수용액 내에서 수용성개시제를 이용한 단분산성 폴리메타크릴산의 용액중합 = Preparation of Monodisperse Poly(Methacrylic acid) with a Water-Soluble Initiator by Solution Polymerization in the Aqueous Phase

다국어 초록 (Multilingual Abstract)

Solution polymerization was conducted with water-soluble methacrylic acid (MAA) as a monomer and potassium persulfate (KPS) as an initiator at a selected temperature between 70℃ and 90℃. When the ratio between MAA and water was reduced or initiator concentration increased, molecular weights decreased. Molecular weights of poly(methacrylic acid) (PMAA) showed nearly no dependence on reaction temperature. The Weissenberg effect was observed in most polymerization reactions, while its effect weakened at 90℃. The polydispersity index was less than 1.5 in most of the reactions. An increase in the stirring speed produced PMAAs with increasing molecular weights. When the stirring speed reached 800 rpm, we retrieved a monodisperse PMAA with both the number and weight average molecular weights of 791,000 g/mol. The glass transition temperature was found to be 162℃.