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Molecular Weight Analysis


Polymers inherently have a distribution of chain lengths resulting in a molecular weight distribution. The molecular weight distribution influences the properties of the polymer during processing and in the application. For instance, lower molecular weight chains help improve melt processing, while the higher molecular weight fraction can be critical to mechanical properties. A variety of molecular weight analysis techniques specific to material type, industry served and information required are used at Polymer Solutions incorporated. We will help you choose the one that is right for you.

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Comparison of Molecular Weight Analysis Techniques



There are a variety of reasons why molecular weight analysis could be important when dealing with polymer systems. Choosing the right method to give you the most relevant information is critical.

The method that provides the most information regarding the molecular weight of a polymer is GPC or SEC, different names for the same technique. GPC provides you with the molecular weight distribution and depending on the type of calibration will provide you with relative molecular weight values to known standards or absolute molecular weights. This method can be used for determining the level of low molecular weight chains for instance in the range of 1,000 g/mole or less by using a slice table methodology for the calculations.

In some instances the requirement is to measure a material per a specification which calls for a melt flow index value. One of the most broadly useful techniques for comparing or specifying molecular weight limits is dilute solution viscosity. IV is a term often used interchangeably for both inherent viscosity and intrinsic viscosity. Either of these values can be used for specification purposes or release purposes but they will not provide you the critical distribution information that may be required in initial research investigations or in full qualification of a material.

Solubility of the polymer material to be tested is a critical parameter to be determined when choosing an analytical method for measuring molecular weight. Polymer Solutions Incorporated has the capability to identify an appropriate solvent system for your material. We commonly perform molecular weight analyses for a variety of purposes on nylons, polyesters, polyolefins, cellulose derivatives, polypeptides, and a variety of other polymers and copolymer systems.

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