To improve the dispersion of silica in polypropylene（PP） matrix and to avoid physical loss of the antioxidants, nanosilica with dendric polyamidoamines on the surface（SG-PAMAM） was synthesized by using divergent m...To improve the dispersion of silica in polypropylene（PP） matrix and to avoid physical loss of the antioxidants, nanosilica with dendric polyamidoamines on the surface（SG-PAMAM） was synthesized by using divergent method. Then nanosilica-immobilized antioxidant（SG-PAMAM-AO） was prepared by grafting 2,6-di-tert-butyl-4-aminophenol which was derived from 2,6-di-tert-butyl-4-phenol（AO）. The SG-PAMAM-AO was added into PP by melt mixing to study the aging property. The oxidation induction time of PP/SG-PAMAM-AO and PP/AO compounds was measured. It was found that the antioxidant property of the SG-PAMAM-AO was superior to that of AO. According to the changes of carbonyl absorption before and after photo-thermal aging, the photo-thermal oxidative stability of PP/SG-PAMAM-AO was much higher than that of PP, PP/SG-PAMAM and PP/AO.展开更多
文摘To improve the dispersion of silica in polypropylene（PP） matrix and to avoid physical loss of the antioxidants, nanosilica with dendric polyamidoamines on the surface（SG-PAMAM） was synthesized by using divergent method. Then nanosilica-immobilized antioxidant（SG-PAMAM-AO） was prepared by grafting 2,6-di-tert-butyl-4-aminophenol which was derived from 2,6-di-tert-butyl-4-phenol（AO）. The SG-PAMAM-AO was added into PP by melt mixing to study the aging property. The oxidation induction time of PP/SG-PAMAM-AO and PP/AO compounds was measured. It was found that the antioxidant property of the SG-PAMAM-AO was superior to that of AO. According to the changes of carbonyl absorption before and after photo-thermal aging, the photo-thermal oxidative stability of PP/SG-PAMAM-AO was much higher than that of PP, PP/SG-PAMAM and PP/AO.
