Preparation of CMC-poly(N-isopropylacrylamide) semi-interpenetrating hydrogel with temperature-sensitivity for water retention.
Int J Biol Macromol
; 268(Pt 2): 131735, 2024 May.
Article
em En
| MEDLINE
| ID: mdl-38653424
ABSTRACT
The CMC-PNIPAM hydrogel with semi-interpenetrating structure and temperature-sensitivity was prepared by in-situ polymerization of N-isopropylacrylamide (NIPAM) in sodium carboxymethylcellulose (CMC) solution at room temperature. The mass ratio of CMC to NIPAM was a key factor influencing the network structure and property of CMC-PNIPAM hydrogel. The low critical phase transition temperature (LCST) of CMC-PNIPAM hydrogels increased from 34.4⯰C to 35.8⯰C with the mass ratio of CMC to NIPAM rising from 0 to 1.2. The maximum compressive stress of CMC-PNIPAM hydrogel reached to 26.7â¯kPa and the relaxation elasticity was 52â¯% at strain of 60â¯%. The viscoelasticity of CMC-PNIPAM hydrogel was consistent with the generalized Maxwell model. The maximum swelling ratio in deionized water was 170.25â¯g·g-1 (dried hydrogel) with swelling rate of 2.57â¯g·g-1·min-1 at 25⯰C. CMC-PNIPAM hydrogel hardly absorbed water above LCST, but the swollen hydrogel could release water at the rate of 0.36â¯g·g-1·min-1 once exceeding LCST. The test of water retention showed that soil mixed with 2â¯wt% dried CMC-PNIPAM hydrogel could retain 13.08â¯wt% water after 30â¯days at 25⯰C that was 4.4 times than that of controlled soil without CMC-PNIPAM hydrogel. The semi-interpenetrating CMC-PNIPAM hydrogel showed a potential to conserve water responding to temperature.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Temperatura
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Resinas Acrílicas
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Carboximetilcelulose Sódica
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Água
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Hidrogéis
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article