High strength thermoresponsive semi-IPN hydrogels reinforced with nanoclays
Abstract
Two series of nanoclay reinforced, thermoresponsive hydrogels were prepared, one based on poly(N-isopropylacrylamide) (PNIPA) and the other on semi-interpenetrating networks containing PNIPA and poly(N-vinyl pyrrolidone) (PVP), designated as SIPNs. The gels were crosslinked with 1, 3, and 5 wt % inorganic clay (hectorite) and SIPN gels additionally contained 1 wt % of PVP. The hydrogels were tested in the "as-prepared state," i.e., at 10 wt % PNIPA concentration in water and at equilibrium (maximum) swelling. Increasing the concentration of nanoclays increases crosslink density, modulus, tensile strength, elongation (except in equilibrium swollen gels), hysteresis and with decreases in the degree of swelling, broadening of the phase transition region, and a decrease in elastic recovery at high deformations. The presence of linear PVP in the networks increases porosity and the pore size, increases swelling, deswelling rates, and hysteresis, but decreases slightly lower critical solution... temperature (LCST), tensile strength, elongation, and elastic recovery. The strongest hydrogels were ones with 10 wt % PNIPA and 5 wt % of nanoclays, displaying tensile strengths of 85 kPa and elongation of 955%. All properties of hydrogels at the equilibrium swollen state are lower than in the as-prepared state, due to the lower concentration of chains per unit volume, but the trends are preserved.
Keywords:
mechanical properties / nanocomposite / semi-interpenetrating networks (semi-IPNs) / swelling/deswelling kinetics / thermosensitive hydrogelsSource:
Journal of Applied Polymer Science, 2012, 124, 4, 3024-3036Publisher:
- Wiley Periodicals, Inc.
Funding / projects:
- Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)
DOI: 10.1002/app.35334
ISSN: 0021-8995
WoS: 000299947100041
Scopus: 2-s2.0-84856760508
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Đonlagić, Jasna AU - Žugić, Dragana AU - Petrović, Zoran PY - 2012 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5689 AB - Two series of nanoclay reinforced, thermoresponsive hydrogels were prepared, one based on poly(N-isopropylacrylamide) (PNIPA) and the other on semi-interpenetrating networks containing PNIPA and poly(N-vinyl pyrrolidone) (PVP), designated as SIPNs. The gels were crosslinked with 1, 3, and 5 wt % inorganic clay (hectorite) and SIPN gels additionally contained 1 wt % of PVP. The hydrogels were tested in the "as-prepared state," i.e., at 10 wt % PNIPA concentration in water and at equilibrium (maximum) swelling. Increasing the concentration of nanoclays increases crosslink density, modulus, tensile strength, elongation (except in equilibrium swollen gels), hysteresis and with decreases in the degree of swelling, broadening of the phase transition region, and a decrease in elastic recovery at high deformations. The presence of linear PVP in the networks increases porosity and the pore size, increases swelling, deswelling rates, and hysteresis, but decreases slightly lower critical solution temperature (LCST), tensile strength, elongation, and elastic recovery. The strongest hydrogels were ones with 10 wt % PNIPA and 5 wt % of nanoclays, displaying tensile strengths of 85 kPa and elongation of 955%. All properties of hydrogels at the equilibrium swollen state are lower than in the as-prepared state, due to the lower concentration of chains per unit volume, but the trends are preserved. PB - Wiley Periodicals, Inc. T2 - Journal of Applied Polymer Science T1 - High strength thermoresponsive semi-IPN hydrogels reinforced with nanoclays EP - 3036 IS - 4 SP - 3024 VL - 124 DO - 10.1002/app.35334 ER -
@article{ author = "Đonlagić, Jasna and Žugić, Dragana and Petrović, Zoran", year = "2012", abstract = "Two series of nanoclay reinforced, thermoresponsive hydrogels were prepared, one based on poly(N-isopropylacrylamide) (PNIPA) and the other on semi-interpenetrating networks containing PNIPA and poly(N-vinyl pyrrolidone) (PVP), designated as SIPNs. The gels were crosslinked with 1, 3, and 5 wt % inorganic clay (hectorite) and SIPN gels additionally contained 1 wt % of PVP. The hydrogels were tested in the "as-prepared state," i.e., at 10 wt % PNIPA concentration in water and at equilibrium (maximum) swelling. Increasing the concentration of nanoclays increases crosslink density, modulus, tensile strength, elongation (except in equilibrium swollen gels), hysteresis and with decreases in the degree of swelling, broadening of the phase transition region, and a decrease in elastic recovery at high deformations. The presence of linear PVP in the networks increases porosity and the pore size, increases swelling, deswelling rates, and hysteresis, but decreases slightly lower critical solution temperature (LCST), tensile strength, elongation, and elastic recovery. The strongest hydrogels were ones with 10 wt % PNIPA and 5 wt % of nanoclays, displaying tensile strengths of 85 kPa and elongation of 955%. All properties of hydrogels at the equilibrium swollen state are lower than in the as-prepared state, due to the lower concentration of chains per unit volume, but the trends are preserved.", publisher = "Wiley Periodicals, Inc.", journal = "Journal of Applied Polymer Science", title = "High strength thermoresponsive semi-IPN hydrogels reinforced with nanoclays", pages = "3036-3024", number = "4", volume = "124", doi = "10.1002/app.35334" }
Đonlagić, J., Žugić, D.,& Petrović, Z.. (2012). High strength thermoresponsive semi-IPN hydrogels reinforced with nanoclays. in Journal of Applied Polymer Science Wiley Periodicals, Inc.., 124(4), 3024-3036. https://doi.org/10.1002/app.35334
Đonlagić J, Žugić D, Petrović Z. High strength thermoresponsive semi-IPN hydrogels reinforced with nanoclays. in Journal of Applied Polymer Science. 2012;124(4):3024-3036. doi:10.1002/app.35334 .
Đonlagić, Jasna, Žugić, Dragana, Petrović, Zoran, "High strength thermoresponsive semi-IPN hydrogels reinforced with nanoclays" in Journal of Applied Polymer Science, 124, no. 4 (2012):3024-3036, https://doi.org/10.1002/app.35334 . .