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Irreversible structural changes in cryogenic mechanically milled isotactic polypropylene

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Abstract

The influence of cryogenic mechanical milling on the structure and the thermal behavior of isotactic polypropylene was investigated by means of wide-angle X-ray scattering, differential scanning calorimetry and transmission electron microscopy. The results presented show that structural changes caused by mechanical milling at cryogenic temperatures are only partly reversible. The decrease in the degree of crystallinity as determined by differential scanning calorimetry with increasing milling time is attributed to a reversible transformation of the initial morphology into a “nanostructured” morphology, consisting of small “fragments” of the original isotactic polypropylene lamellae. During recrystallization from the molten state, there still exists an influence of the previous milling treatment, leading to significantly changed crystallization behavior. The reason for this behavior might be a decrease in the molecular weight or a change in the molecular weight distribution or the formation of long-chain branched polypropylene molecules induced by cryogenic mechanical milling.

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Notes

  1. The crystallinity values χ cm and χ cc were determined by integration of the melting or crystallization peak areas and normalizing the resulting enthalpy values ΔH m or ΔH c to the specific enthalpy \( \Delta H^{{\text{0}}}_{{\text{m}}} \). The value \( \Delta H^{{\text{0}}}_{{\text{m}}} {\left( {{\text{iPP}}} \right)} = 209\;{\text{J}}/{\text{g}} \) was taken from the literature [21]

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Acknowledgements

This work was supported financially by the Deutsche Forschungsgemeinschaft (DFG Pe 220/25-1). The authors thank Henrike Bank for her help with some of the experimental work.

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  1. Werkstoffkunde, Fachbereich Chemietechnik, Universität Dortmund, Emil-Figge-Str. 66, 44227, Dortmund, Germany

    Michael Stranz & Uwe Köster

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  1. Michael Stranz
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  2. Uwe Köster
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Correspondence to Michael Stranz.

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Stranz, M., Köster, U. Irreversible structural changes in cryogenic mechanically milled isotactic polypropylene. Colloid Polym Sci 282, 381–386 (2004). https://doi.org/10.1007/s00396-003-0953-7

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  • DOI: https://doi.org/10.1007/s00396-003-0953-7

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