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Computer Capability for the Determination of Polymer Crystallinity by X-Ray Diffraction

  • Andrew M. Wims (a1), Mark E. Myers (a1), Jack L. Johnson (a1) and Julia M. Carter (a1)

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The physical and mechanical properties of many industrially important polymers are profoundly influenced by their degree of crystallinity; such properties include flex modulus, tensile strength, percent elongation, and impact strength. Commonly used polymers influenced by their crystallinity level include polyethlene, polypropylene, polyesters, and nylons. Many of these materials are above their glass transition temperature at room temperature and would be useless were it not for their crystalline phase which typically has a melting point far above room temperature. The crystalline ‘ regions (domains) in these materials are frequently very small, typically in the nanometer range in diameter. These crystalline domains act as reinforcing fillers (in somewhat the same manner as carbon black In rubber) and give strength to the polymer.

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1. Billmeyer, F.W., Jr., Textbook of Polymer Science, Wiley-interacience, New York, 1971, p.235-7.
2. KakuJo, M. and Kasai, N., X-Ray Diffraction by Polymers, Elsevier Publishing Company, New York, 1972, p.359-366.
3. Kakudo, M. and Kasai, N., op. olt., p.111.
4. Miller, R.L., “Crystallinity”, in Encyclopedia of Polymer Science and Technology, vol 4., Mark, H.F., Gaylord, N.G., and Bikales, N.H. editors, Interscience Publishers, New York, 1966, p, 480-1.
5. Miller, R.L., op. cit., p.477-484.
6. Miller, R.L., op. cit., p.509-510.
7. Hindeleh, A.M. and Johnson, D.J., “Crystallinity and Crystallite Size Measurement in Polyamide and Polyester Fibres”, Polymer, 19, 27 (1973).
8. Farrow, G., “The Measurement of Crystallinity in Polypropylene Fibres by X-ray Diffraction”, polymer, 2, 409 (1961).
9. Farrow, G. and Preston, D., “Measurement of Crystallinity in Drawn Polyethylene Terephthalate Fibres by X-ray Diffraction”, British Journal of Applied Physics, 11, 353 (1960).

Computer Capability for the Determination of Polymer Crystallinity by X-Ray Diffraction

  • Andrew M. Wims (a1), Mark E. Myers (a1), Jack L. Johnson (a1) and Julia M. Carter (a1)

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