Copolymerisation of 2-hydroxyethyl methacrylate with siloxanyl monomers |
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Authors: | MA Al-Issa TP Davis MB Huglin IB Yahya DCF Yip |
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Institution: | Department of Chemistry and Applied Chemistry, University of Salford, Salford M5 4WT, England |
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Abstract: | Acryloxymethylpentamethyldisiloxane (AMS) and methacryloxymethylpentamethyldisiloxane (MMS) have been prepared and purified chromatographically. Some physicochemical properties have been measured for these monomers as well as for highly purified 2-hydroxyethyl methacrylate (HEMA). Hydroxyl group analysis on copolymers of AMS with HEMA and of MMS with HEMA, obtained by free radical copolymerisation to low conversion, enabled monomer reactivity ratios to be determined by several procedures. The average values were rHEMA = 0.86, rAMS = 0.55 and rHEMA = 0.97, rMMS = 0.33. These values have been invoked in computing integral curves for the instantaneous copolymer composition throughout the whole range of conversion. |
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