ENHANCEMENT OF GLASS TRANSITION TEMPERATURE OF POLY(METHYL METHACRYLATE)

摘要

Glass transition temperature (Tg) is an important and fundamental property of a polymer, which determines its service temperature as well as potential application. Poly(methyl methacrylate) (PMMA) is a thermoplastic resin with good transparency and lightweight. Thus it is expected to replace an inorganic glass in the near future. However, low Tg around at 100 oC limits its application in several fields. In this study, a new approach to enhance Tg is proposed without losing flowability. A specific salt with low lattice energy, i.e., lithium trifluoromethanesulfonate was added into PMMA by the solution blend technique. It was found that the salt addition greatly enhances Tg without scarifying its transparency. The Tg enhancement is presumably attributed to the electrostatic interaction between Li-cation and carbonyl group. Moreover, the blend shows rheological terminal (flow) region clearly, demonstrating that the blend can be processed by the conventional processing operation for a thermoplastic resin.