INTRODUCTION OF CATIONIC GROUPS ONTO CARBON BLACK SURFACE AND THEIR DISPERSIBILITY IN WATER

ABSTRACT

Imidazoline hydrochlonde groups were successfully introduced onto carbon black surface by the treatment of imidazoline groups, which were introduced by the trapping of 2-(2-imidazolin-2-yl)propane radicals formed by the thermal decomposition of 2,2'-azobis[2-(2-imidazolin-2-yl)propane] (AJP) with hydrochloric acid. In addition, arrridine hydrochlonde groups were introduced onto carbon black surface by the radical trapping of 2-methylpropionamidine dihydrochloride radicals formed by the thermal decomposition of 22'-azobis(2-methylpropionamidine) dihydrochloride (AMPAD). The content of imidazoline hydrochlonde and amidine hydrochlonde groups introduced onto carbon black was determined to be 0.6 mmol/g and 0,7 mmol/g, respectively. The mean particle size of AIP/HCl-lreated and AMPAD-treated carbon black was determined to be 31 nm and 16 nm, respectively, by dynamic light scattering method. It was found that the surface of carbon black turned from hydraphobic to hydrophilic by the introduction of cationic moieties and gave a very stable colloidal dispersion in neutral and acidic water at room temperature.

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Masaki Okazaki

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