Curing reactions in acetylene-terminated resins. Part 2.—Differential scanning calorimetric, thermal gravimetric and thermomechanical analytical study of catalysed cure of an aryl prop-2-ynyl ether-terminated monomer

Abstract

Differential scanning calorimetry (DSC) shows that the curing of the aryl prop-2-ynyl ether-terminated monomer(p-HCCCH₂OC₆H₄)₂CMe₂(1) in the presence of (PPh₃)₃RhCl, (η-Cp)Co(CO)₂, (η-Cp)₂Ni, (PPh₃)₂NiCl₂, or (PPh₃)₂PdCl₂, takes place at lower temperatures and with lower enthalpies of polymerization than in the absence of the catalysts. Thermal gravimetry (TG) and thermomechanical analysis (TMA) studies indicate that when the resulting resins are crosslinked in the presence of catalysts they are less thermally stable and have lower T_g values than does the uncatalysed resin, the latter having a particularly rigid structure. The thermal stabilities of the resins decrease with decreasing ability of the catalysts to promote cyclotrimerization.