The structure characterization of thermosensitive poly(<i>N</i>
-isopropylacrylamide-<i>co</i>
-2-hydroxypropyl methacrylate) hydrogel

Ilić‐Stojanović, Snežana; Nikolić, Ljubiša; Nikolić, Vesna; Ristić, Ivan; Budìnski‐Simendìć, Jaroslava; Kapor, Á.; Nikolić, Goran

doi:10.1002/pi.4589

Cited by 31 publications

(28 citation statements)

References 38 publications

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“…In the XRD difractogram of synthesized p(NIPAM/AA) copolymer, there have been two wide diffraction peaks, secondary at 2θ = 8.39° and fundamental at 2θ = = 19.50°. Wide diffraction peaks do not have clearly defined reflections and show the lower degree of crys-tallinity [41], i.e., p(NIPAM/AA) copolymer possesses semi-crystalline structure. Difractogram of p(NIPAM/AA) copolymer in Figure 2 shows considerable similarity with difractogram of p(NIPAM) homopolymer obtained in the works of other authors [41,42].…”

Section: Resultsmentioning

confidence: 99%

The evaluation of temperature and pH influences on equilibrium swelling of poly(n-isopropylacrylamide-co-acrylic acid) hydrogels

Zdravković¹,

Nikolić²,

Ilić‐Stojanović³

et al. 2017

Hem Ind

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Hydrogels are synthesized by the method of radical polymerization of monomers: N-isopropylacrylamide (NIPAM) and acrylic acid (AA). Characterization of poly(N-isopropylacrylamide-co-acrylic acid) hydrogels, p(NIPAM/AA), has been performed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and by determination of the swelling behaviour in aqueous solutions at different temperatures (25, 31 and 37 °C) and pH values (2.2, 4.5, 6 and 6.8). After lyophilisation in the solution at pH 6 and temperature of 25 °C, p(NIPAM/AA) hydrogels have rapidly reached equilibrium degree of swelling, α e , in comparison to non-lyophilized samples. The mechanism of solvent transport within matrix in lyophilized samples corresponds to less Fickian diffusion, whereas Super case II diffusion is characteristic for non-lyophilized samples. p(NIPAM/AA) hydrogel with 1.5 mol% of ethylene glycol dimethacrylate (EGDM) at the temperature of 25 °C and pH 6.8, has reached the highest swelling equilibrium degree, α e = 259.8. The results of swelling studies have shown that p(NIPAM/AA) hydrogels can be classified as superabsorbent polymers (SAPs). For the evaluation of pH and temperature influences on synthesized hydrogels swelling, a full three-level experimental design has been used. Two-factor interaction model (2FI) is the most optimal model of a full three-level experimental design for representing the swelling equilibrium degree of p(NIPAM/AA) hydrogels as a function of investigated parameters, i.e., temperature and pH.

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Section: Resultsmentioning

confidence: 99%

The evaluation of temperature and pH influences on equilibrium swelling of poly(n-isopropylacrylamide-co-acrylic acid) hydrogels

Zdravković¹,

Nikolić²,

Ilić‐Stojanović³

et al. 2017

Hem Ind

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“…Hydrogels are 3D cross linked polymer networks which have water retention behavior due to the presence of numerous hydrophilic functional groups in their structure [1][2][3]. These polymeric systems have various applications in the fields of agriculture and horticulture [4][5][6], wound dressings [7,8], hygienic and cosmetic materials [9][10][11], water treatment [12] and medicine [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Polymer/zeolite nano-composite hydrogels as promising water reservoir materials: effect of clinoptilolite content on physicochemical properties

2019

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In this work, with the aim of improving the water uptake behavior and mechanical properties, a novel nano-composite hydrogel system was synthesized using clinoptilolite as a semi-layered zeolite. Accordingly, the gelatin/SCMC-g-poly (AA-co-AAm)/clinoptilolite semi-IPN nano-composite hydrogel samples were synthesized and studied. The FTIR, XRD, SEM and EDX analysis were accomplished to confirm the successful synthesis of the nano-composite hydrogel samples. Additionally, to investigate the effect of clinoptilolite content on water uptake properties and gel characteristics of the synthesized nano-composite hydrogel samples, water absorption kinetics studies and rheological evaluations were carried out. It is obtained that, there is an optimum amount for additive content which can improve the hydrogel properties. Results showed that nano-composite hydrogel sample with 5% W/W of clinoptilolite with respect to the gelatin amount has the best efficiency from the point of view of the water absorption properties and gel characteristics. This phenomenon is related to the creation of physical cross linking in the hydrogels' structure which leads to the creation of porous hydrogels.

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“…The structural formula of the used monomers N-isopropilcrylamide and 2-hydroxypropyl methacrylate and the potential structure of the synthesized copolymer were presented in Figure 1. This work presents a continuation of the extensive investigation of "intelligent" gels based on NIPAM [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

The effect of the cross-linker content on the swelling properties of intelligent gels

Ilić‐Stojanović¹,

Nikolic²,

Nikolić³

et al. 2014

Savr tehnol

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This paper presents the procedure for the synthesis of hydrogels based on Nisopropylacrylamide (NIPAM) and 2-hydroxypropyl methacrylate (HPMet) using dioxan as a solvent. Hydrogels were obtained by radical polymerization using different contents of ethylene glycol dimethacrylate as a cross-linker and benzoyl peroxide as the initiator. In the FTIR spectra of poly(N-isopropylacrylamide-co-2-hydroxypropylmethacrylate) (p(NIPAM-HPMet)) xerogel, new absorption bands are present and there are no specific bands characteristic of a monomer NIPAM, which indicates that copolymerization was performed. SEM micrographs show porous surfaces of xerogels. The aim of this work was the investigation of the swelling behavior for all synthesized hydrogels with different cross-linker content at the temperature from 20 to 40 °C. The sample of p(NIPAM-HPMet) with the lowest cross-linker content reached the highest swelling degree at 20 °C (α=20.23). The degree of swelling decreased with increasing the cross-linker content and temperature, so the samples with highest cross-linker content at 40 °C reached the swelling degree of 2.05.

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The structure characterization of thermosensitive poly(N -isopropylacrylamide-co -2-hydroxypropyl methacrylate) hydrogel

Cited by 31 publications

References 38 publications

The evaluation of temperature and pH influences on equilibrium swelling of poly(n-isopropylacrylamide-co-acrylic acid) hydrogels

The evaluation of temperature and pH influences on equilibrium swelling of poly(n-isopropylacrylamide-co-acrylic acid) hydrogels

Polymer/zeolite nano-composite hydrogels as promising water reservoir materials: effect of clinoptilolite content on physicochemical properties

The effect of the cross-linker content on the swelling properties of intelligent gels

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