Volume 4, Issue 2-1, March 2015, Page: 30-36
Viscoelastic and Rheological Properties of Carboxymethyl Cellulose /Starch/Graphite Oxide as Superabsorbent Hydrogel Nano Composites (SHNCs)
Auda Jabbar Braihi, Babylon University, College of Materials Engineering, Polymer and Petrochemical Industries Department, Babylon, Iraq
Sihama Issa Salih, University of Technology, Materials Engineering, Baghdad, Iraq
Fadhel Abbas Hashem, University of Technology, Materials Engineering, Baghdad, Iraq
Received: Nov. 17, 2014;       Accepted: Dec. 4, 2014;       Published: Dec. 27, 2014
DOI: 10.11648/j.ijmsa.s.2015040201.16      View  3562      Downloads  250
Abstract
Uncross-linked carboxymethyl cellulose (CMC) / starch blend used to prepare two hydrogels; the first is cross-linked CMC / starch with aluminum sulfate octadecahydrate cross-linker and the second is SHNCs manufactured from incorporation of 0.3wt% nano graphite oxide (GO) in the above cross-linked blend. Viscoelastic and rheological properties of these two hydrogels were studied and compared with the uncross-linked blend. Results showed that the cross-linking process increases the blend miscibility and converted it to miscible blend. The SHNCs hydrogel has the higher Tg and the uncross-linked blend has the higher Tan δ. GO addition causes increment in some viscoelastic parameters such as G*, G', and G", and decrement in damping parameters and make the damping behavior more stable at lower frequencies, and causes increment for all rheological parameters (η* , ηo, ηf , and GNo). GO addition leads, also, to the absence of the shear thickening behavior and increases both the entanglement density and the molecular weight average. Both hydrogels exhibited broad molecular weight distribution (MWD) and highly cross-linking degree and their elastic behavior predominates; makes them rigid specially at higher frequencies.
Keywords
Viscoelastic Properties, Rheology, Superabsorbent Hydrogel Nanocomposites (SHNCs), Graphite Oxide(GO), Carboxymethyl Cellulose(CMC)
To cite this article
Auda Jabbar Braihi, Sihama Issa Salih, Fadhel Abbas Hashem, Viscoelastic and Rheological Properties of Carboxymethyl Cellulose /Starch/Graphite Oxide as Superabsorbent Hydrogel Nano Composites (SHNCs), International Journal of Materials Science and Applications. Special Issue: Steel and Direct Reduced Iron (sponge Iron) Industry . Vol. 4, No. 2-1, 2015, pp. 30-36. doi: 10.11648/j.ijmsa.s.2015040201.16
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