Authors : Sihama Issa Salih, Fadhel Abbas Hashem and Auda Jabbar Braihi
Abstract: Synthesize Super Absorbent Polymer Nano Composites (SAPNCs) is done by addition of three nano materials individually to the neat blend which formed from carboxymethyl cellulose, starch and alum as cross-linker. These materials are nano Graphite Oxide (GO) Silica Nano Particles (SNP) and nano Hydroxy Apatite (HA). SAPNC with nano GO showed higher absorption capacity (69 g) than those prepared from SNP (64 g) and from HA (59 g), therefore, several samples of SAPNC were prepared with 0.1, 0.2, 0.3, 0.4 and 0.5 wt.% nano GO. Many tests suggest that GO with the neat blend forming a structure similar to the molecular sieves with an entrance which enhance water molecules to enter to the new structure which is responsible for the above increment beside the hydrogen bonding formation. As the GO concentration increased and reached the maximum absorbency at 0.3%. After that the absorbency decrease. This is due to the excess GO which partially or completely plug the entrance of structure. Sodium chloride effect on the swelling behaviors of GO-SAPNA was studied and showed absorption reduction with the increasing of the ionic strength of surrounding media. Results showed that SAPNC with 0.3 wt.% nano GO have highest free swelling ratio, highest Absorbency Under Load (AUL) and lowest re-swelling ability while SAPNC with 0.5 wt.% of nano GO have the opposite corresponded values.
Sihama Issa Salih, Fadhel Abbas Hashem and Auda Jabbar Braihi, 2018. Optimization of Nano Graphite Oxide and Others for Super Absorbent Nano Composites Polymeric Materials. Journal of Engineering and Applied Sciences, 13: 8228-8232.