Citation: Fu-rong Li, Jian-ying Zhao, Hai-quan Guo, Lian-xun Gao. Enhanced Energy Storage Performance of Polyimide-based Nanocomposites by Introducing Two-dimensional Nanosheets[J]. Acta Polymerica Sinica, ;2020, 51(3): 295-302. doi: 10.11777/j.issn1000-3304.2019.19164 shu

Enhanced Energy Storage Performance of Polyimide-based Nanocomposites by Introducing Two-dimensional Nanosheets

1.
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049
2.
Laboratory of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: Jian-ying Zhao, jyzhaociac@163.com Hai-quan Guo, hqguo@ciac.ac.cn
Received Date: 6 September 2019
Revised Date: 11 October 2019

Increasing demands to improve the energy storage density of polymer dielectric materials have spurred the development of polymers with enhanced permittivity and improved dielectric breakdown. The introduction of high permittivity fillers can effectively improve the polymer permittivity, but it is also easy to cause the reduction of breakdown strength, which affected the improvement of the energy storage density of polymer materials. In this study, the polyimide-based nanocomposite films were fabricated via the in situ polymerization with high permittivity barium titanate (BT) nanoparticles and two-dimensional nanosheets exfoliatred from hydrotalcite (HT) as fillers . The permittivity of PI/BT films gradually increased with the increaseing content of BT nanoparticles. However, the breakdown strength decreased significantly with the increase of BT content. Therefore, the energy storage density of PI/BT composite films showed a remarkable decrease. However, with a small amount of two-dimensional nanosheets of hydrotalcite adding to the PI/BT composite films, the breakdown strength of the composites showed an obvious increase trend. The breakdown strength of the PI/BT film conntaining 30% BT increased by 32.8% when only 1% two-dimensional nanosheets were added. The improvement effect of two-dimensional nanometer sheet on the breakdown strength of PI/BT composite material is the same under different BT contents. Therefore, the penetration strength of PI/BT composite film can be effectively improved by adding two-dimensional nanocrystalline sheets, thus increasing the energy storage density. This is due to the fact that two-dimensional nanosheets can effectively improve the dispersion of high content nanoparticles in the polymer matrix, thus improving the properties of composites related to the dispersion of nanoparticles. Experimental results showed that by introducing two different morphology fillers, the permittivity and breakdown strength of PI/BT/HT composite films can be improved. With the addition of 20% BT and 1% HT, the energy storage density of PI/BT/HT composite film can reach 2.58 J/cm³, which is 14.6% higher than that of the composite film with only 20% BT. This method of simultaneously adding two different morphology fillers such as nano particles and two-dimensional nanosheets into the polymer matrix was expected to be applied in more fields of nanocomposite materials, especially in fields with high content of nano particles.
- Polyimide,
- Stored energy density,
- Permittivity,
- Breakdown strength,
- Layered double hydroxides
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沈阳化工大学材料科学与工程学院沈阳 110142