Translucent nanolatexes through emulsion polymerisation of ethyl acrylate |
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Authors: | Sumit BhawalNaveen Kumar Pokhriyal Surekha Devi |
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Institution: | Department of Chemistry, Faculty of Science, M.S. University of Baroda, Baroda 390 002, Gujarat, India |
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Abstract: | Turbid emulsion systems of ethylacrylate/sodium dodecyl sulphate/water with monomer to surfactant (M/S) ratios 10 and 40 were transformed into stable transparent/translucent nanolatexes through emulsion polymerisation using potassium persulphate as an initiator. The latex particle size was observed to be similar to that obtained by true microemulsion polymerisation where M/S ratio is one. The kinetic plots exhibited two intervals upto M/S ratios 10. AIBN initiated systems showed separation of two phases for the M/S ratio ?10. M/S ratios were varied from 1 to 54 for the comparative study of polymerisation in emulsion and microemulsion media. Gel effect dominance was observed around 40-60% conversion for the microemulsion polymerisation of ethylacrylate. Only one chain per particle was observed for microemulsion system with M/S ratio 1 and three to four chains per particle were observed for the systems with M/S ratios 10 and 40. Unlike M/S=1 system, higher dependency of polymerisation rate on initiator concentration was observed for the systems with M/S=10 and 40. A possible mechanism for such a transformation has been proposed. |
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Keywords: | Polymerisation Emulsion Microemulsion Kinetics Ethyl acrylate Nanolatexes |
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