Molecular weight and polymer properties

If the polymer property is dependent on the weight of each polymer molecule, the weight average molecular weight is  

These parameters are very important for the mechanical properties of the polymer. A high value of average molecular weight corresponds to high mechanical resistance (Gowariker et al., 1986). The polydispersity index (PDI) is a measure of the distribution of molecular mass in a given sample  

For a theoretical monodisperse polymer, PDI = 1, whereas PDI 1 for polydisperse polymers (Chanda and Roy, 2007). 

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Small proportions of mono- or polyfunctional aUyHc monomers also may be added as regulators or modifiers of vinyl polymerization for controlling molecular weight and polymer properties. Polyfunctional aUyHc compounds of high boiling point and compatibiHty are employed as stabilizers against oxidative degradation and heat discoloration of polymers. DiaUyl ammonium salt copolymers are used in water purification and flocculation. Compounds... 

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