https://doi.org/10.1051/epjap/2014140328
Universality of elasticity on PAAM-NIPA copolymer gels
1
Faculty of Science and Letters, Piri Reis University, 34940
Tuzla, Istanbul, Turkey
2
Faculty of Engineering and Natural Sciences, Kadir Has University, 34083
Cibali, Istanbul, Turkey
a e-mail: gulsen.evingur@pirireis.edu.tr
Received:
13
August
2014
Revised:
10
November
2014
Accepted:
27
November
2014
Published online:
7
January
2015
Polyacrylamide (PAAm)-N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with different molar of NIPA varying in the range between 0 and 2 M. The mechanical properties of swollen PAAm-NIPA copolymers were characterized by the compressive testing technique. It is understood that the compressive elastic modulus was found to increase by increasing NIPA contents, keeping temperature constant at 30 °C. The critical exponent of elasticity, y above the critical NIPA concentration is found to be as 0.74, which is consistent with the suggestions of percolation for superelastic percolation network (SEPN) and the critical theory for PAAm-NIPA copolymers.
© EDP Sciences, 2015
