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Thermoresponsive super water absorbent hydrogels prepared by frontal polymerization of N-isopropyl acrylamide and 3-sulfopropyl acrylate potassium salt

Scognamillo, Sergio and Alzari, Valeria and Nuvoli, Daniele and Illescas Martínez, Francisco Javier and Marceddu, Salvatore and Mariani, Alberto (2011) Thermoresponsive super water absorbent hydrogels prepared by frontal polymerization of N-isopropyl acrylamide and 3-sulfopropyl acrylate potassium salt. Journal of Polymer Science. Part A: Polymer Chemistry, Vol. 49 (5), p. 1228-1234. eISSN 1099-0518. Article.

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DOI: 10.1002/pola.24542

Abstract

Super water absorbent polymer hydrogels were synthesized by frontal polymerization. These materials were obtained by copolymerizing N-isopropyl acrylamide (NIPAAm) and 3-sulfopropyl acrylate potassium salt (SPAK) in the presence of N,N′-methylene-bis-acrylamide as a crosslinker. It was found that their swelling behavior in water can be easily tuned by using either the appropriate monomer ratio or the amount of the crosslinker used. Namely, the swelling ratio was found to range from about 1000% for the NIPAAm homopolymer in the presence of 5.0 mol % of crosslinker, up to 35,000% for the sample containing 87.5 mol % of SPAK and 1.0 mol % of crosslinker. The affinity toward water was also confirmed by contact angle analysis. Moreover, the obtained hydrogels exhibit a thermoresponsive behavior, with a lower critical solution temperature of about 28–30 °C. This value is close to that of poly(NIPAAm) but with a swelling capability that dramatically increases as the amount of SPAK increases.

Item Type:Article
ID Code:5454
Status:Published
Refereed:Yes
Uncontrolled Keywords:Frontal polymerization, hydrogels, radical polymerization, swelling, thermoresponsive super water absorbent hydrogels
Subjects:Area 03 - Scienze chimiche > CHIM/04 Chimica industriale
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di scienze delle produzioni alimentari, Sassari
001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Blackwell / Wiley
eISSN:1099-0518
Copyright Holders:© 2011 Wiley Periodicals, Inc.
Deposited On:08 Feb 2011 13:00

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