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The Scientific World Journal
Volume 2014, Article ID 516076, 8 pages
Research Article

Phase Diagrams of Smart Copolymers Poly(N-isopropylacrylamide) and Poly(sodium acrylate)

1Department of Chemistry, Rzeszow University of Technology, 35-959 Rzeszow, Poland
2Consiglio Nazionale delle Ricerche, Istituto di Chimica e Tecnologia dei Polimeri, c/o Compresorio Olivetti, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
3ATHAS-MP Company, Knoxville, TN 37922, USA

Received 25 January 2014; Revised 17 July 2014; Accepted 17 July 2014; Published 14 August 2014

Academic Editor: Franck Cleymand

Copyright © 2014 Iwona Zarzyka et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The phase behavior of linear poly(N-isopropylacrylamide) (PNIPA), linear copolymer poly(N-isopropylacrylamide) and poly(sodium acrylate) (PNIPA-SA), and chemically cross-linked PNIPA in water has been determined by temperature modulated differential scanning calorimetry (TM-DSC). Experiments related to linear polymers (PNIPA and PNIPA-SA) indicated nontypical demixing/mixing behavior with a lower critical solution temperature (LCST), which do not correspond to the three classical types of limiting critical behavior. Some similarities and differences are observed in comparison to our literature data using standard TM-DSC for PNIPA/water. Furthermore no influence of composition cross-linked PNIPA/water system on demixing/mixing temperature was observed.