The potential of SEC in polymer characterization is very great, especially when this technique is combined with other modes of liquid chromatography. Multiple detection is in most cases inevitable: combinations of different concentration detectors provide information on copolymer composition, and molar mass-sensitive detectors can eliminate errors with inadequate calibrations. For complex polymers (with distributions in molar mass, chemical composi tion, functionality, etc.) one-dimensional techniques can, however, only provide part of the desired information. For these samples, multidimensional separations will be required. In most cases, one of the dimensions which will be SEC, while the other(s) could be gradient HPLC, or liquid chromatography at the critical point of adsorption (LCCC).

See also: II/Chromatography: Liquid: Derivatization; Detectors: Refractive Index Detectors; Evaporative Light Scattering Detectors in Liquid Chromatography. Detectors: Ultraviolet and Visible Detection; III/Polymers: Field Flow Fractionation.

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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