ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The polyesterification of 1,3-(dicarboxymethoxy)benzene with tetraethylene glycol in both equimolar and nonequimolar ratios were studied over the range of 120-160°C in the absence and presence of p-toluenesulphonic acid as catalyst. The experimental results for uncatalyzed reactions agreed quite well with the kinetic equation proposed by Flory. The kinetic equations for acid-catalyzed reactions, however, are in agreement with the kinetic equation proposed by Lin and Hsieh. The kinetic equations were -d[COOH]/dt = k1[COOH]2[OH] and -d[COOH]/dt = k2[COOH]2 for uncatalyzed and acid-catalyzed polyesterfications, respectively. The rate constants for uncatalyzed and acid-catalyzed reactions were calculated by using the method of least squares for various values of initial molar ratio between [OH] and [COOH]. Also, the activation energies were calculated.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1989.070380714
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