G. FaludiLaboratory of Plastics and Rubber Technology Department of Physical Chemistry and Materials Science at Budapest University of Technology and Economics 1111 Budapest Müegyetem rkp. 3. H. ép. I. Hungary
J. VargaLaboratory of Plastics and Rubber Technology Department of Physical Chemistry and Materials Science at Budapest University of Technology and Economics 1111 Budapest Müegyetem rkp. 3. H. ép. I. Hungary
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.