Synthesis of 4-Arm Starlike Cationic Polymer and its Application as Fixing Agent for Dissolved and Colloidal Substances
A range of novel cationic starlike polymers (poly(Pen-g-MeDMA) were synthesized through atom transfer radical polymerization (ATRP) by core-first method. The tetrafunctional initiator (Pen-Br) was prepared by esterification of pentaerythritol with 2-bromoisobutyryl bromide. [2-(methacryloyloxy)ethyl] trimethyl ammonium chloride (MeDMA) was polymerized in H2O/EtOH medium using Pen-Br, Cu(I)Br, 2,2-dipyridine as an initiator, catalyst, and ligand respectively. The results indicated that the cationic charge density of the poly(Pen-g-MeDMA) were high and pH-insensitive. The poly(Pen-g-MeDMA) could be used as a cationic fixing agent to remove dissolved and colloidal substances from pulp, markedly improving the efficiency of retention aids.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
Q. Yang et al., "Synthesis of 4-Arm Starlike Cationic Polymer and its Application as Fixing Agent for Dissolved and Colloidal Substances", Advanced Materials Research, Vols. 233-235, pp. 128-131, 2011