caa a22 4500 605466335 CHVBK 20210128100306.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00397-015-0837-z doi (NATIONALLICENCE)springer-10.1007/s00397-015-0837-z Self-associations and temperature dependence of aqueous solutions of zwitterionically modified N-isopropylacrylamide copolymers [Elektronische Daten] [Saud Hashmi, Mohammad Vatankhah-Varnoosfaderani, Amin GhavamiNejad, Francis Obiweluozor, Bing Du, Florian Stadler] Thermosensitive copolymer solutions are prepared from various molar ratios of N-isopropylacrylamide (NIPAM) and the zwitterionic monomer N-(methacryloxypropyl)-N,N-dimethyl-N-(3-sulfopropyl) ammonium betaine (Zw) by free radical polymerization. In the current study, we examined the rheological properties of poly (NIPAM/sulfobetaine) copolymer solutions. We found that the rheological properties are conceptually linked with the copolymer chemical structure and chain topology. We also report the effects of bulk molar mass and zwitterions on flow curve ɳ ( γ ⋅ $$ \overset{\cdot }{\upgamma} $$ ). With the introduction of the charged group in the PNIPAM-chain, its viscoelastic phase behavior and lower critical solution temperature (LCST) are affected. At varying concentrations of zwitterionic copolymer, they showed a shear thinning behavior with two relaxation regimes for entanglement relaxation and zwitterionic interaction. Interestingly, the zwitterionic interactions are related to the molar concentration of zwitterionic monomer. This is eventually associated with the topology of the copolymer chain. Our results also showed that there was a linear increase in the LCST of these solutions as a function of zwitterionic moieties. Springer-Verlag Berlin Heidelberg, 2015 Self-association nationallicence Zwitterion nationallicence Upper and lower critical solution temperature nationallicence Double relaxation (entanglements ionic interactions) nationallicence Polymer solution nationallicence Hashmi Saud College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut Vatankhah-Varnoosfaderani Mohammad Department of Polymer, Omidiyeh Branch, Islamic Azad University, 63731-93719, Omidiyeh, Iran aut GhavamiNejad Amin College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut Obiweluozor Francis School of Semiconductor and Chemical Engineering, Chonbuk National University, Baekjero 567, Deokjin-gu, 561-756, Jeonju, Jeonbuk, Republic of Korea aut Du Bing College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut Stadler Florian College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut Rheologica Acta Springer Berlin Heidelberg 54/6(2015-06-01), 501-516 0035-4511 54:6<501 2015 54 397 https://doi.org/10.1007/s00397-015-0837-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0837-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hashmi Saud College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut NATIONALLICENCE 700 1- Vatankhah-Varnoosfaderani Mohammad Department of Polymer, Omidiyeh Branch, Islamic Azad University, 63731-93719, Omidiyeh, Iran aut NATIONALLICENCE 700 1- GhavamiNejad Amin College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut NATIONALLICENCE 700 1- Obiweluozor Francis School of Semiconductor and Chemical Engineering, Chonbuk National University, Baekjero 567, Deokjin-gu, 561-756, Jeonju, Jeonbuk, Republic of Korea aut NATIONALLICENCE 700 1- Du Bing College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut NATIONALLICENCE 700 1- Stadler Florian College of Materials Science and Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/6(2015-06-01), 501-516 0035-4511 54:6<501 2015 54 397