BHBTBar Harbor Banking and Trust (Maine; banking services)
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The number average molecular weight of the oligomeric BHBT is determined using gel permeation chromatography after repeated recrystallization from water.
About 15 mL of chloroform is added into the vial and then the mixture was heated under reflux until the oligomeric BHBT has been completely dissolved (10--20 min), appropriate amount of ethylene glycol and 15 mL water are added and the mixture is shaken vigorously, then standing still and demixing.
The masses of the solute and oligomeric BHBT are measured with an analytical balance (type Mettler H542).