Add time:08/05/2019         Source:sciencedirect.com

(2-Hydroxy-3-phenoxy)propyl methacrylate (PPMA) and (2-hydroxy-3-tetrahydrofurfuryloxy)propyl methacrylate (THPMA) were polymerised using benzoyl peroxide as initiator in 1,4-dioxane at 60 °C. The polymers were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), IR, 1H and 13C NMR techniques. The thermal degradations of poly(THPMA) and poly(PPMA) were investigated by thermogravimetric analysis (TGA) and programmed heating of the polymers from ambient to 500 °C under vacuum, followed by product collection, and using IR spectra of partially degraded polymer. IR, GC–MS, 1H and 13C NMR techniques were used in product identification studies. Although the heating of poly(THPMA) to 330 °C gives the monomer in ratio 87.0%, it gives the monomer in ratio 47.7% between 330 and 500 °C, whereas poly(PPMA) gives the monomer in ratio 85.9% during heating from ambient to 500 °C. Activation energies of the degradations given the corresponding monomers in ratio 85% at least, and the mechanism of degradation given some other major products, are discussed.

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