Study on phenolic resin/unsaturated polyester/graphite/composites for bipolar plate

doi:10.19491/j.issn.1001-9278.2024.10.002

Abstract

Abstract:

In this study， the bipolar plate composites were prepared by using a compression⁃molding technology using natural flake graphite （NG） as conductive aggregate， phenolic resin （PF） and unsaturated polyester resin （UPR） as binders. The effects of the mass ratio of PF to UPR， resin content， and molding conditions on the electrical conductivity and bending strength of the composites were studied by differential scanning calorimetry. The results indicated that the bipolar plate composites obtained an electrical conductivity of 336.1 S/cm and bending strength of 46.5 MPa at a resin content of 20 wt% with a NG/PF/UPR mass ratio of 6∶1， a pressing temperature of 100 ºC， a molding pressure of 30 MPa， a molding temperature of 180 ºC， and a molding time of 2 h. Compared to the NG/PF bipolar plate composite under the same processing conditions， the NG/PF/UPR bipolar plate composites exhibited an increase in electrical conductivity by 134.9 % and in bending strength by 21.2 %.

Key words: natural flake graphite, phenolic resin, unsaturated polyester resin, electrical conductivity, bending strength

CLC Number:

TQ323.4

LI Hang, DU Lingzhi, WU Xiaolin, FENG Qiao, LI Guili. Study on phenolic resin/unsaturated polyester/graphite/composites for bipolar plate[J]. China Plastics, 2024, 38(10): 5-9.

Figures/Tables 8

Fig.1. Experimental numerical fitting curves of electrical conductivity and mechanical strength of NG/PF/UPR bipolar plate composites with different mass ratios of PF and UPR

Fig.2. Synthesis principle of UPR and PF

Fig.3. Conductivity and bending strength of composites with PF∶UPR mass ratio of 3∶1 and 6∶1 at different resin contents

Fig.4. Conductivity and bending strength of composites with resin content of 20 % and PF∶UPR mass ratio of 6∶1 under different molding pressure

Fig.5. SEM cross⁃section of composite materials with different molding pressure

Fig.6. Conductivity and bending strength of composites with resin content of 20 % and PF∶UPR mass ratio of 6∶1 at different molding temperature

Fig.7. DSC curves of composites with resin content of 20 % and PF∶UPR mass ratio of 6∶1 at different molding temperatures T0

Fig.8. Conductivity and bending strength of composites with resin content of 20 % and PF∶UPR mass ratio of 6∶1 under different molding time

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