Beta-crystallisation tendency and structure of polypropylene grafted by maleic anhydride and its blends with isotactic polypropylene

Kállay-Menyhárd, Alfréd and Faludi, Gábor and Varga, József (2008) Beta-crystallisation tendency and structure of polypropylene grafted by maleic anhydride and its blends with isotactic polypropylene. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 93 (3). pp. 937-945. ISSN 1388-6150

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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 beta-nucleated versions were studied by X-ray dif actometry (WAXS), differential scanning calorimetry (I)SC), polarised light microscopy (PLM) and scanning electron microscopy (SEM). The presence of maleic anhydride units disturbs the chain regularity, hereby decreases tie crystallization tendency of iPP in general and the P-crystallisation ability in particular. P-modification of iPP (beta-iPP) forms only in P-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 beta-nucleated iPP/PP-g-MAH blends containing 10 mass% PP-g-MAH crystallise predominantly in beta-form independently of AC of the latter. The beta-nuclcated blends of iPP and PP-g-MAH with lowest AC crystallise in P-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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