Large-tow carbon fibers coated an aqueous epoxy sizing agent to enhance interfacial interactions

Abstract

Large tow carbon fiber (LTCF) has excellent performance and low cost. However, there are still many difficulties in the application of LTCFs, among which the problem of interfacial penetration is mainly solved. Building interfaces with sizing structures of fiber composites is an effective approach to achieve high performance. In this article, a water-based epoxy sizing agent suitable for LTCF fiber thermoset composites was studied. A comparison of the five LTCFs in this study shows that the wettability and contact angle of the sized LTCFs are significantly improved. In addition, the interfacial shear strength (IFSS) and interlaminar shear strength (ILSS) increased from 52.3 to 71.0 MPa (35%) and 36.4 to 54.6 MPa (50%), respectively. Compared with other imported LTCFs, domestic large-size LTCFs have a wide variety and a large number of surface functional groups, thereby improving their wettability and covalent bonding with the resin matrix. This work has reference significance for the practical application and industrial production of LTCFRP.

Graphical abstract

Keywords:

• Large-tow carbon fiber
• epoxy
• sizing
• composites
• interface/interphase

Authors’ Contributions

Muhuo Yu: Conceptualization, Investigation, Analysis, Writing-Original draft preparation. Ruize Gao: Data analysis, Manuscript revision, Data curation, Writing-Reviewing. Liangliang Qi: Data analysis, Manuscript revision. Yuanrong Sun: Resources. Lele Cheng: Investigation. Zhonghao Mei: Methodology. Mingtao Sun: Methodology. Zeyu Sun: Resources, Project administration, Supervision.

Disclosure Statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.

Additional information

Funding

This work was supported by open project of the State Key Laboratory of Fiber Material Modification (KF2203). Science and Technology Committee of Shanghai Municipality (No. 19511106703). Fundamental Research Funds for the Central Universities (No. 2232020G-12).