The amine:epoxide ratio at the interface of a glass fibre/epoxy matrix system and its influence on the interfacial shear strength

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Petersen, H. N. and Minty, R. F. and Thomason, J. L. and Yang, L. and Kusano, Y. and Brønsted, P. and Almdal, K. (2018) The amine:epoxide ratio at the interface of a glass fibre/epoxy matrix system and its influence on the interfacial shear strength. Composite Interfaces. pp. 1-13. ISSN 0927-6440 (https://doi.org/10.1080/09276440.2018.1511107)

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Abstract

The interfacial shear strength (IFSS) is commonly used for evaluating the adhesion at the interface between fibre and matrix. A glass fibre/epoxy matrix system was investigated. The surface coatings applied to glass fibres may result in a discrepancy in the amine:epoxide group ratio between the interface and the bulk matrix, consequently moving the ratio away from the optimum stoichiometric ratio most often used. The amine:epoxide group ratio in the matrix was varied to obtain the optimum ratio at the interface. The study found that the amine:epoxide ratio influenced the IFSS with an optimum just below the stoichiometric ratio. The microbond test was conducted in a thermal mechanical analyser (TMA) to determine the IFSS thus revealing an inverse dependency on the testing temperature: an increased testing temperature yields a decrease of IFSS. IFSS determined at temperatures below the glass transition temperature displays a decreasing trend at high amine:epoxide ratio whereas IFSS measured at testing temperatures above the glass transition temperature steadily increases as the amine:epoxide ratio increases. The microbond test was conducted using both a tensile tester and a TMA setup. The two microbond test setups yielded results with same behaviour of the IFSS as a function of the amine:epoxide ratio.

ORCID iDs

Petersen, H. N., Minty, R. F. ORCID logoORCID: https://orcid.org/0000-0002-3729-5215, Thomason, J. L. ORCID logoORCID: https://orcid.org/0000-0003-0868-3793, Yang, L. ORCID logoORCID: https://orcid.org/0000-0001-8475-1757, Kusano, Y., Brønsted, P. and Almdal, K.;
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