Determination of Changes in Crystallinity of Sample Occurring When
Stretched by the Use of Wide Angle X-ray Diffraction

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Summary

The crystallinity and orientation of a sample of polymer such as polyolefin when stretched are evaluated by carrying out X-ray diffraction (XRD) while stretching and holding the sample.

Example of determination

Changes in the crystallinity and orientation of a PP-based rubber sheet that occur when it is stretched

Sample size: Width: 7mm or less
Length: 26mm or more
Thickness: 2mm or less
Stretching ratio: 1 times (0% deformation) – 6 times (500% deformation)
Stretching rate: 1~1000μm/sec

* Separate consultation to be held about sample
 processing, pretreatment and determination conditions.

Explanation

  • Generally, as the stretching ratio increases, both orientation and crystallinity rise.
  • In the present determination, it is found that the rate of rise in orientation is somewhat high in the initial stage of stretching, while the degree of crystalliinity rises linearly.

Search Number 1022

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