Analysis of the crystallinity rate in laboratory

You want to analyze the crystallinity rate of your polymers?

What is the crystallinity rate?

The crystallinity rate is a measure of the proportion of crystalline material in the sample studied.

There are three types of crystallinity rate:

mass, noted ϰm, defined by the ratio of mass of the crystalline phases to the mass of the sample
volumetric, noted ϰv which, in the same way as the preceding one, is defined by the ratio of volume of the crystalline phases to the volume of the sample
and finally, molar defined by the ratio of the number of moles of crystalline phases to the number of moles of the sample

A crystallinity rate can vary between 10% and 80%. A higher crystallinity rate is only possible with molecules with low molar mass and/or specially annealed samples.

Thus, here are some examples of polymers with different crystallinity rates:

  • Polyoxymethylene (POM copolymer); 75% crystallinity
  • Polybutylene terephthalate (PBT); 40%-50% crystallinity
  • Polyethylene terephthalate (PET); Crystallinity 30%-40%.

The crystallinity of a polymer depends on several factors: the cooling conditions, the additives used, the flow conditions during solidification and finally, the fillers mixed with the polymer.

Why analyze the crystallinity rate?

The rate of crystallinity is an important parameter whose evolution translates a modification of the microstructure, and consequently, of the properties of the material (density, Young’s modulus, elongation at break, plastic shrinkage, etc.). ).

Thus, the rate of crystallinity influences the optical, mechanical, thermal and chemical properties of the polymer. Moreover, the crystallinity rate also allows to appreciate the amorphous and crystalline contributions of the studied material.

The FILAB laboratory offers a wide range of diversified techniques for the analysis of the crystallinity rate of your polymers.

For more than 30 years, our laboratory FILAB has had the experience and the specific analytical equipment to support industrial companies in the analysis of crystallinity levels.

The support of a laboratory of experts in analysis such as FILAB enables you to better understand the strategic issues and changes in your sector. Our specialized engineers will accompany you throughout the crystallinity measurement protocol on your polymers in the laboratory. They are at your disposal to answer your questions and to help you interpret the results of the analysis obtained after the crystallinity rate of your polymers. 

The positive aspects of FILAB

  • A highly qualified team

  • Responsiveness in responding to and processing requests

  • A complete analytical park of 2100m²

  • Tailor-made support

Thomas GAUTIER Head of Materials Department
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