Characterization and degradation of the poly(methylphenylsiloxane)-poly(methyl methacrylate) graft copolymer

Abstract

Poly(methylphenylsiloxane)–poly(methyl methacrylate) graft copolymers (PSXE‐g‐PMMA) were prepared by condensation reaction of poly(methylphenylsiloxane)‐containing epoxy resin (PSXE) with carboxyl‐terminated poly(methyl methacrylate) (PMMA), and they were characterized by gel permeation chromatography (GPC), infrared (IR), and 29Si and 13C nuclear magnetic resonance (NMR). The microstructure of the PSXE‐g‐PMMA graft copolymer was investigated by proton spin–spin relaxation T2 measurements. The thermal stability and apparent activation energy for thermal degradation of these copolymers were studied by thermogravimetry and compared with unmodified PMMA. The incorporation of poly(methylphenylsiloxane) segments in graft copolymers improved thermal stability of PMMA and enhanced the activation energy for thermal degradation of PMMA. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2521–2530, 1998

Nanocomposites of poly(methyl methacrylate) and organically modified layered silicates by melt intercalation

“…There are two peaks at 334 and 427°C in the nitrogen atmosphere and at 275 and 370°C in air. Because the first peak is very weak, the main process observed in the PMMA samples studied would thus be higher temperature random scission 34. The difference for the samples studied in air and nitrogen atmospheres is simply a shift in the temperature at which this primary mass loss occurs.…”

“…Two main reaction stages, which are reflected in two peaks in differential weight‐loss curves (DTG), have been reported. The first reaction stage (200–300°C) is chain‐end‐initiated,33 and the second (310–477°C) occurs by random scission 34. PMMA chain connectively is almost completely destroyed at 450°C,35 the primary degradation products being CO, CO 2 , CH 3 OH and CH 4 36…”

Syntheses of poly(methyl methacrylate)/poly(dimethyl siloxane) graft copolymers and their surface enrichment of their blend with acrylate adhesive copolymers

“…The surface segregation behavior of block or graft copolymers is very important in fields of adhesive, coating, lubricants, and surface modification 1–5. The surface segregations of copolymers or their blends are derived by the components with low‐surface tension, such as Si‐containing or F‐containing copolymers.…”

Organic-inorganic hybrid materials. V. Dynamics and degradation of poly(methyl methacrylate) silica hybrids

“…Using silicones for modification can reduce the deficiency of PMMA. The incorporation of silicones into PMMA systems was carried out with copolymerized,1 grafted,2 and interpenetrating polymer networks3 in our earlier studies.…”