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Calculation of molecular parameters for stepwise polyfunctional polymerization
Author(s) -
Miller Douglas R.,
Valles Enrique M.,
Macosko Christopher W.
Publication year - 1979
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760190409
Subject(s) - polymerization , materials science , molar mass distribution , chain (unit) , polymer chemistry , mass fraction , fraction (chemistry) , thermodynamics , viscosity , intrinsic viscosity , degree of polymerization , molecule , polymer , chemistry , organic chemistry , physics , composite material , astronomy
Our recursive method is extended to calculate several new parameters for stepwise polyfunctional polymerization. In the pregel region we calculate weight average molecular weight, M w , for polydisperse reactants and effective average functionality, f e , of a reacting mixture. These quantities are useful for systems employing reactive oligomers. We also calculate weight average number of branches per molecule, B w , and the weight average of a longest chain. These should be useful for viscosity relations. In the postgel region we give relations for the extent of reaction in the soluble fraction. This result can be used to calculate sol properties directly from existing pregel relations. We also calculate the weight fraction of pendant chains on the gel, w p , and the average molecular weight of the elastically effective network chains, M c , w .