fraction hmw1 the filtrate was distilled to dryness yielding another 530 g of product low molecular weight fraction lmw1 total yield was 1 102 g or 96 4 g of lmw1 was further fractionated by heating in a water methanol solution 20 water the soluble fraction lmw1a was separated from the insoluble filtered fraction lmw1b methanol water was distilled away from lmw1a hmw1 was fractionated into a high hmw1a and low molecular weight fraction hmw1b using a similar procedure with the exception that a 20 acetone methanol solution was used all of the fractions were analyzed by size exclusion chromatography sec to resolve the various polyindanebisphenol oligomers sec was conducted using a concentration of 5 6 mg of pibp in tetrahydrofairan a series of two polystyrene divinylbenzene columns 5 100a pl gel and 5 50a pl gel at a flow rate of 1 ml min with a hewlett packard hp1090 liquid chromatograph equipped with chem data station the separation method was adapted to apci sec mass spectroscopy ms using a finnigan tsq 7000 triple stage quadrapole apci atmospheric pressure chemical ionization infusion analysis in positive and negative ion mode was used on samples dissolved in thf using a concentration of 1 mg ml ms revealed a m z 158 oligomer series the highest molecular weight fraction hmw1a revealed an oligomer series having 3 8 repeating units the lowest molecular weight fraction lmw1a revealed an oligomer series having repeating units from 1 4 the medium molecular weight fractions hmw1b and lmw1b revealed a distribution having an oligomer series from n 2 6 with the combination of sec and ms the oligomer series was resolved such that the individual polyindanebisphenol repeating units could be identified as.