The degradation and glass transition temperatures of a series of methyl methacrylate (MMA)-ethyl 0t-hydroxymethylacrylate (EHMA) copolymers have been studied by t.g.a./i.r, and d.s.c. Thermal degradation yielded intramolecular lactone and intermolecular crosslinking formation, with concurrent loss of ethanol and/or methanol involving adjacent or near-neighbour EHMA or MMA units. Glass transitions of copolymers have been analysed as a function of sequence distribution and their values compared to the theoretical ones derived using Johnston's equation. The partially degraded copolymers increased their glass transition temperatures as a consequence of the above mentioned lactone and crosslinking formation.
Посилання на статтю:
Thermal properties of ethyl ~-hydroxymethylacrylate-methyl methacrylate copolymers / M. Fernandez-Garcia and E. L. Madruga and R. Cuervo-Rodriguez and M. C. Fernandez-Monreal // Polymer. – 1994. – Vol 35. – P. 4474-4478.