Abstract
ABSTRACTThis study focuses on the characterization of acrylic reactive mixtures designed for liquid composite molding (LCM) and yielding thermoplastic matrices for composite applications. Conversion degree, complex viscosity, and cure exothermicity are tracked during the radical polymerization. Results show that these systems suffer from Trommsdorff's effect, that is, the polymerization is highly exothermic. The rheological study also highlights a limit of injectability for LCM processes around a conversion degree of 10%. The vitrification curve, which correlates conversion degree to glass‐transition temperature, has been established for methyl methacrylate/poly(methyl methacrylate) mixtures. It constitutes a useful tool to identify the thermal conditions required to reach a full monomer conversion and thus, to manage the residual monomer content. The use of such acrylic‐based reactive solutions for fast LCM processing appears appropriate as fully polymerized matrices were obtained in less than 5 min at 90 °C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47391.
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