Abstract
Anionic copolymerizations of (S)- or (RS)-α-methylbenzyl methacrylate (MBMA, M1) and methyl methacrylate (MMA, M2) were carried out by butyllithium in toluene and in tetrahydrofuran (THF) at −78°C. The monomer reactivity ratios were r1=0.78 and r2=1.68 in toluene and r1=1.52 and r2=2.04 in THF, where (S)- and (RS)-MBMAs showed the same reactivity in the same solvent. The isotacticity of poly[(RS)MBMA] obtained in toluene was lower than that of poly[(S)-MBMA], while the copolymer of (RS)-MBMA and MMA showed an isotacticity nearly equal to that of the corresponding copolymer of (S)-MBMA and MMA. The copolymers obtained in THF were syndiotactic. The values of σ12 and σ21, the probabilities of forming a meso dyad between M1 or M2 chain end and M2 or M1 monomer, were calculated assuming the terminal model statistics for the copolymerization in THF. The copolymers of (S)-MBMA and MMA showed negative optical rotations having absolute values slightly higher than those calculated from the rotation of poly[(S)-MBMA].
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Yuki, H., Ohta, K., Okamoto, Y. et al. Anionic Copolymerization of (S)- or (RS)-α-Methylbenzyl Methacrylate and Methyl Methacrylate. Polym J 10, 505–511 (1978). https://doi.org/10.1295/polymj.10.505
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DOI: https://doi.org/10.1295/polymj.10.505