Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
Volume 50, Issue 5, Pages 831-845Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00222348.2010.483392
Keywords
beta crystalline form; composite; malonic acid; nano-calcium carbonate; polypropylene
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Funding
- Foundation for Young Scholars in Nanjing University of Technology
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The influence of malonic acid (MA) treatment of nano-calcium carbonate (CaCO3) on the crystallization, morphology, and mechanical properties of isotactic polypropylene (iPP)/nano-CaCO3 composites have been studied. The results of differential scanning calorimetry (DSC), wide angle X-ray diffraction (W Lambda XD) and polarized light microscopy (PLM) show that untreated nano-CaCO3 facilitates the formation of alpha phase, while MA treated nano-CaCO3 increases the relative content of beta phase of iPP dramatically. The results of scanning electron microscopy (SEM) show that MA treated nano-CaCO3 has better dispersion in the matrix than the untreated one. The toughness of PP/MA treated nano-CaCO3 composite is improved drastically. When 2.5 wt% MA treated nano-CaCO3 is added, the Izod notched impact strength reaches its maximum, which is 2.89 times greater than that of the pure iPP.
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