Effect of polyelectrolyte on the lower critical solution temperature of poly(N-isopropyl acrylamide) in the poly(NIPAAm-co-acrylic acid) hydrogel

Yoo, Mi Kyong; Sung, Yong Kiel; Lee, Young Moo; Cho, C.S.

doi:10.1016/s0032-3861(99)00779-x

Cited by 182 publications

(90 citation statements)

References 20 publications

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“…The pk a of AAc is approximately 4.5. 42 When pH is less than the pk a of AAc, the value of R h is small because carboxyl groups (−COOH) are in protonated state and electrostatic repulsions are absent. When the pH of the medium is around the pK a of AAc, -COOH ionizes and converts into carboxylate ions (-COO − ) .…”

Section: Dls Study Of P(nipam-co-aac) Microgelsmentioning

confidence: 99%

Effect of acrylic acid feed contents of microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels

Farooqi¹,

Khan²,

Begum³

et al. 2015

Turk J Chem

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Abstract:We synthesized poly(N-isopropylacrylamide-co-acrylic acid) microgels with 1, 3, 5, and 7 mol percentage of acrylic acid. Silver nanoparticles were fabricated inside these microgels at room temperature. Pure microgels were characterized by Fourier transform infrared (FTIR) spectroscopy and dynamic light scattering (DLS). Hybrid microgels were characterized by UV-Visible spectroscopy. The size of the silver nanoparticles increased with an increase in the content of acrylic acid. Catalytic activity of these hybrid microgels was investigated using UV-Visible spectrophotometry.Induction time decreased from 8.8 to 2.6 min and the value of apparent rate constant decreased from 0.226 to 0.109 min −1 , when the content of acrylic acid was increased from 1 to 7 mol %. This decrease in induction time was due to decrease in the surface area of nanoparticles present within the microgels with an increase in the feed contents of acrylic acid. The decrease in the value of apparent rate constant was due to an increase in the size of nanoparticles fabricated within the microgels with an increase in mol percentage of acrylic acid. The linear relation between apparent rate constant and feed contents of acrylic acid can be used for quantitative analysis of contents of acrylic acid present in polymer microgels.

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Section: Dls Study Of P(nipam-co-aac) Microgelsmentioning

confidence: 99%

Effect of acrylic acid feed contents of microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels

Farooqi¹,

Khan²,

Begum³

et al. 2015

Turk J Chem

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“…Díez-Peña [54] refleted this bahaviour with PNIPA nanohydrogels copolymerized with methacrylic acid and Yoo et al [220] in hydrogels of PNIPA copolymerized with AA.…”

Section: Simultaneous Temperature and Ph-induced Collapsementioning

confidence: 99%

Smart Nanohydrogels for Controlled Release of Food Preservatives

González

2016

Antimicrobial Food Packaging

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“…N-isopropylacrylamide (NIPAAM) is one of the most studied monomers for the preparation of temperature-responsive polymers [5]. The cloud point of homopolymer of NIPAAM is around 32 °C, and copolymerization of NIPAAM with different anionic [6], cationic [7], and non-ionic [8] monomers can significantly change this value. The other temperature-sensitive polymers, which are not based on NIPAAM, include polymers based on N-vinylcaprolactame, 2-ethyl-2-oxazoline, N,N-diethylacrylamide (DEAM), methylvinylether (MVE), and N-vinylcaprolactam (NVCl) [9].…”

Section: Introductionmentioning

confidence: 99%

New Thermo-Sensitive Hydrogel Based on Copolymer of 2-hydroxyethyl Acrylate and Ethyl Acrylate

Rakhmetullayeva

Azhkeyeva

Yeligbayeva

et al. 2017

Eurasian Chem. Tech. J.

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In this work firstly the thermo-sensitive polymer hydrogels were obtained by three-dimensional radical copolymerization of water-soluble HEA and hydrophobic monomer ethyl acrylate (EA) in the presence of crosslinking agent N,N'-methylenebisacrylamide (BAA). The hydrogels with certain copolymer compositions showed thermo-sensitive behavior in aqueous solutions. The regularity of complex formation of cross-linked copolymer HEA-EA with anionic and cationic surface-active substances have been studied. The swelling behavior of the hydrogels in cetylpyridinium bromide aqueous solutions was studied. Increased swelling of the hydrogels was observed in the surfactant solutions. The increased swelling was more prominent for the hydrogels with a higher content of the hydrophobic moiety in the copolymer composition and with the higher surfactant concentration. The reason for the observed phenomenon is discussed.

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Effect of polyelectrolyte on the lower critical solution temperature of poly(N-isopropyl acrylamide) in the poly(NIPAAm-co-acrylic acid) hydrogel

Cited by 182 publications

References 20 publications

Effect of acrylic acid feed contents of microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels

Effect of acrylic acid feed contents of microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels

Smart Nanohydrogels for Controlled Release of Food Preservatives

New Thermo-Sensitive Hydrogel Based on Copolymer of 2-hydroxyethyl Acrylate and Ethyl Acrylate

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