Microemulsion and Conventional Emulsion Co-polymerizations of p-Methyl Styrene with Methyl Methacrylate
Authors: Reddy, Ramana G.V.1; Thomas, Juby2; Radhakrishnan, P.K.3
Source: Designed Monomers & Polymers, Volume 11, Number 2, 2008 , pp. 159-171(13)
Publisher: VSP, an imprint of Brill
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Abstract:
Microemulsion (ME) and conventional emulsion (CE) co-polymerization of p-methyl styrene (pMSTY) with methyl methacrylate (MMA) are carried out at 70°C using n-pentanol (PA) and n-hexanol (HA), respectively, as co-surfactants along with sodium lauryl sulphate (SLS) as surfactant in the reaction media, and potassium persulphate (KPS) as initiator. The co-polymers are characterized by NMR and GPC techniques. The reactivity ratios are evaluated by employing Fineman-Ross (F-R), Kelen-Tüdös (K-T) and Mayo-Lewis integration (M-L-I) methods. The K-T method yields the reactivity ratios 0.68 ± 0.02 (rpMSTY), 0.40 ± 0.02 (rMMA), 0.68 ± 0.02 (rpMSTY) and 0.68 ± 0.02 (rMMA), respectively, for the ME and CE co-polymerizations of pMSTY and MMA with PA as co-surfactant in the reaction media. The K-T method yields the reactivity ratios 1.09 ± 0.02 (rpMSTY), 0.37 ± 0.02 (rMMA) and 0.78 ± 0.02 (rpMSTY) and 0.54 ± 0.02 (rMMA), respectively, for the ME and CE co-polymerization of pMSTY and MMA with HA as co-surfactant in the reaction media.Keywords: MICROEMULSION; CONVENTIONAL EMULSION; CO-POLYMERIZATION; REACTIVITY RATIOS; NMR; POLYMER MOLECULAR WEIGHT
Document Type: Regular paper
DOI: 10.1163/156855508X298062
Affiliations: 1: Polymer Division, Central Leather Research Institute, Adyar, Chennai-600 020, India;, Email: gvrr2004@yahoo.com 2: Department of Chemistry, School of Chemical Sciences, M.G. University, Kottayam, Kerala-686560, India 3: Polymer Division, Central Leather Research Institute, Adyar, Chennai-600 020, India
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