Modification of carbon black through grafting multihydroxyl hyperbranched polyether onto its surface

The hydroxy methyl groups were introduced onto the pristine carbon black surface through the reaction between unsaturated hydrogen atoms of the polycondensed aromatic rings of carbon black and formaldehyde in alkali condition. Using the resultant hydroxy methyl groups on the carbon black surface as the growth point, multihydroxyl hyperbranched polyether was grafted onto the carbon black surface by cationic ring‐opening polymerization of 3‐ethyl‐3‐(hydroxymethyl)‐oxetane in the presence of BF3·OEt2 to improve its dispersion ability in solvents. It was found that the modified carbon black could be dispersed in polar solvents, such as ethanol, chloroform, and DMF.