Abstract
The crystallization and melting behavior of binary mixtures of nylon 6 and nylon 66 was investigated by differential scanning calorimetry (DSC). Mixture samples prepared from solution were carefully arranged so as to attain a well-mixed state prior to the measurement of DSC. In the mixtures nylon 6 and nylon 66 crystallize separately; nylon 66 crystallizes preferably, while the crystallization of nylon 6 was restricted remarkably, especially in the region where the content of nylon 6 was small. In melting temperature diagram, considerable reduction of melting temperature of nylon 66 was observed, probably due to the diluent effect caused by nylon 6. Analysis of this reduction in terms of the Nishi–Wang equation made it possible to estimate the polymer–polymer interaction parameter for the present mixture system. Obtained parameter is a relatively large negative value and the contribution from the entropy term is significant. Melting temperature of nylon 6 in the mixtures was observed in the narrow range of composition where the content of nylon 66 is small. In the crystallization temperature diagram, the crystallization temperature read from the peak position of the crystallization profile starts from nylon 66, decreased in the mixtures and leveled off. Total crystallinity including both nylon components evaluated from the area under the profile decreased appreciably in the intermediate region of composition. The slope of increasing curve of each profile on cooling process was evaluated as a relative measure for the rate of crystal growth. The composition dependence of the slope thus obtained is discussed qualitatively from the viewpoint of crystallization kinetics concerning crystal growth of both nylon components in the mixtures.
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K. Matsumura, T. Shimomura, T. Matsuda, and M. Hirami, to be submitted to Polym. J.
T. Shimomura, T. Matsuda, and M. Hirami, to be submitted to Polym. J.
P. J. Flory, “Principles of Polymer Chemistry,” Cornell University, Ithaca, N.Y., 1953, Chapter XIII-2.
L. Mandelkern, “Crystallization of Polymers,” McGraw-Hill, New York, N.Y., 1963, Chapter 3.
T. Nishi and T. T. Wang, Macromolecules, 8, 909 (1975).
L. Mandelkern, in “Comprehensive Polymer Science, Vol. 2, Polymer Properties,” C. Booth and C. Price, Ed., Pergamon Press, New York, N.Y., 1989, Chapter 11.
R. S. Stein, in “Crystallization of Polymers,” M. Dosiere, Ed., Kluwer Academic Publishers, Dordrecht, The Netherlands, 1993, pp 421–435.
L. Mandelkern, R. G. Alamo, G. D. Wignall, and F. C. Stehling, TRIP, 4, 377 (1996).
H. Mitomo and H. Tonami, Chem. High Polym., 27, 134 (1970).
E. S. Ong, Y. Kim, and H. L. Williamson, J. Appl. Polym. Sci., 31, 376 (1986).
F. Rybnikar and P. H. Geil, J. Appl. Polym. Sci., 46, 797 (1992).
F. Rybnikar and P. H. Geil, J. Appl. Polym. Sci., 49, 1175 (1993).
P. J. Flory, Disc. Faraday Soc., 49, 7 (1970).
Reference 4, Chapter 5-2, p 120.
M. Hirami and T. Matsuda, Polym. J., 31, 801 (1999).
Reference 4, Chapter 8-7, p 273.
T. T. Wang and T. Nishi, Macromolecules, 10, 421 (1977).
J. H. Magill, Polymer, 2, 221 (1961).
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Matsuda, T., Shimomura, T. & Hirami, M. Crystallization and Melting of Binary Mixtures of Nylon 6 and Nylon 66. A Study by DSC. Polym J 31, 795–800 (1999). https://doi.org/10.1295/polymj.31.795
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DOI: https://doi.org/10.1295/polymj.31.795
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