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Reactivity ratios in conventional and nickel-mediated radical copolymerization of methyl methacrylate and functionalized methacrylate monomers
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UNSPECIFIED (2005) Reactivity ratios in conventional and nickel-mediated radical copolymerization of methyl methacrylate and functionalized methacrylate monomers. EUROPEAN POLYMER JOURNAL, 41 (10). pp. 2255-2263. doi:10.1016/j.eurpolymj.2005.04.012 ISSN 0014-3057.
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Official URL: http://dx.doi.org/10.1016/j.eurpolymj.2005.04.012
Abstract
Copolymerization of an excess of methyl methacrylate (MMA) relative to 2-hydroxyethyl methacrylate (HEMA) was carried out in toluene at 80 degrees C according to both conventional and controlled Ni-mediated radical polymerizations. Reactivity ratios were derived from the copolymerization kinetics using the Jaacks method for MMA and integrated conversion equation for HEMA (r(MMA) = 0.62 +/- 0.04; r(HEMA) = 2.03 +/- 0.74). Poly(ethylene glycol) alpha-methyl ether, omega-methacrylate (PEGMA, M-n = 475 g mol(-1)) was substituted for HEMA in the copolymerization experiments and reactivity ratios were also determined (rMMA = 0.75 +/- 0.07; r(PEGMA) similar to 1.33). Both the functionalized comonomers were consumed more rapidly than MMA indicating the preferred formation of heterogeneous bottle-brush copolymer structures with bristles constituted by the hydrophilic (macro)monomers. Reactivity ratios for nickel-mediated living radical polymerization were comparable with those obtained by conventional free radical copolymerization. Interactions between functional monomers and the catalyst (NiBr2(PPh3)(2)) were observed by H-1 NMR spectroscopy. (c) 2005 Elsevier Ltd. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | EUROPEAN POLYMER JOURNAL | ||||
Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | ||||
ISSN: | 0014-3057 | ||||
Official Date: | October 2005 | ||||
Dates: |
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Volume: | 41 | ||||
Number: | 10 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 2255-2263 | ||||
DOI: | 10.1016/j.eurpolymj.2005.04.012 | ||||
Publication Status: | Published |
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