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Rapid crystallization and thermoreversible gelation of poly(ethylene terephthalate) in polymer/oligomer binary system

1998; Wiley; Volume: 36; Issue: 7 Linguagem: Inglês

10.1002/(sici)1099-0488(199805)36

1099-0488

Gi Xue, Gendin Ji, Yuching Li,

biodegradable polymer synthesis and properties

Journal of Polymer Science Part B: Polymer PhysicsVolume 36, Issue 7 p. 1219-1225 Article Rapid crystallization and thermoreversible gelation of poly(ethylene terephthalate) in polymer/oligomer binary system Gi Xue, Corresponding Author Gi Xue Department of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaDepartment of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaSearch for more papers by this authorGendin Ji, Gendin Ji Department of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaSearch for more papers by this authorYuching Li, Yuching Li Department of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaSearch for more papers by this author Gi Xue, Corresponding Author Gi Xue Department of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaDepartment of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaSearch for more papers by this authorGendin Ji, Gendin Ji Department of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaSearch for more papers by this authorYuching Li, Yuching Li Department of Polymer Science and Engineering, Chemistry Building, Nanjing University, Nanjing, 210093, P.R. ChinaSearch for more papers by this author First published: 07 December 1998 https://doi.org/10.1002/(SICI)1099-0488(199805)36:7 3.0.CO;2-BCitations: 7AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Poly(ethylene terephthalate) (PET) was rapidly crystallized through thermoreversible gelation in a liquid ethylene glycol oligomer or in epoxy resin. The solutions formed gel rapidly on cooling. Polarized light microscopy and small-angle light scattering showed that these gels contain large, regular PET spherulites. The gels may be formed by two consecutive processes: the phase separation and crystallization, and gelation by formation of a three-dimensional PET network in the oligomer solvents, where the nodes of the network are PET spherulites. The crystallinity of PET recovered from polymer/oligomer gels is near 72% measured by wide-angle X-ray diffraction method, which is about 20% higher than PET samples crystallized by solution crystallization in small molecule solvent, high temperature annealing, and stretching techniques. It takes only a few minutes to form the highly crystalline phase PET in the PET/oligomer system, and the crystallinity of the dried gel is independent of the concentration of the original solution. Excimer-fluoresence and Raman spectroscopic studies indicated that PET recovered from the gels are in an ordered state with few chain entanglements. The entanglement density of the recovered PET recovered from a 20 wt % solution in ethylene glycol oligomer is as low as that of freeze-extracted PET from a 0.5 wt % solution in phenol. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1219–1225, 1998 References and Notes 1(a) B. Wunderlich, Macromolecular physics, Vol. 2: Crystal Nucleation, Growth, Annealing, Academic Press, New York, (1976); (b) Z. Mo and H. Zhang, J. Macromol. Sci., Rev. Macromol. Chem. Phys. 1995, C35(3), 531. (c) F. Fakirov, E. W. Fischer, R. Hoffmann, and G. F. Schmidt, Polymer, 1977, 18, 81. (d) R. F. Saraf and R. S. Porter, Polym. Eng. Sci., 1988, 28, 842. (e) A. Miyagi and B. Wunderlich, J. Polym. Sci. Polym. Phs. Ed., 1972, 10, 2073. 2(a) S. Rabiej and W. Andrzej, Die Angewandte Makromolekulare Chemie, 1990, 175, 81. (b) J. P. Jog, J.M.S.-Rev. Macromol. Chem. Phys., 1995, C35(3), 531. 3 T. Asano, A. Dzeick-Pickuth, and H. G. Zachmann, J. Mater. Sci., 1989, 24, 1967. 4 C. M. Roland, Polym. Eng. Sci., 1991, 31, 849. 5 G. Farrow, D. A. S. Ravens, and I. M. Ward, Polymer, 1962, 3, 17. 6 F. J. Balt a-Calleja, O. Ohm, and R. K. Bayer, Polymer, 1994, 35, 4775. 7 U. Koncke and H. G. Zachmann, Macromolecules, 1996, 29, 6019. 8(a) M. Berghmans, S. Govaers, F. C. Schryver, and H. Berghmans, Chem. Phys. Lett., 1993, 205, 140. (b) M. Berghmans, S. Govaers, and H. Berghmans, Polym. Eng. Sci., 1992, 32, 1466. (c) B. Chung and A. E. Zachariades, in " Reversible Polymeric Gels and Related Systems," P. S. Russo, Ed., ACS Symp. Ser. No. 350, Washington DC, 1987, p. 22. (d) M. Pyrlik and G. Rehage, Angew. Makromol. Chem. 1973, 29/30, 471. 9(a) A. Hill and A. M. Donald, Polymer, 1988, 29, 1426. (b) S. Z. D. Cheng, S. K. Lee, J. S. Barly, S. L. C. Hsu, and F. W. Harris, Macromolecules, 1991, 24, 1883. 10 R. S. Stein and M. B. Rhodes, J. Appl. Phys., 1961, 31, 1837. 11 J. M. Haudin, in " Optical properties of Polymers," G. H. Meeten, Ed., Wiley-Interscience, New York, 1986. 12 R. S. Stein, in " New Methods of Polymer Characterization," B. Ke, Ed., Wiley-Interscience, New York, 1964. 13 J. L. Koenig and M. J. Hannon, J. Polym. Sci., Part B, 1967, B1, 119. 14(a) M. Djabourov and J. Leblond, in " Reversible Polymeric Gels and Related Systems," P. S. Russo, Ed., ACS Symp Sr. No. 350, Washington DC, 1987, p. 211. (b) S. J. Candau, Y. Dormoy, and E. Hirsh, in " Reversible Polymeric Gels and Related Systems," P. S. Russo, Ed., ACS Symp Sr. No. 350, Washington DC, 1987, p. 33. (c) Sn P. L. Biagio, J. Newman, F. Modonia, and M. U. Palma, in " Biomolecular Sterodynamics," R. H. Sarma, Ed., Adenine Press, Guilderland, 1986, Vol. 3, p. 277. 15 P. S. Russo, P. Magestro, and W. G. Miller, in " Reversible Polymeric Gels and Related Systems," P. S. Russo, Ed., ACS Symp. Sr. No. 350, Washington DC, 1987, p. 152. 16(a) M. E. Nichols and R. E. Robertson, J. Polym. Sci.: Part B. Polym. Phys., 1994, 32, 573. (b) S. S. Kim and D. R. Lloyd, Polymer, 1992, 33, 1026. (c) S. S. Kim and D. R. Lloyd, J. Membr. Sci., 1991, 64, 13. (d) P. Schaaf, B. Lots, and J. C. Wittmann, Polymer, 1987, 28, 193. 17 G. Ji, H. Ni, C. Wang, and G. Xue, Macromolecules, 1996, 29(7), 2691. 18 G. Xue, Y. Wang, X. Gu, and Y. Lu, Macromolecules, 1994, 27, 4016. 19 G. Xue, Y. Wang, and S. Liu, Macromolecules, 1995, 28, 4344. 20 G. Xue and Y. Wang, Macromolecules, 1995, 28, 3687. 21 B. Huang, M. Ito, and T. Kanamoto, Polymer, 1994, 35(6), 1210. 22(a) R. Qian, X. Jin, and H. Li, Sci. Sin., Ser. B., 1982, 15(2), 137. (b) S. Chen, F. Bai, and R. Qian, Sci. Sin., 1981, 14(5), 639. 23 P. De Gennes, J. Chem. Phys., 1971, 55, 572. 24 J. Klein, Macromolecules, 1986, 19, 105. 25 M. Doi, W. W. Graessley, E. Helfand, and D. S. Pearson, Macromolecules, 1987, 20, 1900. Citing Literature Volume36, Issue7May 1998Pages 1219-1225 ReferencesRelatedInformation