Non-uniform crystalline state of a PET bottle

By analyzing 2D diffraction patterns, information about the preferred orientation of crystals as well as the degree of orientation in PET (polyethylene terephthalate) plastic bottles can be obtained.

Background

PET (polyethylene terephthalate) plastic bottles must have mechanical strength to resist heat and mechanical shock, and this strength is said to depend on the degree of crystallinity and crystal orientation. As PET is a crystalline polymer, powder XRD can serve as a method to evaluate the degree of crystallinity and crystal orientation.

Two-dimensional (2D) diffraction patterns can be easily obtained by directing X-rays at a sample and collecting the diffracted beams with an imaging plate (IP) 2D detector or a 2D semiconductor detector. If the orientation of the crystals is random, the diffraction image shows a uniform ring pattern. However, if some preferred orientation is present, the image is in the shape of an arc.

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The D/MAX RAPID II is arguably the most versatile X-ray area detector in the history of materials analysis. In production for well over a decade and continuously improved during that time period, the success of the RAPID II is a testament to the suitability of imaging plate technology for measuring diffraction patterns and diffuse scattering from a wide range of materials. Read more...

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