Grafting of Functional Polymers onto Reactive Carbon Black Having Chlorotriazinyl Groups

Abstract

The grafting of various polymers onto reactive carbon black, based on the reaction of chlorotriazinyl groups introduced onto the surface with functional polymers, was investigated. The introduction of chlorotriazinyl groups onto carbon black was achieved by the reaction of 2,4,6-trichloro-1,3,5-triazine with phenolic hydroxyl groups on the surfaces of carbon blacks. The amount of chlorotriazinyl groups introduced onto carbon black Neospectra II was determined to be 0.12 meq g−1. This value corresponds to about 50% of the phenolic hydroxyl groups on the carbon black. The chlorotriazinyl groups easily reacted with polypropylene glycol (PPG), silicone diol (SDO), silicone diamine (SDA) and polyethyleneimine (PEI) to give polymer-grafted carbon blacks. The percentage of grafting of PPG (Mn=2.0×103) and PEI (Mn=1.8×103) was estimated to be 23.6% and 45.7%, respectively. The percentage of grafting of polymers increased with an increase in molecular weight, but the number of grafted polymer chains decreased. The polymer-grafted carbon black obtained from the reaction gave a stable colloidal dispersion in tetrahydrofuran.