Effect of cross-Linker types on properties of cross-linked poly (acrylic acid) as the superabsorbent
Volume Title: 1
1polymer department,College of Engineering,university of Tehran,Iran
2Caspian Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 43841-119, Guilan, Rezvanshar, Iran
The monomer of acrylic acid (AA) was polymerized in presence of two crosslinking agent. Polymerization was performed in aqueous xanthan solution. N, N′-hexane-1, 6-dilbisprop-2-enamide (MS) or 1,4-butandioldimethacrylate (BDOD) was used as the cross-linking agent in various ratio of MS/BDOD (100/0, 75/25, 50/50, 25/75, and 0/100). Polymerization was performed in an aqueous xanthan solution (1% wt). Prepared crosslinker and semi-interpenetrating polymer networks (semi-IPNs) evaluated by Fourier transform infrared (FT-IR), proton nuclear magnetic resonance spectroscopy (1H NMR), X-ray diffraction (XRD) and thermogravimetric (TGA) analyses. The results of TGA showed that the thermal resistance of hydrogels increased with increasing BDOD to MS ratio in content of crosslinker. In addition, the results of the swelling test showed that with increasing MS content in the cross-linker, the swelling rate increased in various pH of environment. But the swelling ratio is higher in alkaline environments to other pHs for all samples. The behavioral differences in all tests can be due to the urethane groups in the cross-linker structure. The resulting hydrogels can be used in tissue engineering, dye and effluent absorption, drug delivery and synthetic cartilage.
Poly (acrylic acid) (PAA); Xanthan gum (XG); superabsorbent; Semi-interpenetrating polymer network (semi-IPN); Hydrogel