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Grafting polymerization is a valuable method for the modification of the chemical and physical properties of polymer surfaces. In this paper, the grafting of cationic vinyl monomer with quaternary ammonium groups, i.e., methacryloxyethyltrimethyl ammonium chloride (DMC), onto the isotactic polypropylene (iPP) granule was performed by the suspension solid-state grafting process. The technique offers new opportunities in modification of polyolefins, which has advantages of being solventless and having a lower process temperature. The grafted PP [PP-g-(St-co-DMC)] was systematically characterized by using various analytic tools including Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The FTIR spectra of the grafted iPP confirmed that DMC was successfully grafted onto the iPP backbone. The results of TGA and the hydrophilicity measurement indicated that the thermal stability of the grafted iPP was enhanced remarkably, and the hydrophilicity was also enhanced due to the addition of hydrophilic quaternary ammonium groups. Furthermore, the mechanical properties effect of PP-g-(St-co-DMC) on PP/poly(vinyl chloride) (PVC) blends was investigated. The measurements of tensile strength and impact strength indicated that the PP-g-(St-co-DMC) could remarkably enhance compatibility of PP/PVC blends. The tensile strength and the impact strength of PP/PVC blends with a concentration of PP-g-(St-co-DMC) at 4% (wt) increased up to 19.15% and 74.48%, respectively.

Cationic vinyl monomer-grafted polypropylene preparation and its use as a compatibilizer for polypropylene/poly(vinyl chloride) blends