Synthesis and Characterization of New Thermosetting Polybenzoxazines with Other Functional Groups in the Network

ELANGENI GILLBERT; MARÍA EUGENIA TAVERNA; MARÍA FERNANDA DIESER; GRACIELA MORALES; SPONTON, MARISA; DIANA ESTENOZ

Simposio; XII Simposio Argentino de Polímeros 2017 (SAP); 2017

In this work, novel thermosetting systems based on multi- functional benzoxazines with improved mechanical and thermal properties respect to the conventional polybenzoxazine were developed. First, BzOH and BzPOH monomers were synthesized by reaction between phenol or bisphenol A, paraformaldehyde, and ethanolamine. Then, BzOH and BzPOH were functionalized with maleic anhydride using a stoichiometric ratio of oxazine:maleic anhydride to produce oligomers with acid functionality, named BzFA and BzPFA. The products were characterized by Nuclear Magnetic Resonance (NMR), Size-Exclusion Chromatography (SEC), and Fourier Transform Infrared Spectroscopy (FTIR). BzFA and BzPFA oligomers showed average molecular weights of 5000 g/mol and 50000 g/mol respectively. Mixtures between the new precursors synthesized and the conventional benzoxazine (BzBA) were prepared. The curing process was studied by FTIR and Differential Scanning Calorimetry (DSC), and mechanical, thermal, and morphological properties of the materials were also evaluated. Materials obtained exhibited better properties than conventional polybenzoxazine. SEM measurements indicated homogeneous material surfaces.