polymer molecular weight distribution and definitions of mw averages technical overview introduction polymers consist of repeat units monomers chemically bonded into long chains understanding the physical properties of a polymer ...
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...Polymer molecular weight distribution and definitions of mw averages technical overview introduction polymers consist repeat units monomers chemically bonded into long chains understanding the physical properties a such as mechanical strength sol ubility brittleness requires knowledge length chain is often expressed in terms relat ed to relative mass number con nected however all synthetic are polydisperse that they contain unequal so not single value exists lengths weights must therefore be described some average mol ecular calculated from sample this describes commonly used can determined by gel permeation chromatography gpc size exclusion chromatogra phy sec how defined classical methods originally measure them mn statistical snm i sni where m n predicted polymerization mechanisms mea sured determine molecules given for example colligative end group assay if quoted there equal numbers on either side veried agilent innity system compared takes account determin ing contributions more ...