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

Naozumi Wada; Yasuhiko Yagi; Hiroshi Inornate; Shozaburo Saito

doi:10.1021/ma00052a024

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

Naozumi Wada, Yasuhiko Yagi, Hiroshi Inornate, Shozaburo Saito

ENG - Research Center of Supercritical Fluid Technology

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	7220-7222
Number of pages	3
Journal	Macromolecules
Volume	25
Issue number	26
DOIs	https://doi.org/10.1021/ma00052a024
Publication status	Published - 1992 Dec 1

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Thermosensitive Reentrant Swelling Behavior of N-(Alkoxyalkyl)acrylamide Gels in Water",

abstract = "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.",

author = "Naozumi Wada and Yasuhiko Yagi and Hiroshi Inornate and Shozaburo Saito",

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AU - Wada, Naozumi

AU - Yagi, Yasuhiko

AU - Inornate, Hiroshi

AU - Saito, Shozaburo

PY - 1992/12/1

Y1 - 1992/12/1

N2 - 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.

AB - 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.

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

Abstract

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