Thermosensitive Reentrant Swelling Behavior of N-(Alkoxyalkyl)acrylamide Gels in Water

Naozumi Wada, Yasuhiko Yagi, Hiroshi Inornate, Shozaburo Saito

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The swelling equilibria of four different N-(alkoxyalkyl) acrylamide gels in water were measured at various temperatures. The N-3-(methoxypropyl)acrylamide (NMPA) gel hardly changed its volume upon heating. Three gels (N-(2-ethoxyethyl)acrylamide (NEEA), N-(3-ethoxypropyl)acrylamide (NEPA), and N-(tetrahydrofurfuryl)acrylamide (NTFA) gels) exhibited reentrant type swelling curves of a swollen-shrunkenswollen cycle in water in response to a change in temperature. The gradual shrinking of the NEEA,NEPA,and NTFA gels upon heating within the temperature range 25-35 °C was considered to be due to the weak hydrophobic interaction based on the alkoxyalkyl groups, while the subsequent swelling at higher temperatures was due to the thermal mixing which dominated the hydrophobic interaction. These discussions were supported by preliminary calculations introducing the temperature dependence of hydrophobic interaction into the ΔF term of Tanaka's equation.

Original languageEnglish
Pages (from-to)7220-7222
Number of pages3
Issue number26
Publication statusPublished - 1992 Dec 1

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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