Journal
POLYMER
Volume 192, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.122327
Keywords
Polymer-matrix composites; Low energy electron beam curing; Microwave irradiation; Interfacial property
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Funding
- National Key Technologies R&D Program of China [2016YFB1100902]
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In this study, the transverse electric microwave (MW) mode TE10 was applied on a single layer of unidirectional prepreg before stepwise electron beam (E-Beam) curing, and the interfacial adhesion enhancement mechanism was investigated. The interaction between MW with carbon fiber (CF) and polymer was simulated by the Floquet unit cell method for periodic structures at a 2450 MHz frequency. For absorbing the most MW energy, the CF must be oriented perpendicular to electric field. On this condition, the fibre/matrix interface was improved owing to increased fibre surface roughness, decreased resin viscosity and the electrically driven polymer intermolecular interaction. The MW irradiation is considered to have a co-irradiation grafting effect on the fibres in the prepreg, increasing their surface roughness and energy with further increase in wettability. This enhanced fibre/matrix interfacial bonding during the E-Beam curing process. Experimental data showed that the interfacial shear strength (IFSS) increased by more than 31% after 180 s of MW exposure, while the interlaminar shear strength (ILSS) improved by 22% after 90 s; excessive irradiation reduces the beneficial effect and might damage the actual fibre strength.
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