A novel hydrophilic pyridinium salt polymer/SWCNTs composite film for high thermoelectric performance
A novel hydrophilic pyridinium salt polymer/SWCNTs composite film for high thermoelectric performance
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一种新型亲水吡啶盐聚合物/SWCNTs复合薄膜，具有高热电性能
DOI：
10.1016/j.polymer.2017.12.048
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发表时间：
2018-01
期刊：
影响因子：
4.6
通讯作者：
Chen Lidong
中科院分区：
文献类型：
--
作者：
Qu Sanyin;Yao Qin;Wang Liming;Hua Jianli;Chen Lidong
聚合物/碳纳米管复合材料在过去的十年中取得了很大的进展。然而，由于分散溶剂的高挥发性和较强的毒性，导致生产缺乏可规模性，因此迫切需要环境友好的工艺来扩大TE的应用。在本工作中，我们制备了一种新型的亲水性吡啶盐聚合物(记为P2)和单壁碳纳米管组成的有机-无机复合膜，用于热电应用。设计合成了一种新型的亲水性吡啶盐聚合物，该聚合物以吡啶盐为水溶基团，以噻吩基为共轭基团，使聚合物/碳纳米管复合膜实现电连接，从而改善其热电性能。为了进行比较，我们还合成了另一种不含噻吩基的吡啶盐聚合物(记为P1)。聚合物通过共轭基团与碳纳米管的π-π-电子之间的π共轭相互作用附着在碳纳米管表面。P2/CNT复合材料均匀分散在水溶液中，表现出比P1/CNT更好的分散行为，这可能是因为P2/CNT之间的接触作用比P1/CNT更强，这是因为聚合物P_2比P_1具有更高的电子离域性。当碳纳米管含量为50%时，P2/碳纳米管复合薄膜的电导率达到最大值，为159 S/cm。结果表明，P2/50%碳纳米管复合膜的功率因数为46.4W/mK2， μ/50%碳纳米管复合膜的功率因数最高。
Polymer/carbon nanotube composites have gained great progress in the past decade. However, the lack of scalability of production due to the relatively high volatility and strong toxicity of the dispersion solvent have created a great need for environmental friendly process for expanding TE applications. In this work, organic-inorganic composite films composed of a novel hydrophilic pyridinium salt polymer (noted asP2) and SWCNTs were prepared for thermoelectric application. The novel hydrophilic pyridinium salt polymer was designed and synthesized containing the pyridinium salt for aqueous dissolution and thiophenes as the conjugation group to make the polymer/CNT composite film electrical connecting, therefore improving the thermoelectric performance. Another pyridinium salt polymer (noted asP1) without thiophene group was also synthesized for the purpose of comparison. The polymers attach on the surface of CNTs through π-π conjugation interaction between conjugation groups and π-electrons of CNTs. TheP2/CNTcomposites were homogeneously dispersed in the aqueous solution, revealing better dispersion behavior thanP1/CNT, which is probably because of the stronger contact interaction betweenP2/CNT thanP1/CNT due to the higher electron delocalization of polymerP2thanP1. The electrical conductivity ofP2/CNT composite film reached the maximum value of 159 S/cm with 50% CNT content. Consequently, a high power factor of 46.4 μW/mK2was obtained for theP2/50%CNT composite film.
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