Temperature Effect on the Elasticity of Acrylamide-n-Isopropylacrylamide Copolymers

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Date

2018

Authors

Evingür, Gülşen Akin
Pekcan, Önder

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Taylor & Francis Inc

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Abstract

Acrylamide (AAm) - N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with various weight percentages (wt%) of AAm and NIPA. The temperature dependence of the compressive elastic modulus G and toughness U-TU- of the PAAm- NIPA copolymers due to a volume phase transition was found using a compressive testing technique. It was observed that the compressive elastic modulus increased comprehensively when the temperature was increased between 30 degrees C and 60 degrees C. The PAAm- NIPA copolymers presented higher values of the compressive elastic modulus than pure NIPA above the lower critical solution temperature (LCST) (NIPA exhibits a volume phase transition from hydrophilic to hydrophobic in water at 31 degrees C) and their compressive elastic modulus and toughness had a strong temperature dependence.

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Keywords

Elastic modulus, Toughness, Acrylamide, N-isopropylacrylamide, Copolymer

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3

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N/A

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Q3

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Volume

57

Issue

2

Start Page

168

End Page

175