ISSN:
0887-624X
Keywords:
polyarylate
;
polycondensation
;
mechanism
;
catalysts
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Alternate syntheses of polyarylate from dimethyl iso/terephthalate (DMI/DMT) and bisphenol-A (BPA) or bisphenol-A diacetate (BPAOAc) were investigated using a variety of catalysts. The model exchange of DMT with 4-t-butylphenol with loss of methanol proceeded moderately rapidly at rather low temperature (170°C) to produce to mono- and di-t-butylphenyl terephthalates. Dibutyltin oxide is the preferred catalyst. Alkali metal phenoxides are almost as effective but were less soluble. The model reaction of DMT with 4-tert-butylphenyl acetate involving loss of methyl acetate gave comparable results using dibutyltin oxide as catalyst. Based on these model results, polycondensations of DMI/DMT with BPAOAc under optimal conditions, gave polyarylate having an inherent viscosity 0.34 dL g-1 in quantitative yield and light brown color. Polycondensation with BPA was unsatisfactory in terms of yield, molecular weight, and color.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1992.080300110
