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| Use of Polyurethane for Interface Control to Improve the Toughness of Carbon Paper |
| Received:January 08, 2025 Revised:February 20, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.08.006 |
| Key Words:carbon paper polyurethane toughness interface control |
| Fund Project:国家自然科学基金青年基金（22208069）；制浆造纸工程国家重点实验室（华南理工大学）开放基金资助项目（202404）；广东省教育厅重点领域项目（2024ZDZX3039）；松山湖材料实验室开放课题基金资助（2023SLABFN16）；广州市科技局基础研究计划市校（院）企联合资助项目（2025A03J3088）。 |
| Author Name | Affiliation | Postcode | | ZHAO Shuangshuang* | School of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | MENG Ling* | State Key Lab of Pulp & Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, Guangdong Province, 510006 | 510006 | | LI Hailong* | School of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | CHEN Dong | School of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:In order to improve the toughness of carbon paper （CP）， this study employed thermoplastic polyurethanes (TPU) to construct multi-layer interfaces during the CP molding process to reduce the interfacial bonding strength between carbon fiber and resin carbon. The results showed that TPU could fill the grooves on the surface of carbon fiber and reduce the surface roughness. With the increase of TPU content， the average pore size of CP increased， the surface conductivity remained basically unchanged， the surface roughness and fracture toughness showed a trend of increasing first and then decreasing. When the TPU mass fraction was 49.8%， the fracture toughness of CP increased by 99.8% compared with the unmodified CP， the average pore size increased by 35.2%， and the surface roughness reduced from 28.1 μm to 26.2 μm. The improvement in CP toughness was attributed to the energy dissipation caused by fiber pull-out and debonding. Under conditions of 100% relative humidity， the limiting current density and power density of a single cell reached 1.28 A/cm2 and 347.8 mW/cm2， respectively， achieving the fuel cell performance of commercial CP. |
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