Polyester continuous filament yams were drawn at 36 and 200°C at four different draw ratios: 2.65, 3.0, 4.0, and 5.0. Crystallinity and molecular orientation were investigated using infrared spectroscopy, x-ray diffraction, birefringence, and sonic velocity. The densities were determined using the flotation technique, and sonic velocity was measured using a dynamic modulus tester PPM-5R. X-ray and infrared crystallinity indices of fibers changed because of the drawing, which could be further correlated with the data obtained by density measurement. Dyeing behavior was also investigated in terms of crystallinity changes caused by the thermomechanical process, and the changes in the molecular orientation because of drawing.
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References
1.
Bidermann, W. , Effect of Crystal Modification On Dyeing Behaviour of Disperse Dyes, J. Soc. Dyers Color.87, 105-111 (1971).
2.
Charch, W.H. , and Moseley, W.W., Structure-Property Relationships in Synthetic Fibers, Part I: Structure as Revealed by Sonic Observations, Textile Res. J.29, 525-535 (1959).
3.
Centola, G., Supermolecular Structure and Fibre Properties, J. Textile Inst.59, 445-456 (1968).
4.
Cobbs, W.H., and Burton, R.L., Crystallization of Poly(ethylene Terephthalate), J. Polym. Sci.10, 275-290 (1953).
5.
Daubeny, R. De.P., Bunn, C.W., and Brown, C.J., The Crystal Structure of Poly(ethylene terephthalate), Proc. Roy. Soc LondonA226, 531-542 (1954).
6.
Dumbleton, J.H. , Influence of Crystallinity and Orientation On Sonic Velocity and Birefringence in Poly(eihylene terephthalate) Fibres , J. Polym. Sci. Part A-2 6, 795 (1968).
7.
Farrow, G., and Preston, D., Measurement of Crystallinity in Drawn Poly(ethylene Terephthalate) Fibres by X-Ray Diffraction, Brit. J. Appl. Phys.11, 353-358 ( 1960).
8.
Hearle, J.W.S. , "Fibre Structure," ch. 6, J. W. S. Hearle and R. H. Peters, Eds., Butterworths, Manchester, 1963, p. 209.
9.
Hearle, J.W.S. , and Greer, R., Fiber Structure, Textile Prog.2, no. 4 (1970).
10.
Hearle, J.W.S. , The Structural Mechanics of Fibres, J. Polym. Sci. Part C 20, 215-251 (1967).
11.
Housman, J.A. , and Walter, N.M., "Physical Methods in Chemical Analysis , vol. I, Academic Press, New York, 1960.
12.
Jameel, H., Waldman, J., and Rebenfeld, L., TheEffect of Orientation and Crystallinity on Solvent-Induoed Crystallization of Poly(ethylene Terephthalate), Part I: Sorption- and Diffusion-Related Phenomena, J. Appl. Polym. Sci.26, 1795-181 (1981).
13.
Manjunath, B.R. , Venkataraman, A., and Thomas, Stephan, TheEffect of Moisture Present in Polymers on Their X-Ray Diffraction Patterns . J. Appl. Polym. Sci.17, 1091-1099 (1973 ).
14.
Meredith, R. , Structure And Properties of Fibers, Textile Prog.7, no. 4 (1975).
15.
Miyake, A., TheInfrared Spectrum of Poly(ethylene Terephthalate), Part I: Effect of Crystallization, J. Polym. Sci.38, 479 (1959).
16.
Morgan, H.M. , Correlation of Molecular Orientation Measurements in Fibers by Optical Birefringence and Pulse Velocity Methods, Textile Res. J.32, 866-868 ( 1962).
17.
Moseley, W.W. , TheMeasurement of Molecular Orientation in Fibres by Acoustic Methods , J. Appl. Polym. Sci.3, 266-276 (1960).
18.
Samuels, R.J. , "Science and Technology of Polymer Films," ch. 7, O. J. Sweeting, Ed., Interscience, New York, 1968.
19.
Samuels, R.J. , Morphology of Deformed Polypropylene, Qualitative Relations by Combined X-Rays, Optical, and Sonic Methods, J. Polym. Sci. A 3, 1741-1763 ( 1965).
20.
Statton, W. O., "Handbook of X-Rays in Research and
21.
Analysis," E. Kabale, Ed., McGrew Hill, New York, 1967.
22.
Stein, R.S. , and Norris, Forrest H., TheX-Ray Diffraction, Birefringence, and Infrared Dichroism of Stretched Polyethylene , J. Polym. Sci.21, 381-396 (1956).
23.
Stein, R.S. , TheX-Ray Diffraction, Birefringence and Infrared Dichroism of Stretched Polyethylene, Part II: Generalized Uniaxial Crystal Orientation, J. Polym. Sci.31, 327-334 ( 1958).
24.
Warwicker, J.O., TheStructural Causes of Variations in Dyeing Properties of Terylene Yam Subjected to Dry and Wet Heat, J. Soc. Dyers Colour. 88, 142-151 ( 1972).
