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Influence of chain length of diol on the swelling behavior of citric acid based pH sensitive polymeric hydrogels: A green approach
Author(s) -
Franklin David S.,
Guhanathan Selvam
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41403
Subject(s) - self healing hydrogels , swelling , differential scanning calorimetry , diol , polymer chemistry , citric acid , chemical engineering , thermogravimetric analysis , chemistry , methacrylic acid , fourier transform infrared spectroscopy , materials science , nuclear chemistry , copolymer , polymer , organic chemistry , composite material , physics , engineering , thermodynamics
Synthesis of pH‐sensitive hydrogels of citric acid with varying diol units viz ., 1,2 Ethane diol, 1,4 butane diol, and 1,6 hexane diol along with methacrylic acid towards the solventless green approach. The formations of the hydrogels were identified using FTIR spectroscopy. Thermal characterization (thermo gravimetric analysis, differential thermal analysis (DTA), and differential scanning calorimetry) and morphology of the synthesized hydrogels have been investigated. Swelling studies of hydrogels in various pH ranging from 4.0 to 10.0 have been investigated. The results of the swelling studies implied that percentage of swelling comparatively higher at neutral pH (7.4) than at acidic and alkaline pH. The inverse relationship was noticed, where ascending the diol units of hydrogel in swelling equilibrium. The hydrogels with the increasing chain length show a noticeable pH sensitivity and which could be considered as smart hydrogel. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41403.