Effects of Superabsorbent Polymers (SAP) on Growth and Photosynthesis of Pepper Plants under Water Stress MICROWAVE-ASSISTED SYNTHESIS OF CHITOSAN-g-POLY(ACRYLIC ACID) SUPERABSORBENT POLYMERS Preparation and Characterization of Starch Grafting Acrylic Acid Superabsorbent via 10 MeV Electron-Beam Irradiation