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Photopolymerization as Alternative Concept for Synthesis of Poly( N ‐isopropylacrylamide)‐Clay Nanocomposite Hydrogels
Author(s) -
Ferse Bernhard,
Graf Matthias,
Krahl Franziska,
Arndt KarlFriedrich
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000125
Subject(s) - photopolymer , poly(n isopropylacrylamide) , materials science , self healing hydrogels , nanocomposite , rheology , swelling , dispersion (optics) , chemical engineering , aqueous solution , adsorption , ultimate tensile strength , polymer chemistry , composite material , polymer , polymerization , copolymer , chemistry , optics , organic chemistry , physics , engineering
In this work the photopolymerization of N ‐isopropylacrylamide is described as an alternative method to synthesize thermosensitive NC‐gels. Tensile measurements show elongations at break up to 1000%. The mechanical properties of photopolymerized NC‐gels strongly depend on the conditions during the preparation, e.g. intensity of radiation, wavelength, irradiation time. The characterization by microscopic methods (AFM, SEM, TEM) and rheology shows as a result a physical adsorption of polymerchains on the clay surface. Consequently, for the first time mechanical stable, homogeneous thermosensitive NC‐gels could be obtained by mixing poly( N ‐isopropylacrylamide) solutions with an aqueous clay dispersion.