Abstract
The radical copolymerization of 2-hydroxyethyl methacrylate (HEMA, M1) and lauryl methacrylate (LMA, M2) was investigated at 60°C with AIBN in various solvents including benzene, tetrahydrofuran, tert-butylalcohol, and dimethylformamide. HEMA was found to have an abnormally high, apparent monomer reactivity ratio in benzene, r1=11.2, corresponding to its high aggregation tendency in this solvent as a result of hydrogen-bonding. The apparent reactivity ratios are more or less close to azeotropic unity in the other solvents. The solution behavior of monomers is proposed as a factor in the copolymerization between hydrophilic and hydrophobic monomers.
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The peak areas (A) around δ4.2—3.5 come from the HEMA oxyethylene and LMA ester α-methylene protons, while those (B) around δ2.3—0.7 from the other protons including the hydroxyl proton of HEMA when measured in CDCl3, (In CD3OD-CDCl3. the HEMA hydroxyl proton merged with the peak of the solvent at δ4.3.) The mole fraction of HEMA, x, was obtained from the ratio A/B as follows:
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Ito, K., Uchida, K., Kitano, T. et al. Solvent Effects in Radical Copolymerization between Hydrophilic and Hydrophobic Monomers; 2-Hydroxyethyl Methacrylate and Lauryl Methacrylate. Polym J 17, 761–766 (1985). https://doi.org/10.1295/polymj.17.761
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DOI: https://doi.org/10.1295/polymj.17.761
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