| Weight Average Molecular Weight |
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where is the number of molecules of molecular weight . Intuitively, if the weight average molecular weight is ''w'', and you pick a random monomer, then the polymer it belongs to will have a weight of ''w'' on average. The weight average molecular weight can be determined by light scattering, Small Angle Neutron Scattering (SANS), X-ray scattering, and sedimentation velocity. An alternative measure of molecular weight for a polymer is the Number Average Molecular Weight ; the ratio of the ''weight average'' to the ''number average'' is called the Polydispersity index. The ''weight-average molecular weight'', ''M''w, is also related to the ''fractional monomer conversion'', ''p'', in Step-growth Polymerization as per Carothers' Equation : :, where ''M''o is the molecular weight of the repeating unit. |
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