Carboxymethyl Cellulose/ Poly (Acrylamide-co-Vinyl Imidazole) Based Self-healing and pH-sensitive Hydrogel: Synthesis, Characterization and Functional Insights (Part-I) | Chapter 9 | Chemical and Materials Sciences: Research Findings Vol. 6

 

In recent years, hydrogels with self-healing properties have attracted significant attention from material scientists, likely due to their wide range of applications across diverse fields. These include wearable and flexible devices, electronic skin, biomedicine, tissue engineering, cell therapy, wound dressing, and more. This chapter describes the synthesis, characterisation, and self-healing properties of a hydrogel, composed of poly (acrylamide –co- vinyl-imidazole) and carboxymethyl, designated as ‘Solid Hydrogel Electrolyte’ (SHE). The SHE was prepared by carrying out free radical polymerisation of monomers AAm and VI in the presence of dissolved CMC in an aqueous medium using KPS as a thermal initiator. The SHE was characterised by FTIR, XRD, SEM and TGA analysis. The absorption bands at 1497 and 1544 cm-1 were obtained due to N–C and C–C stretching vibration of the VI chain. The bands at 760 and 660 cm-1 showed C–H ring bending vibration and C–N vibration of azole ring, respectively. The band at 1060 cm-1 was due to CH-O-CH2 stretching of CMC. The surface texture, as revealed by SEM analysis, was observed to be smooth. The XRD pattern contains a sharp peak at 20.43 degrees, attributed to the crystallinity of the polymer owing to the presence of galactose units that form a crystalline region due to the H-bonded arrangement of these units. In addition, a small shoulder between 35o and 45o suggests the amorphous nature of CMC also. The kinetic water uptake study, carried out in the medium of pH 1.0, 6.8 and 7.4, was best interpreted by the ‘Power function model’ which revealed the ‘swelling exponent’ (n) in the range of 0.5 to 0,.7, thus indicating a chain relaxation controlled swelling mechanism. The hydrogel electrolyte exhibited pH-dependent swelling behaviour with per cent equilibrium swelling (PES) of 5170, 1892 and 5163 in the swelling media of pH 1.0, 5.6 and 13.0, respectively. The SHE showed the self-healing property, which was confirmed by the “LED glowing” experiment. As compared to its original elongation of 200 %, the self-healed hydrogel exhibited an elongation of 157 %, thus showing restoration tendency.

 

 

Author(s) Details

Deepika Dubey
Polymer Research Laboratory, Department of Chemistry, Govt. Model Science College, Jabalpur (M.P.)-482001, India.

 

S. K. Bajpai
Polymer Research Laboratory, Department of Chemistry, Govt. Model Science College, Jabalpur (M.P.)-482001, India.

 

M. Bajpai
Polymer Research Laboratory, Department of Chemistry, Govt. Model Science College, Jabalpur (M.P.)-482001, India.

 

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