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Polymer hydrogels of 2-hydroxyethyl acrylate and acrylic acid obtained by frontal polymerization

Sanna, Roberta and Alzari, Valeria and Nuvoli, Daniele and Scognamillo, Sergio and Marceddu, Salvatore and Mariani, Alberto (2012) Polymer hydrogels of 2-hydroxyethyl acrylate and acrylic acid obtained by frontal polymerization. Journal of Polymer Science. Part A: Polymer Chemistry, Vol. 50 (8), p. 1515-1520. eISSN 1099-0518. Article.

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DOI: 10.1002/pola.25913


In this work, we report on the synthesis and characterization of homopolymers and copolymers of acrylic acid and 2-hydroxyethyl acrylate prepared by the use of the frontal polymerization (FP) technique. Tetraethyleneglycoldiacrylate was used as a crosslinker and benzoyl peroxide as an initiator. The maximum temperatures reached by the front were in the range between 214 C and 296 C. Besides, front velocities ranged between 3.9 and 10.8 cm/min, the latter being one of the highest values reported so far in the FP literature. Differential scanning calorimetry was used to estimate the conversion degree, which was always comprised between 90% and 96%, and to determine the glass transition temperatures, which were found to be dependent on the composition, with values ranging from 13 C to 168 C. Moreover, the obtained materials were allowed to swell in aqueous solutions at various pH. The samples exhibit a moderate increase of the swelling ratio percentage (SR%) at pH ≈ 5–6, and a sudden and larger SR% increase at pH ≈ 12–13 depending on the composition, thus indicating the obtainment of pH-responsive polymer hydrogels.

Item Type:Article
ID Code:7554
Uncontrolled Keywords:Acrylic polymers, frontal polymerization, hydrogels, radical polymerization, stimuli-sensitive polymers
Subjects:Area 03 - Scienze chimiche > CHIM/04 Chimica industriale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Blackwell / Wiley
Deposited On:10 May 2012 17:46

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