Synthesis and physico-chemical studies of unsaturated polyester polyol of multifunctional epoxy resin containing s-triazine ring and its jute/glass composites

Abstract

Unsaturated polyester polyol of 2,4,6-tris (4-hydroxyphenyl)-1-3-5-triazine (ETPUP) was synthesized and styrene was added as a reactive diluent (ETPUPSt). The structure of ETPUP was supported by FTIR and 1H NMR spectroscopic techniques. ETPUP is thermally stable up to about 230 °C and followed multistep degradation reactions with 0.2–3.83 order kinetics leaving 48.9% residue at 700 °C confirming formation of highly thermally stable cross-linked product. Jute and glass composites of ETPUPSt were fabricated by hand lay-up technique followed by compression molding under 27.58 MPa pressure and at 100 °C for 4 h. J-ETPUPSt and G-ETPUPSt showed respectively 21.7 and 138.3 MPa tensile strength; 31.9 and 29.5 MPa flexural strength; 1.8 and 2.2 kV mm−1 electric strength; and 2.7 × 1014 and 2.1 × 1015 Ohm cm volume resistivity. Both J-ETPUPSt and G-ETPUPSt showed excellent hydrolytic stability even in harsh acidic and saline environments and also in boiling water. Observed equilibrium water content at 35 °C for J-ETPUPSt and G-ETPUPSt in water, 10% of aq NaCl, and 10% of aq HCl are 19, 16.3, and 21.3%; 9.2, 7.2, and 10.4%, respectively. Both the composites may be useful for load bearing housing units, and in electrical, electronic, and marine fields.