Web27 jun. 2024 · The number-average degree of polymerization is a weighted mean of the degrees of polymerization of polymer species, weighted by the mole fractions (or the … Web11 jun. 2024 · The definition of average functionality presented above holds strictly when functional groups of opposite kinds are present in equal concentrations. If there is …
Polymer Chemistry: Molecular Weight Averages
WebIn 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. Web22 jul. 2024 · The number-average degree of polymerization is the weighted mean of degrees of polymerization, ... In this case, the DP of polymers will depend on the average functionality of the monomer f av. The f av for a given reaction can be calculated as: The modified Carothers equation for branched step polymerization will be: Degree of ... cheapassleads.com reviews
Number Average Molar Mass - an overview ScienceDirect Topics
WebThe number-average functionality is proposed a simplified equation which can be used to predict the reaction progress of the stepwise polymerization expediently. According to … WebFrom the expressions above, the number average molecular weight Mncan be easily calculated: Mn= m N0/ N= m / (1- p) where mis the molecular weight of a mer unit. weight-average molecular weight Mwcan be calculated as follows:3 Mw= ∑xwxMx=m (1- p)2∑xx2px-1 = m (1+ p) / (1- p) = (1+ p) Mn WebNumber-Average Degree of Polymerization as a Function of the Stoichiometric Ratio The Figure above shows the effect of stoichiometric imbalance and conversion on the … cute drawings of people bffs