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β-Crystallisation tendency and structure of polypropylene grafted by maleic anhydride and its blends with isotactic polypropylene

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Abstract

Crystallization, melting and structure of three different commercial types of isotactic polypropylene (iPP) grafted by maleic anhydride (PP-g-MAH) with different maleic anhydride content (AC) and their β-nucleated versions were studied by X-ray diffractometry (WAXS), differential scanning calorimetry (DSC), polarised light microscopy (PLM) and scanning electron microscopy (SEM). The presence of maleic anhydride units disturbs the chain regularity, hereby decreases the crystallization tendency of iPP in general and the β-crystallisation ability in particular. β-modification of iPP (β-iPP) forms only in β-nucleated PP-g-MAH polymers studied if the anhydride content is not larger than 0.5 mass%. The influence of AC of PP-g-MAH on the feature the spherulitic structure is demonstrated by PLM and SEM micrographs. The β-nucleated iPP/PP-g-MAH blends containing 10 mass% PP-g-MAH crystallise predominantly in β-form independently of AC of the latter. The β-nuceated blends of iPP and PP-g-MAH with lowest AC crystallise in β-form in whole concentration range. The interaction parameter between iPP and PP-g-MAH polymers calculated by Nishi-Wang equation indicate limited interaction between the components.

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Authors and Affiliations

  1. Department of Physical Chemistry and Materials Science at Budapest University of Technology and Economics, Laboratory of Plastics and Rubber Technology, 1111, Budapest, Müegyetem rkp. 3. H. ép. I., Hungary

    A. Menyhárd, G. Faludi & J. Varga

  2. Institute of Materials and Environmental Chemistry, Chemical Research Center at Hungarian Academy of Sciences, 1025, Budapest, Pusztaszeri út 59-67, Hungary

    A. Menyhárd

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  1. A. Menyhárd
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  2. G. Faludi
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  3. J. Varga
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Correspondence to A. Menyhárd.

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Menyhárd, A., Faludi, G. & Varga, J. β-Crystallisation tendency and structure of polypropylene grafted by maleic anhydride and its blends with isotactic polypropylene. J Therm Anal Calorim 93, 937–945 (2008). https://doi.org/10.1007/s10973-007-8569-7

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  • DOI: https://doi.org/10.1007/s10973-007-8569-7

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