Detector Response to Low Molecular Weight Components

The differential refractive index for a polymer/solvent combination is normally independent of molecular weight at high molecular weight. However, while it is generally known that the refractive index detector response varies with low molecular weight polymers this variation is commonly ignored. As a consequence, SEC results for polymers containing low molecular weight material often do not give an appropriate consideration to the low molecular weight components; this has important implications for many legislative requirements for defining the proportion of low molecular weight material present.

The variation in refractive index response with molecular weight is presumed to be due to the increasing influence of end groups and it seems probable that there are similar effects with most other detector types. For the evaporative light scattering detector, there is similarly the possibility that the more volatile components are lost with the solvent.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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