Influence of isocyanate index on the mechanical and dielectric properties of polyurea

Yujiu Zhou; Yuetao Zhao; Wenyao Yang; Xin He; Xiling Mao; Yajie Yang; Jianhua Xu

doi:10.1117/12.2506334

8 February 2019 Influence of isocyanate index on the mechanical and dielectric properties of polyurea

Yujiu Zhou, Yuetao Zhao, Wenyao Yang, Xin He, Xiling Mao, Yajie Yang, Jianhua Xu

Proceedings Volume 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging; 108430Q (2019) https://doi.org/10.1117/12.2506334
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

Polymer materials are preferred to show a high advantage for electrostatic capacitors energy storage and pulsed power applications. In this work, a linear material, aromatic polyurea, has been successfully synthesized by stepwise polycondensation, then films with different isocyanate index of 1.00, 1.03, 1.06 and 1.09 were prepared. The Young’s modulus increases with the increase of isocyanate index, which means that film with higher isocyanate index presents better mechanical property. The dielectric permittivity of samples with isocyanate index of 1.03, 1.06 and 1.09 are 3.72, 3.63, 3.79 respectively, more than 1.5 times high than Biaxially Oriented Polypropylene (BOPP). Film with isocyanate index of 1.06 presents highest energy storage efficiency because of the complete reaction and lower reaction monomer residual, which can be proved by FTIR and the dielectric loss. At 3000 kV/cm electric filed, sample with isocyanate index of 1.06 still shows a very high energy storage efficiency of 89%. Considering the comprehensive property, polyurea film with isocyanate index of 1.06 is promising for high performance pulse capacitors application.

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Yujiu Zhou, Yuetao Zhao, Wenyao Yang, Xin He, Xiling Mao, Yajie Yang, and Jianhua Xu "Influence of isocyanate index on the mechanical and dielectric properties of polyurea", Proc. SPIE 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging, 108430Q (8 February 2019); https://doi.org/10.1117/12.2506334

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