The synthesis and characterization of random copolyesters with birefringent behavior
Four random copolyesters were synthesized by the polycondensation technique. The first copolymer, poly[oxy(2-bromo-l,4-phenylene)oxyterephthaloyl- co-oxy(2,2'-biphenylene)oxyterephthaloyl], PU1, was made by polyesterification of o,o'-biphenol, bromohydroquinone and tere phthaloyl chloride...
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| Format: | Others |
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DigitalCommons@Robert W. Woodruff Library, Atlanta University Center
1988
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| Online Access: | http://digitalcommons.auctr.edu/dissertations/1489 http://digitalcommons.auctr.edu/cgi/viewcontent.cgi?article=3082&context=dissertations |
| Summary: | Four random copolyesters were synthesized by the polycondensation technique. The first copolymer, poly[oxy(2-bromo-l,4-phenylene)oxyterephthaloyl- co-oxy(2,2'-biphenylene)oxyterephthaloyl], PU1, was made by polyesterification of o,o'-biphenol, bromohydroquinone and tere phthaloyl chloride in a molar ratio of 2:1:3. Bromohydroquinone was substituted by phenylhydroquinone in the preparation of PU2. All other conditions remained the same. No remarkable differences were found between PU1 and PU2 in thermal properties.
PU3 and PU4 followed similar synthetic routes. In the synthesis of PU3, bromohydroquinone, terephthaloyl chloride, and 1,4-phenylenediacetyl chloride were reacted in a molar ratio of 2:1:1. Chlorosubstituted hydroquinone was used in the making of PU4. The polymers were characterized by IR and NMR spectroscopy, solubility, DSC, optical polarizing microscopy, GPC and viscometry. |
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