Abstract
2-Hydroxypropyl methacrylate (HPMA) was polymerized in the presence of AIBN at 60 °C. The thermal degradation behaviour of poly(HPMA) has been studied using thermogravimetry (TG), the IR examination of the partially degraded polymer, and a single line vacuum system consisting of a degradation tube, with a condenser for product collection and a gas phase IR cell. The cold ring fraction (CRF) was collected at two different temperatures, one of them (CRF1) is from ambient temperature to 340 °C and the other (CRF2) in the range 340–450 °C. The volatile products of the degradation were trapped at −196 °C (in liquid nitrogen). All fractions of the degradation were investigated by means of IR, 1H- and 13C-NMR techniques and the CRFs were also characterized by GC–MS. As major products of the degradation, the monomer, 2-propanal, methacrylic acid, 1,2-propandiol, 2-(2-propenyloxy)propyl methacrylate, 2-hydroxpropanal, and hydroxymethyl isopropyl ether were detected. Degradation mechanism and the origins of the identified products are discussed.
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