Abstract
Isotactic (it-) and syndiotactic (st-) uniform poly(methyl methacrylate)s (PMMAs) with hydroxyl group at the chain end (PMMA-OH’s) were prepared by fractionating the corresponding non-uniform PMMAs by means of supercritical fluid chromatography (SFC). The uniform PMMA-OH’s with degrees of polymerization (DPS) of 16, 26 and 33 were each allowed to react with a trifunctional coupling agent, 1,3,5-benzenetricarbonyl trichloride, to obtain three-arm star polymers with uniform PMMA arms. Intrinsic viscosities of a series of the star PMMAs were measured in tetrahydrofuran at 40°C by using a differential viscometric detector connected with a size exclusion chromatograph. Tacticity dependence was observed not only in the viscosity but also in shrinking factor gη. A three-arm star PMMA with one arm with DP=16 and two arms with DP=31 (irregular star PMMA) was also prepared in a similar manner with the aid of SFC fractionation. The viscosity of the irregular star PMMA was found larger than that of the regular star PMMA with the same total number of monomer units.
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K. Hatada, K. Ute, K. Tanaka, Y. Okamoto, and T. Kitayama, Polym. J., 18, 1037 (1986).
T. Kitayama, T. Shinozaki, T. Sakamoto, M. Yamamoto, and K. Hatada, Makromol. Chem., Suppl., 15, 167 (1989).
T. Kitayama, Y. Zhang, and K. Hatada, Polym. J., 26, 868 (1994).
T. Hirano, H. Yamaguchi, T. Kitayama, and K. Hatada, Polym. J., 30, 767 (1998).
T. Kitayama, S. He, Y. Hironaka, and K. Hatada, Polym. J., 27, 314 (1995).
T. Kitayama and K. Hatada, “New Macromolecular Architecture and Functions (Proceedings of OUMS’95)”, M. Kamachi and A. Nakamura Eds., Springer-Verlag, 1995, p. 31.
P. O. Danis and D. E. Karr, Org. Mass Spectrom., 28, 923 (1993).
E. Klesper and W. Hartmann, Eur. Polym. J., 14, 77 (1977).
K. Ute, N. Miyatake, Y. Osugi, and K. Hatada, Polym. J., 25, 1153 (1993).
K. Ute and K. Hatada, “Fractionation by Packed-Column SFC and SFE”, M. Saito, Y. Yamauchi, and T. Okuyama Eds, VCH, 1994, p. 231.
K. Hatada, K. Ute, T. Kitayama, T. Nishiura, and N. Miyatake, Macromol. Symp, 85, 325 (1994).
K. Hatada, K. Ute, and N. Miyatake, Prog. Polym. Sci., 19, 1067 (1994).
K. Hatada and T. Kitayama, “Polymeric Materials Encyclopedia”, J. C. Salamone Ed., CRC Press, 1996, p. 8461.
K. Ute, N. Miyatake, and K. Hatada, Polymer, 36, 1415 (1995).
T. Kitayama, O. Nakagawa, S. Kishiro, T. Nishiura, and K. Hatada, Polym. J., 25, 707 (1993).
T. Kitayama, O. Nakagawa, and K. Hatada, Polym. J., 27, 1180 (1995).
K. Hatada, T. Nishiura, T. Kitayama, K. Ute, and S. Hirotani, Polym. J., 28, 185 (1996).
T. Nishiura, T. Kitayama, and K. Hatada, Polym. J., 28, 1021 (1996).
K. Hatada, T. Nishiura, T. Kitayama, and S. Hirotani, Macromol. Rapid Commun., 18, 37 (1997).
K. Hatada, T. Nishiura, T. Kitayama, and M. Tsubota, Polym. Bull., 36, 399 (1996).
J. M. Cowie, “Solution of Stereoregular Polymers” in “Light Scattering from Polymer Solutions”, M. B. Huglin Ed., Academic Press, London, 1972, p. 605.
B. H. Zimm and R. W. Kilb, J. Polym. Sci., 37, 19 (1959).
M. Kamijo, F. Abe, Y. Einaga, and H. Yamakawa, Macromolecules, 28, 1095 (1995).
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Kitayama, T., Nishiura, T., Tsubota, M. et al. Uniform Regular and Irregular Three-Arm Star Poly(methyl methacrylate)s. Polym J 31, 1001–1004 (1999). https://doi.org/10.1295/polymj.31.1001
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DOI: https://doi.org/10.1295/polymj.31.1001