Thermogravimetric analysis of thermal stability of poly(methyl methacrylate) films modified with photoinitiators

Abstract

Films of poly (methyl methacrylate) (PMMA) were prepared by the addition of photoinitiator to the polymer. The influence of five organic photoinitiators on thermal stability of poly(methyl methacrylate) was studied by thermogravimetric analysis. Next, the PMMA films doped with these photoinitiators were UV irradiated and investigated in terms of changes in their thermal stability. It was found that the photoinitiators had accelerated thermal degradation of non-irradiated PMMA films due to the action of free radicals coming from the additives' thermolysis. For UV-irradiated specimens, the effect of photoinitiator on PMMA thermal stability depended on the chemical structure of organic compound modifying the polymer. In general, thermal stability of irradiated samples was higher in the presence of additives. Thermal destruction of modified PMMA can be explained by the formation of resonance structures in aromatic photoinitiators and consumption of energy in dissipation processes.

Hydrolytic degradation of poly(l‐lactic acid)/poly(methyl methacrylate) blends

“…Therefore, PLAs were blended with various biodegradable and non‐biodegradable polymers such as poly( ϵ ‐caprolactone), poly(ethylene oxide‐ b ‐amide‐12), poly(butylene succinate), poly(butylene adipate‐ co ‐terephthalate), poly(ether‐urethane), poly(ethylene terephthalate), poly(3‐hydroxybutyrate‐ co ‐4‐hydroxybutyrate), poly(vinyl acetate), poly(glycolic acid), hyperbranched polymers and rubbers . Amongst all, poly(methyl methacrylate) (PMMA) has been claimed as a promising partner for PLA due to its good physical and chemical properties such as high glass transition temperature, high transparency and long‐term stability …”

Gradient crystallinity and its influence on the poly(vinylidene fluoride)/poly(methyl methacrylate) membrane‐derived by immersion precipitation method

“…(5) is used to calculate the interlayer spacing of the crystalline polymer; nearly same d-spacing observed for all the membrane samples indicates there was no considerable crystalline phase change due to the presence of PMMA. 58 Thermal Analysis TGA thermogram of the prepared blends was analyzed and shown in Figure 8. PVDF exhibits single-step degradation, starts at 400 C and completes at 480 C. Addition of PMMA to the PVDF matrix led to a slight reduction in the degradation temperature and PVDF/PMMA blend shows two-step degradation.…”

“…The degradation of PMMA begins with the head-to-head chain breakage followed by methoxycarbonyl degradation at the higher temperature (350-400 C). 58 With an increase in amorphous polymer concentration, the blend degradation drops more toward the decomposition temperature of PMMA. The similar trend observed in the case of nanocomposite membrane as melting points of 70-30 blend membrane slightly dropped after the incorporation of fillers.…”

Synthesis and characterization of hydrogen bonded liquid crystalline block copolymers based on a Schiff base moiety

“…The TGA and DTG curves of HCP2 showed a broad peak between 212 and 545°C. There are three stages of decomposition with maxima at 307, 419, and 495°C on the DTG curve, and a corresponding mass loss of 58 % on the TGA curve, are due to the decomposition of the H-bond acceptor molecules and the donor backbone [23,24]. HCP7 showed a broad peak between 252 and 618°C.…”