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Real-time simultaneous wide- and small-angle fibre diffraction.

W Bras, G R Mant, G E Derbyshire

    Journal of Synchrotron Radiation
    |March 1, 1995
    PubMed
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    Researchers developed a powerful X-ray diffraction system for studying fast material changes. This system observed a stress-induced structural transition in high-density polyethylene from orthorhombic to monoclinic.

    Area of Science:

    • Materials Science
    • Crystallography
    • Polymer Science

    Background:

    • X-ray diffraction (XRD) is crucial for understanding material structures.
    • Studying time-resolved structural changes requires advanced, high-speed data acquisition.
    • High-density polyethylene (HDPE) exhibits complex structural behavior under stress.

    Purpose of the Study:

    • To develop and utilize a novel, powerful system for time-resolved X-ray diffraction.
    • To investigate transient structural transitions in oriented polymer samples.
    • To characterize the stress-induced phase transition in high-density polyethylene.

    Main Methods:

    • Integration of two independent imaging area-detector systems.
    • Control via a single, synchronized data-acquisition system.

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  • Application of tensile stress to induce structural changes in HDPE samples.

    • Main Results:

    • Successful observation of a transient structural transition.
    • Identification of an orthorhombic-to-monoclinic phase change.
    • Demonstration of the system's capability over a wide q range for time-resolved studies.

    Conclusions:

    • The developed XRD system is effective for studying rapid structural dynamics.
    • Tensile stress can induce a reversible orthorhombic-to-monoclinic transition in HDPE.
    • This methodology enables detailed investigation of oriented materials under dynamic conditions.