Abstract
Polynorbornene (PNB) having methyl ester in side chain was partially hydrolyzed under alkaline condition in mixed organic solvents containing tetramethylammonium hydroxide as a base. Through hydrolysis of methyl ester group in PNB under basic condition, PNB having carboxylic acid can be obtained and degree of hydrolysis (DH) were evaluated by 1H NMR measurement from 0.1 to 0.8, depending upon reaction conditions such as reaction time, solvent, and amount of base. The resulting hydrolyzed PNB were characterized by differential scanning calorimetry, Fourier transform infrared spectroscopy, and size exclusion chromatography. No remarkable decreasing of molecular weight was observed and chain scission does not occur during the hydrolysis of PNB in the reaction condition examined here. The glass transition temperature of hydrolyzed PNB increased with increase in DH which can be attributed to the existence of intermacromolecular association of carboxylic acid in hydrolyzed PNB. Esterification of PNB having carboxylic acid was also carried out by using alkyl halide and DBU.
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