Preparation and characterization of pH‐sensitive, interpenetrating networks of poly(vinyl alcohol) and poly(acrylic acid)

Gudeman, Linda F.; Peppas, Nikolaos A.

doi:10.1002/app.1995.070550610

Cited by 181 publications

(124 citation statements)

References 15 publications

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“…Although the response rate of the CS/SF semi-IPN was relatively slower than those fastresponding pH-sensitive polymers, it was faster than some other pH-sensitive materials. 8,11,16,17 In addition, the relative slow response rate would be of benefit to some applications of the CS/SF semi-IPN, for instance, in the controlled-release system. SF semi-IPN swelled more significantly in the trivalent ion (especially Al 3/ ) solution than in the hydrogen bonds between CS and SF were broken monovalent and bivalent ion solutions.…”

Section: Ftir Spectrum Of Chitosan/silk Fibroin Semi-ipn Preparation mentioning

confidence: 99%

pH sensitivity and ion sensitivity of hydrogels based on complex-forming chitosan/silk fibroin interpenetrating polymer network

Chen

Zhong

et al. 1997

J. Appl. Polym. Sci.

105

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A novel natural polymer blend, namely, a semi-interpenetrating polymer network (semi-IPN) composed of crosslinked chitosan with glutaraldehyde and silk fibroin was prepared. The FTIR spectra of the semi-IPN manifested that the chitosan and silk fibroin had a strong hydrogen-bond interaction and formed an interpolymer complex. The semi-IPN showed good pH sensitivity and ion sensitivity. According to the different swelling ratios of the semi-IPN in the buffer solution with different pH values or the AlCl 3 aqueous solution with different concentrations, the semi-IPN could swell and shrink while being put alternately into different pH buffer solutions or AlCl 3 aqueous with different concentrations. The semi-IPN could also act as an ''artificial muscle'' because its swelling-shrinking behavior exhibited a fine reversibility.

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Section: Ftir Spectrum Of Chitosan/silk Fibroin Semi-ipn Preparation mentioning

confidence: 99%

pH sensitivity and ion sensitivity of hydrogels based on complex-forming chitosan/silk fibroin interpenetrating polymer network

Chen

Zhong

et al. 1997

J. Appl. Polym. Sci.

105

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“…IPHs are an important class of materials attracting broad interest from both fundamental and applications points of view. 9,10 Gudeman and Peppas 11,12 reported on the pH-sensitive membranes from poly(vinyl alcohol) (PVA) and polyacrylic acid (PAAc) interpenetrating polymer networks (IPN). In this case, the IPN was crosslinked using glutaraldehyde.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyacrylic acid‐poly(vinyl alcohol)‐based interpenetrating hydrogels

Hernández

López

Mijangos

2006

J of Applied Polymer Sci

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Some structural features of hydrogels from poly(acrylic acid) (PAAc) of various crosslinking degrees have been investigated through mechanical and swelling measurements. Interpenetrating polymer hydrogels (IPHs) of poly(vinyl alcohol) (PVA) and PAAc have been prepared by a sequential method: crosslinked PAAc chains were formed in aqueous solution by crosslinking copolymerization of acrylic acid and N,N-methylenebisacrylamide in the presence of PVA. The application of freeze-thaw (F-T) cycles leads to the formation of a PVA hydrogel within the synthesized PAAc hydrogel. The swelling and viscoelastic properties of the IPHs were evaluated as a function of the content of crosslinker and the application of one F-T cycle.

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“…Assuming isotropic swelling of the gel and using the Flory characteristic ratio, C n , for calculation of the end-to-end distance, the mesh size of a swollen polymeric network can be calculated using equation (6) [30]:…”

Section: Network Studiesmentioning

confidence: 99%

Synthesis of poly(acrylamide-co-acrylic acid)-based super-absorbent hydrogels by gamma radiation: study of swelling behaviour and network parameters

Tomar

Gupta

Singhal

et al. 2007

Designed Monomers and Polymers

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Abstract-A series of poly(acrylamide-co-acrylic acid) (poly(AAm-co-AAc))-based super-absorbent hydrogels (SAHs) was prepared by gamma radiation at the dose rate of 15 kGy. The amount of AAm was varied in the range of 30-70% (mol of total monomer) in feed. The co-polymers were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, nuclear magnetic resonance and network parameters, such as average molar mass between cross-links and cross-link density, were determined to explain the swelling behaviour. The experimental results indicated that an increase in the AAm content present in the hydrogels varied from 38.87% to 64.02%, equilibrium water absorbency decreased from 872 to 402 g H 2 O/g sample. The equilibrium water absorbency of various SAHs was investigated in different concentration of saline solutions. The effect of synthesized co-polymer on growth of seeds of ladyfinger is reported.

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Preparation and characterization of pH‐sensitive, interpenetrating networks of poly(vinyl alcohol) and poly(acrylic acid)

Cited by 181 publications

References 15 publications

pH sensitivity and ion sensitivity of hydrogels based on complex-forming chitosan/silk fibroin interpenetrating polymer network

pH sensitivity and ion sensitivity of hydrogels based on complex-forming chitosan/silk fibroin interpenetrating polymer network

Preparation and characterization of polyacrylic acid‐poly(vinyl alcohol)‐based interpenetrating hydrogels

Synthesis of poly(acrylamide-co-acrylic acid)-based super-absorbent hydrogels by gamma radiation: study of swelling behaviour and network parameters

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