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Preparation and Characterization of Organic‐Inorganic Composite Materials Based on Poly(acrylamide) Hydrogels and Clay Minerals
Author(s) -
Ibraeva Zhanar E.,
Zhumaly Assiya A.,
Blagih Evgeniy,
Kudaibergenov Sarkyt E.
Publication year - 2015
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.201300131
Subject(s) - montmorillonite , swelling , bentonite , swelling capacity , materials science , clay minerals , self healing hydrogels , composite number , kaolinite , chemical engineering , fourier transform infrared spectroscopy , composite material , chemistry , polymer chemistry , mineralogy , metallurgy , engineering
Summary Organic‐inorganic hybrid composite materials consisting of poly(acrylamide) hydrogel (PAAH) and clay minerals such as bentonite, montmorillonite, and kaolin as well as silica and titanium dioxides were obtained by “ in situ ” synthetic protocol and characterized by swelling measurements, FTIR, SEM, XRD and DSC. Concentration of clay minerals embedded within PAAH is varied from 2.5 to 30 wt.%. The swelling degree of composite hydrogels K s and the constants k and n that characterize the mode of the penetrant (e.g. water) transport mechanism were determined. It was found that the swelling degree of PAAH/Clay minerals is in the range of 7‐15 g/g and changes in the following order: PAAH/Bentonite>PAAH/TiO 2 >PAAH/SiO 2 >PAAH/Kaolin≈ PAAH/Montmorillonite. The influence of pH, temperature, ionic strength, water‐organic solvent mixture, as well as the content of clay minerals and crosslinking agent on swelling‐deswelling behaviour of composite hydrogel materials was evaluated. For some PAAH/Clay minerals system the enthalpy of mixing ΔH m was calculated. The positive values of the ΔH m indicate that the swelling of composite hydrogel materials in water has the endothermic character. It was demonstrated that PAAH‐clay mineral composites can potentially be used as “pigs” for the cleaning of the internal surface of main pipes from debris, sand and asphaltene‐resin‐wax deposits.