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FTIR spectra of maize starch (MS), acrylamide grafted maize starch (Pam-g-MS), and hydrolyzed polyacrylamide grafted maize starch (HPam-g-MS). In the spectrum of Pam-g-MS the peaks at 3634.01 cm −1 , 3399.45 cm −1 and 3206.08 cm −1 are observed, which can be assigned to the overlap of N H stretching band of amide groups of acrylamide and
Chemicals Ltd., India respectively. Xanthan gum (XG), pregelatinized starch and partially hydrolyzed polyacrylamide (PHPA) were procured from Oil & Natural Gas Corporation Ltd. (ONGC), India. Shale sample was collected from Damodar Valley basin, India. 2.2. Synthesis of polyacrylamide-grafted-polyethylene glycol/silica nanocomposite
