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Investigation on β‐polypropylene/PP‐ g ‐MAH/surface treated talc composites
Author(s) -
Duan Jiawei,
Dou Qiang
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39178
Subject(s) - talc , polypropylene , materials science , crystallization , differential scanning calorimetry , composite material , composite number , scanning electron microscope , izod impact strength test , compounding , polarized light microscopy , maleic anhydride , chemical engineering , ultimate tensile strength , polymer , copolymer , physics , optics , engineering , thermodynamics
β‐Polypropylene composites containing talc treated by titanate coupling agent (T‐talc) and maleic anhydride grafted PP (PP‐ g ‐MAH) were prepared by melt compounding. The crystallization, morphology, and mechanical properties of the composites were investigated by means of differential scanning calorimetry (DSC), wide angle X‐ray diffraction (WAXD), polarized light microscopy (PLM), scanning electron microscopy (SEM), and mechanical tests. It is found that β nucleating agent (NT‐C) induces the formation of β‐phase but T‐talc suppresses the formation of β‐modification. Both NT‐C and T‐talc greatly decrease the spherulitic size of PP. PP‐ g ‐MAH has a weak restraint on the formation of β‐form PP but it improves the compatibility between T‐talc and PP matrix. Izod notched impact strength of β‐PP/T‐talc composite is higher than that of PP/T‐talc composite at each loading, indicating the toughening effect of β‐PP. Incorporation of PP‐ g ‐MAH into β‐PP/T‐talc composite further increases the impact strength when T‐talc concentration is below 2.5 wt %. The non‐isothermal crystallization kinetics of β‐PP composites is well described by Jeziorny's and Mo's methods, respectively. The activation energies (Δ E ) of non‐isothermal crystallization were calculated by Kissinger method. It is found that NT‐C and T‐talc accelerate the crystallization rate of PP but PP‐ g ‐MAH has a slightly negative influence on the crystallization rate of β‐PP. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013