Using Gas Pycnometry to Determine Polymer Crystallinity

The crystallinity of polymers plays a key role in their properties. Gas pycnometry can be used to assess the skeletal density of polymer materials, which can then be related to the crystallinity. Extremely accurate volume measurements, like those performed with the Ultrapyc 5000, are required when determining relative crystallinity.

Quality control laboratories in  manufacturing require that material characterization be performed as quickly and accurately as possible. For many polymer materials, properties such as skeletal density and percent crystallinity are crucial for manufacturers to ensure their materials are consistent across batches.

Crystallinity affects the volume of a material and the degree of crystallinity can be detected using a technique such as gas pycnometry. The mass and measured volume of the sample are used to calculate the skeletal density. This correlates with the crystallinity of a material, where the higher the skeletal density, the more crystalline the material. If skeletal densities of the completely amorphous and completely crystalline formations are known, it is also possible to compute the percent of crystallinity of a given sample.

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