Abstract
The influence of epoxy active diluents, 1,4-butanediol diglycidyl ether (BD) and furfuryl glycidyl ether (FUR), in the mixtures with benzoxazine monomer based on bisphenol A, formaldehyde and m-toluidine (BA-mt), on the properties of a matrix was disclosed in this work. Resins were modified to achieve good tackiness at room temperature and reduced viscosity. The influence of mono- and difunctional modifiers on the process of curing was studied by way of differential scanning calorimetry and oscillatory rheology. The addition of BD and FUR shifted the curing peak to higher temperatures and significantly reduced viscosity. Preferable tackiness at ambient temperature was achieved with 10 phr of epoxy components in mixtures. However, cured blends with difunctional epoxy BD had an advantage over monofunctional FUR in enhanced tensile strength with remaining glass transition temperature at the level of neat benzoxazine (217 °C).
Highlights
Copolymers with Mono- and Keywords: benzoxazine; epoxy active diluents; benzoxazine curing; oscillatory rheology; furfuryl glycidyl ether
A further increase of butanediol diglycidyl ether (BD) concentration led to an increase of glass temperature to the level of 217 °C. We propose that this happened due to the copolymerization and difunctional epoxy resulting in a rigid polymer that this happened dueoftobenzoxazine the copolymerization of benzoxazine and difunctional epoxy network
This work disclosed that 1,4-butanediol diglycidyl ether (BD) and furfuryl glycidyl ether (FUR) in compositions with benzoxazine monomer BA-mt yielded improved tackiness of blends, reduced viscosity and higher temperature of curing
Summary
Copolymers with Mono- and Keywords: benzoxazine; epoxy active diluents; benzoxazine curing; oscillatory rheology; furfuryl glycidyl ether. One of the main disadvantages of PCM is their high flammability due to the organic nature of the matrix [1,2,3]. This reason limits the wider application of PMC in the transport interior industry. Benzoxazines have been developed as a new class of resins for PCM that appeared on the market at the beginning of the 21st century [4]. This is an addition-type phenolformaldehyde resin rather than a condensation type. Benzoxazine monomers are a promising basis for creating resins that fit the requirements of different PCM technologies such as prepreg, RTM (Resin Transfer Molding), Academic Editor: Francesco Tornabene
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