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Investigation on β‐polypropylene/PP‐ g ‐MAH/ surface‐treated calcium carbonate composites
Author(s) -
Duan Jiawei,
Dou Qiang
Publication year - 2012
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.22370
Subject(s) - materials science , polypropylene , crystallization , izod impact strength test , maleic anhydride , composite number , composite material , ultimate tensile strength , scanning electron microscope , differential scanning calorimetry , calcium carbonate , compounding , copolymer , chemical engineering , polymer , thermodynamics , physics , engineering
β‐Polypropylene composites containing calcium carbonate treated by titanate coupling agent (T‐CaCO 3 ) 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, wide‐angle X‐ray diffraction, polarized light microscopy, scanning electron microscopy and mechanical tests. It is found that both T‐CaCO 3 and NT‐C are able to induce the formation of β‐phase, and NT‐C greatly increases the β content and decreases the spherulitic size of PP. PP‐ g ‐MAH facilitates the formation of β‐form PP and improves the compatibility between T‐CaCO 3 and PP. Izod notched impact strength of β‐PP/T‐CaCO 3 composite is higher than that of PP/T‐CaCO 3 composite, indicating the synergistic toughening effect of T‐CaCO 3 and β‐PP. Incorporation of PP‐ g ‐MAH into β‐PP/T‐CaCO 3 composite further increases the content of β‐crystal PP and improves the impact strength and tensile strength when T‐CaCO 3 concentration is below 5 wt%. The nonisothermal crystallization kinetics of β‐PP composites is well described by Jeziorny's and Mo's methods. It is found that NT‐C and T‐CaCO 3 accelerate the crystallization rate of PP but the influence of PP‐ g ‐MAH on crystallization rate of β‐PP composite is marginal. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers