaluated by cyclic voltamperometry, in a 0.1 M Et_4NClO_44/THF solution at 10 mV/s, using a Pt disc as working electrode and Ag/AgCl as reference electrode. On the other hand, the conductivity of both polymers was measured in pressed pellet. Trans-PEP (T_(10) = 369 deg C) showed a higher thermal stability than its homologue E-PEP (T_(10) = 256 C). DSC of the polymers showed that trans-PEP exhibits a softening point at 330 deg C, whereas E-PEP does it at 117 deg C. Absorption spectra of the polymers revealed that trans-PEP exhibits two absorption bands at lambda = 336 nm and k = 580 nm due to the pyrene moieties and the highly conjugated polyacetylene main chain, respectively. By contrast, E-PEP showed only an absorption band at A = 358 nm followed by a tail, which reveals that this polymer possesses a lower degree of conjugation. Molecular modelling performed in short segments of these polymers confirmed this hypothesis. Regarding the electrochemical properties, trans-PEP showed an anodic peak at 1500 mV and a conductivity value sigma = 2.7 x 10~(-2) S/cm, whereas E-PEP exhibited an anodic oxidation peak at 1670 mVand sigma = 8.4 X 10~(-2) S/cm.
机译：对化学合成的反式聚（1-乙炔基py）（rrans-PEP）和电化学制备的聚（1,6-（3-乙炔基py）（E-PEP）进行了比较研究。通过热重分析（TGA），差示扫描量热法（DSC）和吸收光谱对聚合物进行了研究，并通过循环伏安法在10 mV / s的0.1 M Et_4NClO_44 / THF溶液中以Pt圆片作为工作电极，对电化学性能进行了评估。另一方面，在压制颗粒中测量了两种聚合物的电导率，Trans-PEP（T_（10）= 369℃）比其同系物E-PEP（T_ （10）= 256 C）。聚合物的DSC结果表明反式PEP在330℃时显示出软化点，而E-PEP在117℃时显示出软化点。由于the分子基团，λ= 336 nm和k = 580 nm处的能带es和高度共轭的聚乙炔主链。相比之下，E-PEP仅在A = 358 nm处显示吸收带，其后是一条尾巴，这表明该聚合物的共轭程度较低。在这些聚合物的短片段中进行的分子建模证实了这一假设。关于电化学性质，反式-PEP在1500 mV处显示一个阳极峰，电导率sigma = 2.7 x 10〜（-2）S / cm，而E-PEP在1670 mV处显示一个阳极氧化峰，sigma = 8.4 X 10约（-2）S / cm。

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