c the liquid product was dissolved in 5 ml of thf and the calb was filtered out using 0 45 u03bcm syringe filter the product solution was precipitated in 200 ml of hexane and diethyl ether mixture 1 1 ratio the white precipitate was collected and dried using vacuum pump the product of the synthesis provides the 1 h nmr spectrum of was fig4 wherein it shows the peg diacrylate the hydroxyl protons at u03b4 4 55 ppm from the ho peg oh completely disappeared and the peak corresponding to the methylene protons adjacent to hydroxyl group shifted downfield from u03b4 3 50 to u03b4 4 42 ppm c after the reaction the new peaks corresponding to the methine u03b4 6 19 ppm e and vinyl u03b4 6 38 ppm f and u03b4 5 92 ppm g protons of the acrylate group were observed at the expected positions with integral values of 2 1 1 1 c e f g confirming successful functionalization the 13 c nmr spectrum of the acrylation product also confirmed the structure of the polymer as shown in fig4 the carbons connected to the hydroxyl group in the starting material at u03b4 60 13 ppm shifted downfield to u03b4 63 89.