Temperature Effect on the Elasticity of Acrylamide-n-Isopropylacrylamide Copolymers. Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Evingür, Gülşen Akin; Pekcan, Önder
• Is Part Of: Journal of macromolecular science. Volume 57:Issue 2(2018)
• Page Start: 168
• Page End: 175
• Publication Date: 2018-02-01
• Subjects: Elastic modulus -- Toughness -- Acrylamide -- N-isopropylacrylamide -- copolymer; Polymerization -- Periodicals; Polymers -- Periodicals; 530.413
• DOI: 10.1080/00222348.2018.1436339
• Languages: English
• ISSNs: 0022-2348

Abstract

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, UT, 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°C and 60°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°C) and their compressive elastic modulus and toughness had a strong temperature dependence.