Degradation of Polymers of Methacrylic Acid Salts and Copolymers of these Salts with Methyl Methacrylate
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The degradation behaviour of poly (methacrylie acid) and its ammonium, alkali metal, alkaline earth metal and zinc salts is discussed. As in the case of polymers of many of the methacrylate esters, depolymerisation to monomer is an important reaction for the metal salt polymers, but there is an alternative route to the metal carbonate and cyclic and acyclic ketones, as well as several secondary reactions. Important factors are the volatility of the monomer (and isobutyrate, which is also formed) and the thermal stability of the metal carbonate. A reaction scheme is proposed for the metal salts. Ammonium polymethacrylate is unique amongst these salt polymers in degrading to give ammonia, water and cyclic structures in the polymer backbone which degrade at higher temperatures to give chain fragments plus isocyanic acid, carbon monoxide and methane.
A brief summary is given of the degradation behaviour of poly (methyl methacrylate) and copolymers of MM A with various covalently bonded monomers. Against this background, the behaviour of copolymers of MMA with Li, Na and K methacrylate is then considered in detail and the general features of the behaviour of MMA-zinc methacrylate copolymers are noted.
KeywordsAlkali Metal Methyl Methacrylate Methacrylic Acid Volatile Product Degradation Behaviour
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