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Determination of Crystallinity in Graphite Fiber-Reinforced Thermoplastic Composites

Published online by Cambridge University Press:  06 March 2019

M. R. James  and
D.P. Anderson
M. R. James
Affiliation:
Rockwell International Science Center, Thousand Oaks, CA 91360
D.P. Anderson
Affiliation:
Rockwell International Science Center, Thousand Oaks, CA 91360
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Interest in advanced thermoplastic composites for use in high performance structures stems from their order of magnitude improvement in fracture toughness and delamination resistance over epoxy based composites, their strong solvent resistance, and the possibility of dramatically lower fabrication costs through processing flexibility. The chemical and mechanical properties of semicrystalline thermoplastics depend on the morphology of the material, such as the crystallinity content and spherulite size. We describe here the use of x-ray diffraction to characterize the degree of crystallinity of the polyetheretherketone-graphite composite system, a leading thermoplastic candidate for use in aerospace vehicles. In reflection, diffraction from the microcrystalline graphite fibers dominates the scattered signal and must be adequately accounted for. The technique is useful on large samples and for quality control. In transmission, the graphite signal is weak, thus simplifying data analysis; however, sample thickness must be limited.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 29: Thirty-Fourth Annual Conference on Applications of X-ray Analysis, August 5-9, 1985 , 1985 , pp. 291 - 303
Copyright
Copyright © International Centre for Diffraction Data 1985

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References

1. Schultz, J.M. Microstructural Aspects of Failure in Semicrystalline Polymers, Polymer Eng. and Sci., 24: 770 (1984).Google Scholar
2. Blundell, D.J. and Osborn, B.N., The Morphology of Poly(ary1-etherether- Ketone), Polymer, 24: 953 (1983).Google Scholar
3. Dawson, P.C. and Blundell, D.J., X-ray Data for Poly(aryl ether katones), Polymer, 21: 577 (1980).Google Scholar
4. Cogswell, F.N., Microstructure and Properties of Thermoplastic Aromatic Polymer Composites, in 12th National SAMPE Symposium, April 12-14, p. 528 (1983).Google Scholar
5. Wakelin, J.H., Virgin, H.S. and Crystal, E., Development and Comparisons of Two X-Ray Methods for Determining the Crystallinity of Cotton Cellulose, J. Appl. Phys., 30: 1654 (1959).Google Scholar
6. Sotton, M., Arniaud, A., and Rabourdin, C., Crystallinity and Disorder in PET Vibers, J. App. Polymer Sci., 22: 2585 (1978).Google Scholar
7. Radhakrishnan, S. and Nadkarni, V.M., Modification of Surface Structure and Crystallinity in Compression-Molded PPS. Polymer Eng. and Sci., 24: 1383 (1984).Google Scholar
8. Chung, F.H. and Scott, R.W., A new Approach to the Determination Of Crystallinity of Polymers by X-Ray Diffraction, J. Appl. Cryst., 6: 225 (1973).Google Scholar
9. Brady, D.G., The Crystallinity of PPS. nd its Effect on Polymer Properties, J. Appl. Polymer Sci., 20: 2541 (1976).Google Scholar
10. Kays, A.O. and Hunter, J.D., Characterization of Some Solvent- Resistent Thermoplastic Matrix Composites, in Composite Materials: Quality Assurance and Processing, ASTM. TP. 97, Browning, C.E., ed., American Society for Testing and Materials, p. 119 (1983).Google Scholar
11. Ruland, W., X-Ray Determination of Crystallinity and Diffuse Disorder Scattering, Acta. Cryst., 14: 1180 (1961).Google Scholar
12. Vonk, C.G., Computerization of Ruland's X-Ray Method for Determination of Crystallinity in Polymers, J. Appl. Cryst., 6: 148 (1973).Google Scholar
13. Fontaine, F., Ledent, J., Groeninckx, G., and Reynaera, H., Morphology and Melting Behavior of Semi-Crystalline PET: 3. Quantification of Crystal Perfection and Crystallinity, Polymer, 23: 185 (1982).Google Scholar
14. Balta Calleja, F.J., Salazar, J. Martinez, Cackovic, H. and Cackovic, J. Loboda, Correlation of Hardness and Microstructure in Unoriented Lamellar Polyethylene, J. Mater. Sci., 16: 739 (1981).Google Scholar
15. Ahtee, M., Hattula, T., Mangs, J. and Paakkari, T., An X-Ray Diffraction Method for Determination of Crystallinity in Wood Pulp, Paperi ja Puu - Papper och Tra, 8: 475 (1983).Google Scholar
16. Hlavara, D., Baldrian, J. and Plestil, J., Quantitative Characterization of the Structure Changes in Low Crystalline PET Fibers by X-Ray Diffraction, Acta Polymerica, 33: 256 (1982).Google Scholar
17. Mannan, Kh.M. and Lutfar, L.B., Effects of Grafted Methyl Methacrylate on the Microstructure of Jute Fibers, Polymer, 21: 777 (1980).Google Scholar
18. Anderson, D.P., X-Ray Analysis Software: Operation and Theory Involved in Program “DIFF”, AFWAL-TR-85-4079, June 1985, Materials Laboratory, Air Force Wright Aeronautical Laboratories.Google Scholar
19. Milberg, M.E., Transparency Factors for Weakly Absorbing Samples in X-Ray Diffraction, J. Appl. Phys., 29: 64 (1958).Google Scholar
20. International Tables for X-Ray Crystallography, Kynoch Press, Birmingham, England (1968).Google Scholar
21. Compton, A.H. and Allison, S.K., X-Rays in Theory and Experiment, D. Van Nostrand Co., Inc., New York, 1935, pp. 780–782.Google Scholar
22. Naidu, S.U.N. and Houska, C.R., Profile Separation in Complex Powder Patterns, J. Appl. Cryst., 5: 190 (1982).Google Scholar
23. Problem-Solving Software System for Mathematical and Statistical F0RTRAH Programming, IMSLR. Library Edition 9.2, IMSL. Inc. Houston, TX.Google Scholar
24. Kati, S.S. and Shultz, J.M., The Microstructure of Injection-Molded Semicrystalline Polymers: A Review, Polymer Eng. and Sci., 22: 1001 (1982).Google Scholar
25. Blundell, D.J., Chalmers, J.M., MacKenzie, M.W. and Gaskin, W.F., Crystalline Morphology of the PEEK.-Carbon Fiber Aromatic Polymers Composite I. Assessment of Crystallinity, SAMPEL Nuarterly, 16: 22 (1985).Google Scholar