was further sealed with Teflon tape. The reaction temperature was
maintained at requisite temperature. The reaction mixture was
stirred occasionally; the reaction was continued for various time
intervals and then terminated by injecting 0.5 mL of saturated aqueous
hydroquinone solution. The reaction product was precipitated
in excess of isopropanol and filtered through sintered glass filter.
The precipitate was again slurried in acetone followed by filtration
and finally the precipitate was dried in vacuum oven at 40 ◦C.
The resulting product was soxhlet extracted with benzene for 72 h
to extract the homopolymer, i.e., poly methylmethacrylate. The
remaining product was again purified by soxhlet extraction with
methanol until a constant weight was obtained. Reaction optimization
was done by varying reaction parameters. Percentage grafting
(PG) and efficiency (%GE) were calculated by the following equations