a discontinuous nonionic polyacrylamide gel in Andorra

a discontinuous nonionic polyacrylamide gel in Andorra
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  • Does nonionic N isopropylacrylamide gel undergo a discontinuous phase transition?
  • Nonionic N ‐isopropylacrylamide gel was found to undergo a discontinuous phase transition by changing a solvent composition or temperature. The observation that polymer gel with and without charge can undergo a first order volume phase transition is an evidence for the universality of the phase transition of polymer gels. 1. ). 2. ). 3. ). 4. ). 5.
  • Why do cross-linked PNIPAm gels undergo a discontinuous phase transition?
  • Cross-linked PNIPAM gels, though nonionic, undergo a discontinuous volume phase transition from a low-temperature swollen state to a high-temperature collapsed state in water approximately 32 °C as the temperature is varied . The molecular origin of this phenomenon remains to be fully understood.
  • Why do cross-linked PNIPAm gels exhibit discontinuous volume changes around LCST?
  • Cross-linked PNIPAM gels also exhibit discontinuous volume changes around the LCST . This phenomenon is called the volume phase transition. Because of their thermosensitivity, aqueous solutions and hydrogels of PNIPAM have been studied extensively for application in various fields .
  • How do Okada and Tanaka apply the theory of associating polymer solutions?
  • Okada and Tanaka applied the theory of associating polymer solutions , which enables us to explicitly describe the molecular association in a thermal equilibrium system, to aqueous PNIPAM solutions based on the concept of cooperative hydration.