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Enhanced permittivity in polymer blends via tailoring the orderliness of semiconductive liquid crystalline polymers and intermolecular interactions

Abstract

Dielectric polymer blends has attracting extensive attention in the modern electric power supply and renewable energy systems due to well processability, high flexible and light weight. However, it is the challenge to improve the dielectric constant of polymer blends. In this work, three kinds of p-type semiconductor side-chain triphenylene discotic liquid crystalline polymers, homopolymer (PHT), copolymer (PHT-co-P9F) and blockpolymer (PHT-b-P9F), were synthesized by traditional radical polymerization and reversible-addition–fragmentation chain transfer method, in which PHT is poly{2-[3,6,7,10,11-pentakis(hexyloxy)-2-oxytriphenylene] methacrylate} and P9F is poly[2-(perfluorobutyl) ethyl methacrylate]. Polymer alloy films were fabricated by blending three polymers with PVDF in solution respectively. The compatibility and dielectric properties of a series of polymer alloys were studied. The results show that the dielectric properties of polymer blends are related to the orderliness of PHT and the compatibility between PHT and PVDF. Among the three kinds of polymer blends, the compatibility between PHT-b-P9F and PVDF is the best because the F-H bonding is formed between P9F and PVDF, which greatly improves the dielectric properties of PHT-b-P9F/PVDF polymer alloys. At the content of 50 wt%. PHT-b-P9F, the maximum dielectric constant of PHT-b-P9F/PVDF under 100 Hz is 35.5, which is 4.23 times higher than that of pure PVDF. Besides, compared with the other two polymer alloys, the dielectric loss and conductivity of PHT-b-P9F/PVDF polymer alloys have no obvious change. As for the PHT-co-P9F/ PVDF blends films, they presented the lowest dielectric constant own to the lowest orderliness of copolymer. These experimental results can be explained by the interfacial polarization which is associated with the interfacial area and charge carriers density. This study not only provides a new approach to synthesize the high property of dielectric polymer blends, but also enable a deeper understanding of the effect of interfacial polarization on the dielectric performance.

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Supplementary files

Article information


Submitted
14 Feb 2020
Accepted
13 May 2020
First published
15 May 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Communication

Enhanced permittivity in polymer blends via tailoring the orderliness of semiconductive liquid crystalline polymers and intermolecular interactions

K. Qian, R. Qiao, S. Chen, H. Luo and D. Zhang, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC00766H

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