| http://www.w3.org/ns/prov#value | - FIG. 2 is a graph of the molecular weight (???103) of CPP:SA copolymers polymerized by melt polycondensation in the presence of no catalyst or 2 mole % catalyst: calcium oxide, barium oxide, calcium carbonate and cadmium acetate, as a function of time of polymerization in minutes.
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