Copolyesters were prepared by melt condensation of poly(ethylene terephthalate) (PET) with poly(hexamethylene terephthalate), poly(octamethylene terephthalate), and poly(decamethylene terephthalate). These polymers were characterized by 13C- NMR and intrinsic viscosity measurements. The PET and the copolyesters were spun into fibers using the conventional melt spinning technique. The fibers were drawn to ratios of 3, 4, and 5. Decreases in Tg, Tc, Tm, density, birefringence, crystallinity, and orientation were observed in the copolyester fibers, with an increase in the number of methylene groups in the PET backbone.
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References
1.
Alexander, L.F., "X-ray Diffraction Method in Polymer Science," Wiley Interscience, London (1969 ).
2.
Boussias, C.M. , Peters, R.H., and Still, R.H., Copolyesters Studies, VI: Melt Spinning and Mechanical Properties of Tetramethylene Terephthalate-Poly(tetramethylene Oxide) Random Block Copolymers, J. Appl. Polym. Sci.25, 869 (1980).
3.
Dumbleton, J.H. , Influence of Crystallinity and Orientation on Sonic Velocity and Birefringence in Poly(ethylene Terephthalate) Fibers, J. Poljnn. Sci.A-26, 795 (1968).
4.
Farrow, G., and Preston, D., Measurement of Crystallinity in Drawn Polyethylene Terephthalate Fibres by X-ray Diffraction, Br. J. Appl. Phys.11, 353 (1960).
5.
Kumar, K.V.A.R. , Varma, D.S., and Veena, S., Structure Property Relationship in Copolyesters , Man-Made Textiles India12, 173 (1979).
6.
Marrs, W., Peters, R.H., and Still, R.H., Copolyester Studies III - Melt Spinning, Drawing and Mechanical Properties of Tetramethylene Terephthalate-Tetramethylene Sebacate Copolymer Fibres, J. Appl. Polym. Sci.23, 1095 (1979).
7.
Mishra, S., Veena, S., Varma, I.K., and Varma, D.S., Polyester Fibres with Improved Dye Uptake, Angew. Makromol. Chem.82, 63 (1979).
8.
Negi, Y.S., Choudhary, V., Varma, I.K., and Varma, D.S., Structure-Property Relationship in Copolyesters, Part I: Preparation and Characterisation of Ethylene Terephthalate and Hexamethylene Terephthalate Copolymers, J. Appl. Polym. Sci.28, 2291 (1983).
9.
Varma, D.S., Agarwal, Radha, and Varma, I.K., Synthesis andCharacterisation of Copolyesters from Poly(ethylene Terephthalate) and Poly(hexamethylene Terephthalate), Br. Polym. J.17 (1), 83 (1985).
10.
Varma, D.S. , Agarwal, Radha, and Varma, I.K., Synthesis andCharacterisation of Copolyesters from Poly(ethylene Terephthalate) and Poly(octamethylene Terephthalate), Polym. Commun.26, 346 (1985).
