Polymerization in Magnetic Field. XIX. Thermal Behavior of the Copolymers of Methyl Methacrylate with Glycidyl Methacrylate Synthesized in the Magnetic Field Presence

Abstract

The paper evidences changes of thermal properties of poly(methyl methacrylate) as well as methyl methacry- late copolymers with glycidyl methacrylate (GMA) polymers synthesized classic and comparatively in a magnetic field. Samples of poly(methyl methacrylate) and methyl methacrylate copolymers with different amounts of GMA synthesized by radical emulsion polymerization with or without the presence of a continuous electro- magnetic field, they were thus compared. The thermal behavior was studied by Differential Scanning Calorimetry (DSC) and Thermogravimetry (TGA). The paper evidences the higher Tg as well as the higher thermal stability of the macromolecular chains structures synthe- sized in the presence of the electromagnetic field. analysis (TGA), were identified using a mass spectrometer attached to the TGA apparatus. They concluded that the presence of the second monomer (GMA) favors combination reactions rather than disproportionation as termination step. Thus, the copolymers degradation occurs only at high tem- peratures at which the polymers that have no terminal un- saturation degrade. This involves random scission followed by depropagation.