• composites;
  • poly(propylene);
  • structure


Poly(propylene) (PP)/chlorinated PP (CPP)/multiwalled carbon nanotube (MWNT) composites are prepared via melting blend with a MWNT masterbatch obtained by a solution process under ultrasonic irradiation. The effects of ultrasonic irradiation on the microstructure and the electric properties of the PP/CPP/MWNT composites are systematically investigated through a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), wide-angle X-ray diffraction (WAXD), and rheological measurements. Ultrasonic irradiation can remarkably decrease the volume resistivity of the PP/CPP/MWNT composites. The results of SEM and TEM show that the ultrasonic irradiation is beneficial to the dispersion of MWNTs in the PP/CPP/MWNT composites and the exfoliation of the MWNT agglomerates. When the MWNT content is more than 3.0%, ultrasonic irradiation can evidently increase the percent crystallinity of the PP/CPP/MWNT composites. The introduction of ultrasonic irradiation can increase the elastic modulus (G′), viscous modulus (G″), and complex viscosity (η*) of the PP/CPP/MWNT composites at low frequency. Ultrasonic irradiation is also shown to improve the interfacial adhesion of MWNT and the interaction between the PP matrix and MWNT. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013