Graft Copolymerization Of Methyl Acrylate Onto Carbon Black Initiated By Potassium Diperiodatonickelate (IV)Author(s): Yinghai Liu, Weiqi Zhou, Libin Bai, Yanxiang Li
The graft copolymerization of methyl acrylate onto hydroxymethylated carbon black (HCB) using potassium diperiodatonickelate (DPN) as initiator has been studied. The effects of different reaction variables on grafting parameters, such as the water-to-dioxane ratio, the reaction time and temperature, the ratio of monomer-to-carbon black, initiator concentration, are investigated, and the graft conditions were optimized. The maximum graft efficiency and percentage of graft are 47.7% and 128.2%. The DPN-HCB pair is confirmed to be an efficient redox system for the graft copolymerization. A single electron transfer mechanism was proposed to explain the formation of radicals and the initiation. The graft copolymer is characterized by scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR) and ultraviolet visible spectrophotometer. Through the SEM and UV spectrophotometer it is testified that the grafted HCB is much better than the carbon black in dispersive and consistent ability. The grafted HCB was blended into polyvinyl chloride (PVC) to improve the impact strength of PVC.