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Synthesis, characterization, and ring opening polymerization of poly(1,4-cyclohexylenedimethylene terephthalate) cyclic oligomers

✍ Scribed by Xin-Hua Wan; Yi Yang; Hui-Lin Tu; Lan Huang; Samuel Tan; Qi-Feng Zhou; S. Richard Turner

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
103 KB
Volume
38
Category
Article
ISSN
0887-624X

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✦ Synopsis

Cyclic oligomers of poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) were prepared by reaction of 1,4-cyclohexanedimethanol (CHDM) with terephthaloyl chloride under diluted conditions and separated from the linear products by silica gel column at a yield of 23.7 wt %. Cyclic dimer, trimer, tetramer, pentamer, and hexamer were further separated by high performance liquid chromatography, and found to constitute 98% of the cyclics mixtures. The structures of PCT cyclics were confirmed by means of mass spectrometry, Fourier transform infrared, and 1 H NMR analysis. A series of experiments were carried out to study the effects of catalysts and cis/trans configuration of isomers of CHDM on the yield of cyclic oligomers. Ring opening polymerization of the cyclic oligomers was carried out by heating the sample mixtures at 310 °C for 30 min in the presence of antimony oxide. Polymerization was confirmed by inherent viscosity changes and infrared spectra of the resulting polyesters.

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