This article describes the dispersed-phase toughening of thermoset matrices by the development of multiphase-structure thermosetting matrices using rubber and/or thermoplastic materials. It discusses two main methods for manufacturing prepregs, namely, single-pass impregnation and double-pass impregnation. The article illustrates reflected-light optical microscopy techniques to evaluate the morphology of thermoplastic materials for determining the material quality and correlating key microstructural features with material performance.
Brian S. Hayes, Luther M. Gammon, Toughening Methods for Thermoset-Matrix Composites, Metallography and Microstructures, Vol 9, ASM Handbook, Edited By George F. Vander Voort, ASM International, 2004, https://doi.org/10.31399/asm.hb.v09.a0009080
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