The molecular weight distribution of coal extracts. Coalification is not a condensation polymerization

Details The molecular weight distribution of coal extracts. Coalification is not a condensation polymerization The molecular weight distribution of coal extracts. Coalification is not a condensation polymerization

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..135l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 1, pp.135-141

Computer Science

Scientific paper

The pyridine extracts from Bruceton and Illinois No. 6 coals were fractionated using gel permeation chromatography and the molecular weight of each fraction was measured using vapor pressure osmometry. If, as has been suggested, coalification is a simple condensation polymerization from a mixture of monomers with gel formation, then as the molecular weight of the components increase, their concentration should decrease. Exactly the opposite behavior is observed. The number average molecular weights for the Bruceton and Illinois No. 6 extracts respectively are 860 daltons and 1100 daltons while the corresponding weight average molecular weights calculated from the molecular weight distribution are 2300 daltons and 2700 daltons.

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