Abstract
In order to find some of the fundamental characteristics of 1,2-polybutadiene, a series of samples with different degrees of crystallinity χ (below 46%) were prepared. Infrared and 13C-NMR spectra indicated that the weight fraction of the 1,2 unit with a syndiotactic configuration is mainly responsible for χ. X-Ray diffraction analysis, differential scanning calorimetry (DSC) analysis and dynamic measurement of viscoelasticity showed the following: (1) The structure of the unit cell of the crystal is identical with that assigned by G. Natta to syndiotactic 1,2-polybutadiene (orthorhombic). (2) The fusion of the crystal occurs over a wide range of temperature and χ decreases almost linearly with increasing temperature. (3) Certain characteristic temperatures of the fusion behavior of the crystal increases linearly with χ. (4) The specific heat of fusion is proportional of χ and an extrapolation gives 14.5 cal/g for 100% crystallinity. This value is fairly small when compared to those for polyethylene (66 cal/g) and poly-proplylene (33 cal/g), and nearly the same as those for polydecamethylene sebacate (13.8 cal/g) and polydecamethylene adipate (13.4 cal/g). (5) The temperature dependence of the storage modulus, E′, may be estimated fairly well with a simple assumption that “E′ depends on χ alone”. The mechanical and thermal properties of this polymer indicate that they behave as random copolymers with crystallizable (1,2 unit with syndiotactic conformation) and noncrystallizable components. Polymers with high χ are composed of molecules with long crystallizable sequences.
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Y. Takeuchi, M. Ichikawa, and K. Mori, Paper presented at 5th Polymer Symposium, Osaka, Japan, 1965.
D. Morero, A. Santambrogio, L. Porri, and F. Ciampelli, Chem. Ind., 41, 758 (1959).
V. D. Mochel, J. Polym. Sci., Part A-1, 10, 1009 (1972).
Y. Tanaka and Y. Takeuchi, J. Polym. Sci., Part A-2, 9, 43 (1971).
G. Natta and P. Corradini, J. Polym. Sci., 20, 251 (1956).
Polymer Handbook, J. Brandrup, E. H. Imergut, John Wiley & Sons, Inc., New York, N.Y., 1966.
A. Peterlin and G. Meinel, J. Appl. Phys., 36, 3028 (1965).
K. Kamide and K. Nakamura, Sen-i Gakkaishi (J. Soc. Fiber Sci. Technol.), 24, 486 (1968).
R. D. Evans, H. R. Mighton, and P. J. Flory, J. Am. Chem. Soc., 72, 2018 (1951).
P. J. Flory, Trans. Faraday Soc., 51, 848 (1955).
K. Ninomiya and J. D. Ferry, J. Polym. Sci., 5, 195 (1967).
M. Niinomi, T. Katsuta, and Y. Obata, Rep. Prog. Polym. Phys. Jpn., 17, 243 (1974).
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Obata, Y., Tosaki, C. & Ikeyama, M. Bulk Properties of Syndiotactic 1,2-Polybutadiene. I. Thermal and Viscoelastic Properties. Polym J 7, 207–216 (1975). https://doi.org/10.1295/polymj.7.207
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DOI: https://doi.org/10.1295/polymj.7.207
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