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Radical copolymerization of acrylic acid and OEGMA475: Monomer reactivity ratios and structural parameters of the copolymer

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Abstract

Alternative copolymers of acrylic acid (AA) and oligo(ethylene glycol) methyl ether methacryate (475 g/ mol (OEGMA475)) macromer, having various amounts of two monomers, were synthesized using aqueous solution free radical copolymerization at 50 ±C with ammonium persulfate (APS) as an initiator. The structures of the copolymers were confirmed by nuclear magnetic resonance (NMR) spectroscopy. In fact, samples with different molar ratios of two monomers in deionized water were prepared and subsequently copolymerization reaction was performed to low conversion levels (below 10%). Monomer reactivity ratios of OEGMA475, AA pair were estimated using the Finemann-Ross (FR), inverted Finemann-Ross (IFR), Kelen-Tüdös (KT), extended Kelen-Tüdös (EKT), Mayo-Lewis (ML) and Yezrelieve-Brokhina-Roskin (YBR) graphical methods. The value ranged from 0.908 to 0.963 for r OEGMA and from 0.208 to 0.243 for r AA depending on conversion percentage and calculation methods of monomer reactivity ratios. In all the cases, r OEGMA ×r AA <1 and r OEGMA >r AA indicate that the resulting copolymer has a tendency toward alternation with an azeotropic point in MOEGMA=0.905. Structural parameters of the copolymers were obtained by calculating the dyad monomer sequence fractions and the mean sequence length.

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Authors and Affiliations

  1. Iran Polymer and Petrochemical Institute, P.O.Box: 14965/115, Tehran, Iran

    Hossein Abdollahi, Farshid Ziaee & Kourosh Kabiri

  2. Department of Chemistry, University of Zanjan, P.O. Box: 45371-38791, Zanjan, Iran

    Vahid Najafi

  3. Faculty of Chemistry, University of Mazandaran, Babolsar, Iran

    Farhad Narimani

Authors
  1. Hossein Abdollahi
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  2. Vahid Najafi
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  3. Farshid Ziaee
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  4. Kourosh Kabiri
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  5. Farhad Narimani
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Correspondence to Vahid Najafi.

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Abdollahi, H., Najafi, V., Ziaee, F. et al. Radical copolymerization of acrylic acid and OEGMA475: Monomer reactivity ratios and structural parameters of the copolymer. Macromol. Res. 22, 1330–1336 (2014). https://doi.org/10.1007/s13233-014-2190-y

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  • DOI: https://doi.org/10.1007/s13233-014-2190-y

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