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Changes in the Thermal Properties of PTT/PET Melt Blends with Melting Time  

Kim Young Ho (Department of Textile Engineering, Soongsil University)
Pang Kyeong (Department of Textile Engineering, Soongsil University)
Publication Information
Textile Science and Engineering / v.41, no.6, 2004 , pp. 451-457 More about this Journal
Abstract
Melt blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET) of various ratios were prepared by mixing at $280^{\circ}C$ for different times using twin screw type internal mixer, and their thermal properties were investigated by DSC, DMA and NMR spectroscopy. With increase in mixing time at $280^{\circ}C$, the two melting peaks of PTT/PET blends, corresponding to the melting of PTT and PET, merged to one peak and moved to lower temperatures, while the crystallization temperature moved to higher temperatures. DMA analysis indicated a single glass transition temperature for the PTT/PET melt blends of various compositions prepared by mixing at $280^{\circ}C$ for 5 minutes, indicating that the blends are completely miscible in the amorphous region. The transesterification reaction in the PTT/PET melt blends was confirmed bi NMR spectroscopic analysis. Degree of randomness and sequence length of the blends were calculated by using $^13C-NMR$ data. The former increased while the latter decreased as the melt mixing time increased.
Keywords
poly(trimethylene terephthalate); poly(ethylene terephthalate); melt blend; transesterification; degree of random­ness; sequence length;
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  • Reference
1 D. W. Ihm, S. Y. Park, C. G. Chang, Y. S. Kim, and H. K. Lee, 'Miscibility of Poly(ethylene terephthalate)/Poly(ethylene 2,6-naphthalate) Blends by Transesterification', J. Polym. Sci., Polym. Chem., 34, 2841-2850(1996)   DOI   ScienceOn
2 B. Jacques, J. Devaux, R. Legras, and E. Nield, 'Reactions Induced by Triphenyl Phosphite Addition During Melt Mixing of Poly(ethylene terephthalate)/Poly(butylene terephthalate) Blends: Influence on Polyester Molecular Structure and Thermal Behaviour', Polymer, 37, 1189-1200(1996)   DOI   ScienceOn
3 S. C. E. Backson, A. M. Kenwright, and R. W. Richards, 'A ^1^3C N.M.R. Study of Transesterification in Mixtures of Poly(ethylene terephthalate) and Poly(butylene terephthalate)', Polymer, 36, 1991-1998(1995)   DOI   ScienceOn
4 R. Yamadera and M. Murano, 'The Determination of Randomness in Copolyesters by High Resolution Nuclear Magnetic Resonance', J. Polym. Sci., Polym. Chem., 5, 2259-2268(1967)   DOI
5 Y. H. Kim and K. Pang, 'Miscibility and Thermal Properties of PTT/PET Blends', J. Korean Fiber Soc., 41, 16-21(2004)
6 S. C. Lee, K. H. Yoon, I. H. Park, H. C. Kim, and T. W. Son, 'Phase Behaviour and Transesterification in Poly(ethylene 2,6-naphthalate) and Poly(ethylene terephthalate) Blends', Polymer, 38, 4831-4835(1997)   DOI   ScienceOn
7 M. Guo and W. J. Brittain, 'Structure and Properties of Naphthalene-Containing Polyesters. 4. New Insight into the Relationship of Transesterification and Miscibility', Macromolecules, 31, 7166-7171(1998)   DOI   ScienceOn
8 R. A. Newmark, 'Sequence Distribution in Polyethylene/Tetramethylene Terephthalate Copolyesters by ^1^3C-NMR', J. Polym. Sci.: Polym. Chem., 18, 559-563(1980)