Crystallinity and crystallite size of eight types of native Egyptian cotton have been measured by the multipeak-resolution method of Hindeleh and Johnson. Remarkable variations in crystallinity were found—it ranges between 69 and 53%—while the crystallite size normal to the 002 planes ranges between 4.1 and 3.6 nm.
A sample that possesses higher values of crystallinity and birefringence is characterized by higher values of breaking tenacity and stiffness and by a lower value of breaking elongation. The finest fiber (Guiza 45) has the best structural parameters and tensile properties.
Although the crystallinity and birefringence are highly correlated with the physical properties, the birefringence correlation is more significant.
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References
1.
Ant Wuorinen, O., Evaluation of the Crystallinity of Cellulose from X-Ray Diffraction Pictures, Papier ja Puu37, 335-368 (1955).
2.
Bennett, S.C. , Johnson, D.J., and Murray, R., Structural Characterization of a High-Modulus Carbon Fiber by High-Resolution Electron Microscopy and Electron Diffraction , Carbon14, 117-122 (1976).
3.
Caulfield, D.F. , Crystallite Sizes in Wet and Dry Valonia Ventricosa , Textile Res. J.41, 267-269 (1971).
4.
Clark, G.L. and Terford, H.C., Quantitative X-Ray Determination of Amorphous Phase in Wood Pulps as Related to Physical and Chemical Properties, Anal. Chem.27, 888-895 (1955).
5.
Conrad, C.C. and Scroggie, A.G., ChemicalCharacterization of Rayon Yarns and Cellulosic Raw Materials, Ind. Eng. Chem.37, 592-598 (1945).
6.
Dobb, M.G., Hindeleh, A.M., Johnson, D.J., and Saville, B.P., Lattice-Resolution in Electron-Beam Sensitive Polymer, Nature253, 189-190 (1975).
7.
Dobb, M.G., Johnson, D.J., and Saville, B.P., Direct Observation of Structure in High-Modulus Aromatic Fibers, J. Polym. Sci.: Polym. Symp.58, 237-251 (1977).
8.
Dobb, M.G., and Murray, R., Towards HigherResolution in Electron Beam Sensitive Specimens of Biological Origin, J. Microsc.101, 299-309 (1974).
9.
Frazer, R.D.B. and Suzuki, E., Resolution of Overlapping Absorption Bands by Least Squares Procedures, Anal. Chem.38, 1770-1773 (1966).
10.
Hermans, P.H. and Weidinger, A., X-Ray Studies on the Crystallinity of Cellulose , J. Polym. Sci.4, 135-144 (1949).
11.
Hermans, P.H. and Weidinger, A., Quantitative Investigation of X-Ray Diffraction by Amorphous Polymers and Some Other Moncrystalline Substances, J. Polym. Sci.5, 269-281 (1950).
12.
Hindeleh, A.M. , Optical Anisotropy in Cotton, J. Phys. D: Appl. Phys.11, 2335-2339 (1978 ).
13.
Hindeleh, A.M. , X-Ray Characterization of Viscose Rayon and the Significance of Crystallinity on Tensile Properties, Textile Res. J.50, 581-589 (1980).
14.
Hindeleh, A.M. and Johnson, D.J., TheResolution of Multipeak Data in Fiber Science, J. Pkys. D.: Appl. Phys.4, 259-263 (1971).
15.
Hindeleh, A.M. and Johnson, D.J., Correlation Crystallinity and Physical Properties of Heat-Treated Cellulose Triacetate Fibers, Polymer11, 666-680 (1970).
16.
Hindeleh, A.M. and Johnson, D.J., Peak Resolution andX-Ray Crystallinity Determination in Heat-Treated Cellulose Triacetate, Polymer13, 27-32 (1972).
17.
Hindeleh, A.M. and Johnson, D.J., Crystallinity andCrystallite Size Measurement in Cellulose Fibers: 1. Ramie and Fortisan, Polymer13, 423-4301972).
18.
Hindeleh, A.M. and Johnson, D.J., Crystallinity andCrystallite Size Measurementi n Cellulose Fibers: 2. Viscose Rayon, Polymer15, 697-705 (1974).
19.
Hindeleh, A.M. and Johnson, D.J., Crystallinity andCrystallite Size Measurement in Polyamide and Polyester Fibers, Polymer19, 27-32 (1978).
20.
Hindeleh, A.M. and Johnson, D.J., An Empirical Estimation of Scherrer Parameters for the Evaluation of True Crystallite Size in Fibrous Polymers, Polymer, in press (1980).
21.
Hosemann, B.K. and Bagchi, S.N., "Direct Analysis of Diffraction by Matter ," North Holland Publishing Co., Amsterdam, 1962, p. 656.
22.
Johnson, D.G. and Crawford, D., Defocusing Phase Contrast Effects in Electron Microscopy, J. Microsc.98, 313-324 (1972).
23.
Johnson, D.G. and Crawford, D., Observation of a Three-Phase Structure in High-Modulus PAN-Based Carbon Fibers, J. Material Sci.8, 286-290 (1973).
24.
Nieduszynski, I. and Preston, R.D., Crystallite Size in Natural Cellulose, Nature225, 273-274 (1970).
25.
Paralikar, K.M. and Betrabet, S.M., Electron Diffraction Technique for the Determination of Cellulose Crystallinity, J. Appl. Polym. Sci.21, 899-903 (1977).
26.
Powell, M.J.D. , An Efficient Method for Finding the Minimum of a Function of Several Variables Without Calculating Derivatives, Computer J.7, 155-162 (1964).
27.
Ray, P.K., TheEffect of Humidity on the Crystallinity of Cellulose, Textile Res. J.41, 944 (1971).
28.
Ruland, W., X-Ray Determination of Crystallinity and Diffuse DisorderActa Cryst.14, 1180-1185 (1961).
29.
Segal, L., Creely, J.J., Martin, A.E., and Conrad, C.M., An Empirical Method for Estimating the Degree of Crystallinity of Native Cellulose Using, the X-Ray Diffractometer, Textile Res. J.29, 786-794 (1959).
30.
Shenouda, S.G. and Viswanathan, A., Crystalline Character of Native and Chemically Treated Egyptian Cotton, I. Computation of Crystallinity Disorder Parameter, Orientation Factor, and Spiral Angle, J. Appl. Polym. Sci.15, 2259-2275 (1971).
31.
Stokes, A.R. , A Numerical Fourier-Analysis Method for the Correction of Widths and Shapes of Lines on X-Ray Powder Photographs, Proc. Phys. Soc.A61, 372-391 (1948).
32.
Viswanathan, A. and Ventakrishnan , V., Disorder in Cellulose Fibers, J. A ppl. Polym. Sci.13, 785-795 (1969).
33.
Wakelin, J.H. , Virgin, H.S., and Crystal, E., Development andComparison of Two X-Ray Methods for Determining the Crystallinity of Cotton Cellulose, J. Appl. Phys.11, 1654-1662 (1959).
