Improve the interfacial properties of carbon fiber reinforced epoxy resin composites by maleimide‐modified waterborne polyurethane sizing agent

Author:

Li Chengsen12,Gao Xueping12,Zhu Bo12ORCID,Yuan Xiaomin12,Qiu Zhijie12,Zhang Ye12,Yan Shuhan12

Affiliation:

1. Key Laboratory of Liquid‐Solid Structural Evolution and Processing of Materials of Ministry of Education, State Key Laboratory of Crystal Materials Shandong University Jinan Shandong China

2. Carbon Fiber Engineering Research Center, School of Materials Science and Engineering Shandong University Jinan Shandong China

Abstract

AbstractThe N‐(4‐hydroxyphenyl) maleimide (4‐HPM) modified waterborne polyurethane emulsions (MWPU) were used as surface sizing agents to improve the interfacial adhesion between carbon fibers (CF) and epoxy resin matrix. Dynamic light scattering (DLS), transmission electron microscope (TEM), and thermogravimetric analysis (TGA) showed the particle size distribution, storage stability, and thermal stability of the modified MWPU. And the surface reactivity of CF increased significantly after sizing. The interfacial shear strength (IFSS) and the interlaminar shear strength (ILSS) of CFREs were tested, and the fracture morphology was observed. The result showed that a continuous and uniform sizing layer is formed on the surface of CF. In particular, the comprehensive performance and interfacial modification effect of the MWPU emulsion outperformed other samples when the 4‐HPM content was 1.0 wt%. Compared with unsized carbon fibers, the IFSS and ILSS are up to 71.30% and 30.81% higher, respectively.

Funder

Key Technology Research and Development Program of Shandong

Natural Science Foundation of Shandong Province

Publisher

Wiley

Subject

Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry

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