Swelling Behavior of Multiresponsive Poly(methacrylic acid)-block--poly(N-isopropylacrylamide) Brushes Synthesized Using Surface-Initiated Photoiniferter-Mediated Photopolymerization

2008 ◽  
Vol 18 (8) ◽  
pp. 1232-1240 ◽  
Author(s):  
Santosh B. Rahane ◽  
J. Alaina Floyd ◽  
Andrew T. Metters ◽  
S. Michael Kilbey
Keyword(s):  
Methacrylic Acid ◽  
Swelling Behavior

In air synthesis of GA-cl-poly(MAA) hydrogel and study of its salt- resistant swelling behavior in different salts

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
B. S. Kaith ◽  
Shabnam Ranjta ◽  
Kiran Kumar
Keyword(s):  
Free Radical ◽  
Reaction Time ◽  
Methacrylic Acid ◽  
Salt Concentration ◽  
Gum Arabic ◽  
Swelling Behavior ◽  
Temperature Reaction ◽  
Reaction Parameters ◽  
Potassium Persulphate ◽  
Cross Linker

AbstractA novel hydrogel has been synthesized by grafting methacrylic acid (MAA) onto Gum arabic (GA) through free radical graft co-polymerization in the presence of potassium persulphate (KPS) as an initiator and hexamethylene tetramine (HMTA) as a cross-linker. Various reaction parameters like reaction temperature, reaction time, concentration of initiator, amount of solvent, pH, concentration of monomer and concentration of cross-linker were optimized. GAcl-poly(MAA) was characterized by FTIR spectroscopy, SEM and TGA-DTA techniques. Optimized polymer was studied for its salt-resistant swelling behavior in different solutions: NaCl, MgCl2, CaCl2, FeCl3, ZnCl2 and BaCl2 as a function of salt concentration, temperature and pH. It was observed that GA-cl-poly(MAA) exhibits following salt-resistant swelling trend in different salts: NaCl > ZnCl2 > MgCl2 > CaCl2 > BaCl2 > FeCl3

Poly(Methacrylic Acid-g-Ethylene Glycol) Hydrogels as pH Responsive Biomedical Materials

1993 ◽  
Vol 331 ◽  
Author(s):  
Cristi L. Bell ◽  
Nicholas A. Peppas
Keyword(s):  
Hydrogen Bonding ◽  
Ethylene Glycol ◽  
Methacrylic Acid ◽  
Swelling Behavior ◽  
Ph Responsive ◽  
Responsive Membranes ◽  
Swelling Studies ◽  
Environmentally Sensitive ◽  
Responsive Hydrogels ◽  
Complexation Equilibrium

AbstractNovel graft copolymeric, pH responsive hydrogels have been synthesized by solution polymerization. Poly(methacrylic acid-g-ethylene glycol) hydrogels exhibit reversible complexation as a function of pH because of hydrogen bonding between the PEG grafts and the PMAA main chains. These gels are being developed as pH responsive membranes for use in biomedical applications. ATR-FTIR results indicate that there is hydrogen bonding occurring in membranes swollen under conditions favorable for complexation. Equilibrium swelling studies have shown that the pH of the surrounding environment has a significant effect on the swelling behavior of these membranes. The swelling behavior has also been shown to respond rapidly to changing pH conditions. P(MAA-g-EG) membranes also show pH sensitive permeability toward solutes as a result of this environmentally sensitive swelling.

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