Abstract
Sol-gel transition and the structure of isotactic polypropylene (itPP) gels formed from toluene and o-xylene solutions were studied. Weight-average molecular weight range of samples used is from 25.8×104 to 50.1×104. A thermo-reversible gel was formed from a semi-dilute solution on cooling. Gel-melting temperature Tmg was measured and its dependency on polymer concentration as well as molecular weight was investigated. Tmg increased gradually with increasing polymer concentration and obeyed Eldridge-Ferry’s type of plot: the reciprocal absolute gel-melting temperature 1/Tmg had a linear relationship to the logarithm of volume fraction of polymer, while molecular weight dependency of Tmg was little. In a gel, many spherulites were observed, the spherulites were bound with crystalline ties, and a three-dimensional network structure was observed. In this crystalline network, a polymer solution was confined. It is concluded that the formation of spherulites and crystalline ties is conducive to gelation.
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A. Takahashi, T. Nakamura, and I. Kagawa, Polym. J., 3, 207 (1972).
B. Wunderlich and P. Sullivan, J. Polym. Sci., 61, 195 (1962).
D. C. Bassett, A. Keller, and S. Mitsuhashi, J. Polym. Sci., A, 1, 763 (1963).
A. J. Pennings, J. M. A. A. van der Mark, and H. C. Booij, Kolloid Z.-Z. Polym., 236, 99 (1970).
A. Takahashi, Polym. J., 4, 379 (1973).
A. Takahashi and S. Hiramitsu, Polym. J., 6, 103 (1974).
P. J. Lemstra and G. Challa, J. Polym. Sci., Polym. Phys. Ed., 13, 1809 (1975).
M. Girolamo, A. Keller, K. Miyasaka, and N. Overbergh, J. Polym. Sci., Polym. Phys. Ed., 14, 39 (1976).
A. J. Pennings, J. Polym. Sci., Polym. Symp., 59, 55 (1977).
E. D. T. Atkins, D. H. Isaac, A. Keller, and K. Miyasaka, J. Polym. Sci., Polym. Phys. Ed., 15, 211 (1977).
R. Benson, J. Maxfield, D. E. Axelson, and L. Mandelkern, J. Polym. Sci., Polym. Phys. Ed., 16, 1583 (1978).
A. Keller, Polymer, 20, 1371 (1979).
A. Takahashi, T. Kawaharada, and T. Kato, Polym. J., 11, 671 (1979).
P. J. Barham, M. J. Hill, and A. Keller, Colloid Polym. Sci., 258, 899 (1980).
P. Smith, P. J. Lemstra, and H. C. Booij, J. Polym. Sci., Polym. Phys. Ed., 19, 877 (1981).
C. O. Edwards and L. Mandelkern, J. Polym. Sci., Polym. Lett. Ed., 20, 355 (1982).
T. Tanigami, K. En, K. Yamaura, and S. Matsuzawa, Polym. J., 18, 31 (1986).
T. Tanigami, K. Yamaura, S. Matsuzawa, and K. Miyasaka, Polym. J., 18, 35 (1986).
R. C. Domszy, R. Alamo, C. O. Edwards, and L. Mandelkern, Macromolecules, 19, 310 (1986).
P. Smith and P. J. Lemstra, J. Mater. Sci., 15, 505 (1980).
P. Smith, P. J. Lemstra, J. P. L. Pijpers, and A. M. Kiel, Colloid Polym. Sci., 259, 1070 (1981).
C. G. Cannon, Polymer, 23, 1123 (1982).
A. Peguy and R. St. J. Manley, Polym. Commun., 25, 39 (1984).
M. Matsuo, C. Sawatari, M. Iida, and M. Yoneda, Polym. J., 17, 1197 (1985).
S. Mitsuhashi and M. Iguchi, Kobunshi, 34, 94 (1985).
A. Takahashi, M. Sakai, and T. Kato, Polym. J., 12, 335 (1980).
M. Okabe and H. Matsuda, Kobunshi Ronbunshu, 42, 397 (1985).
H. Matsuda, M. Imaizumi, H. Fujimatsu, S. Kuroiwa, and M. Okabe, Polym. J., 16, 151 (1984).
M. Okabe, M. Isayama, and H. Matsuda, Polym. J., 17, 369 (1985).
M. Okabe, M. Isayama, and H. Matsuda, J. Appl. Polym. Sci., 30, 4735 (1985).
J. E. Eldridge and J. D. Ferry, J. Phys. Chem., 58, 992 (1954).
H. D. Keith, F. J. Padden, Jr., and R. G. Vadimsky, J. Polym. Sci., A-2, 4, 267 (1966).
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Matsuda, H., Inoue, T., Okabe, M. et al. Study of Polyolefin Gel in Organic Solvents I. Structure of Isotactic Polypropylene Gel in Organic Solvents. Polym J 19, 323–329 (1987). https://doi.org/10.1295/polymj.19.323
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DOI: https://doi.org/10.1295/polymj.19.323
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