How to calculate average molecular weight when degree of polymerization is given?
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The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomermolecule.
For a homopolymer, there is only one type of monomeric unit and the number-averagedegree of polymerization is given by {\displaystyle DP_{n}\equiv X_{n}={\frac .{M_{n}}{M_{0} where Mn is the number-average molecular weight and M0 is the molecular weight of the monomer unit. For most industrial purposes, degrees of polymerization in the thousands or tens of thousands are desired. This number does not reflect the variation in molecule size of the polymer that typically occurs, it only represents the mean number of monomeric units.
For a homopolymer, there is only one type of monomeric unit and the number-averagedegree of polymerization is given by {\displaystyle DP_{n}\equiv X_{n}={\frac .{M_{n}}{M_{0} where Mn is the number-average molecular weight and M0 is the molecular weight of the monomer unit. For most industrial purposes, degrees of polymerization in the thousands or tens of thousands are desired. This number does not reflect the variation in molecule size of the polymer that typically occurs, it only represents the mean number of monomeric units.
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