GRAFTING ONTO CARBON BLACK HAVING FEW FUNCTIONAL GROUP 3.

GRAFTING REACTION OF IMIDAZOLINE GROUPS INTRODUCED ONTO CARBON BLACK SURFACE WITH SEVERAL FUNCTIONAL POLYMERS

Abstract

The grafting onto furnace black and acetylene black by the reaction of imidazoline groups introduced onto these carbon blacks with functional polymers having acyl chloride or epoxide groups was investigated. The introduction of imidazoline groups onto the surface was achieved by the treatment of carbon black with 2, 2′-azobis[2-(2-imidazolin-2-yl) propane]. Even if furnace black and acetylene black were reacted with acylchloride-capped poly(propylene glycol) (PPG-COCl), no grafting of PPG onto these carbon blacks was observed. On the contrary, when PPG-COCl was reacted with carbon black having imidazoline groups, PPG was found to graft onto the surface with amide bonds. The percentage of grafting increased with an increase of imidazoline group content of carbon black: the percentage of grafting of PPG onto Philblack I (imidazoline group content=0.30 mmol/g) was increased to 21.8%. The polymer-grafted carbon black gave a stable colloidal dispersion in organic solvents. The amount of imidazoline groups used for the grafting reaction was found to decrease with increasing molecular weight of PPG-COCl. Furthermore, the effect of temperature on the grafting reaction was discussed. In addition, the grafting of poly (glycidyl methacrylate-co-styrene) onto furnace black was achieved by the reaction of imidazoline groups on the surface with epoxide groups of the copolymer.