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The polyesterification reaction between maleic anhydride and 1,5-pentanediol, using p-toluenesulphonic acid as catalyst, was carried out. The material was characterized spectroscopically and its molecular weight measured. Besides isomerization of maleate to fumarate, some sort of intramolecular ring closure between polymer end groups may be occurring, since there is little agreement between molecular weight measurements by end group analysis and gel permeation chromatography, and very weak absorption is observed for hydroxyl group.
KeywordsFumarate Maleic Anhydride Unsaturated Polyester Polymer Bulletin Molecular Weight Measurement
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