Composite hydrogels based on polyacrylamide and cellulose: Synthesis and functional properties

Buyanov, A. L.; Gofman, I. V.; Божкова, С. А.; Сапрыкина, Н. Н.; Нетылько, Г. И.; Хрипунов, А. К.; Smyslov, R. Yu.; Афанасьев, А. В.; Panarin, E. F.

doi:10.1134/s1070427216050141

Cited by 14 publications

(12 citation statements)

References 11 publications

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“…For SESANS experiments, we have chosen one of the most interesting BC-PAAm hydrogels for practical use, which recently successfully passed the preliminary tests as artificial cartilage during in vivo experiments conducted on rabbits [20]. As tentative experiments showed, the measurements of the samples swollen in heavy water are not informative (no spin-echo depolarization), we have tested the option of introducing terbium ions into hydrogels by swelling the samples in a solution of TbCl 3 at two concentrations: 0.36 and 1.42 mg/mL for HG1Tb and HG2Tb, respectively (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…In case of an anisotropic sample structure, it is likely to observe different SESANS signals for different sample orientations relatively to the setup geometry [19]. In the present work, two different ideas were considered to describe the obtained experimental results: a scattering model of oriented cylinders and neutron refraction [20]. In the present work, the scattering model of oriented cylinders is considered to describe the obtained experimental results [20].…”

Section: Discussionmentioning

confidence: 99%

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High-strength bacterial cellulose–polyacrylamide hydrogels: Mesostructure anisotropy as studied by spin-echo small-angle neutron scattering and cryo-SEM

Величко

Buyanov

Сапрыкина

et al. 2017

European Polymer Journal

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Submicron-and micron-scale structures of composite hydrogels based on bacterial cellulose (BC) and polyacrylamide were studied by spin-echo small-angle neutron scattering (SESANS) and cryo-scanning electron microscopy (cryo-SEM). These hydrogels possessing the structure of interpenetrating polymer network were synthesized via free-radical polymerization of acrylamide carried out in the pellicle of BC swollen in the reaction solution. No neutron scattering was observed for the samples swollen in heavy water to the equilibrium state, but the SESANS signal appeared when TbCl 3 salt was added to the solvent. It is the unusual effect, which may be very helpful for SESANS studying of other hydrogel systems. The SESANS dependences obtained for these samples revealed the anisotropy of mesostructure for the hydrogels under investigation. Density inhomogeneities on the characteristic scale of 11.5 ± 0.5 µm were detected in one fixed orientation of the sample, i.e. with the growth plane of BC parallel to the plane formed by the neutron beam and the spin-echo length. The uniaxial anisotropy revealed agrees with a recently proposed model, which attributes this behavior to the existence of tunnel-like oriented structures inside BC. The evidence of such type of mesostructure anisotropy of BC and BC-PAAM hydrogels was obtained by using the cryo-SEM method.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

High-strength bacterial cellulose–polyacrylamide hydrogels: Mesostructure anisotropy as studied by spin-echo small-angle neutron scattering and cryo-SEM

Величко

Buyanov

Сапрыкина

et al. 2017

European Polymer Journal

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“…During these tests, the high level of the integration of hydrogel implants with surrounding living tissues was evidenced. In particular, the formation of a "shell" of calcium phosphate spherulites in the hydrogel volume near the implant-bone interface has been registered and this effect insures the mechanically strong connection of the implants with the bone tissues, which is very important for practical use of these materials as artificial cartilage tissues (Buyanov et al, 2016, Gofman et al, 2018. 3 As it was shown in our investigations the mechanical behavior of hydrogels containing two types of cellulose, BC or PC, can differs significantly.…”

Section: Introductionmentioning

confidence: 99%

“…In the synthesis of our hydrogels, we used cellulose of two types as the reinforcing component, namely BC or regenerated plant cellulose (PC). It was shown in the in-vivo experiments with the laboratory animals that both types of hydrogels are characterized by a perfect biocompatibility and can work during long periods of time in the animals' joints as the artificial substituent of cartilage (Buyanov et al, 2016). During these tests, the high level of the integration of hydrogel implants with surrounding living tissues was evidenced.…”

Section: Introductionmentioning

confidence: 99%

High-strength cellulose–polyacrylamide hydrogels: Mechanical behavior and structure depending on the type of cellulose

Buyanov

Gofman

Сапрыкина

2019

Journal of the Mechanical Behavior of Biomedical Materials

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Two types of high-strength composite hydrogels possessing the structure of interpenetrating polymer networks were synthesized via free-radical polymerization of acrylamide carried out straight within the matrix of plant or bacterial cellulose swollen in the reactive solution. The mechanical behavior of synthesized hydrogels subjected to the action of compressive deformations with different amplitude values was studied. The analysis of the stress-strain curves of compression tests of the hydrogels of both types obtained in different test conditions demonstrates the substantial difference in their mechanical behavior. Both the plant cellulose-based and bacterial cellulose-based hydrogels withstand successfully the compression with the amplitude up to 80 %, but the bacterial cellulose-based compositions demonstrate in the multiple compression tests the substantial decrease of the mechanical stiffness caused by the action of compressions. This effect takes place straightly during the multiple cyclic compression tests or in the course of relaxation of previously compressed samples in water in unloaded state during 2-3 days after the first compressive tests. Being subjected to the action of the extremely sever compression (up to 80 %) the bacterial cellulose-based hydrogel varies greatly its mechanical behavior: during the subsequent compressions the stiffness of the material keeps extremely small (as compared to that registered in the first compression) up to the deformations as high as 50-60 % with the dramatic increase of the stiffness during the further loading. This unusual effect can be explained by the deep reorganization of the intermolecular structure of the material with the stress-induced reorientation of cellulose micro-fibrils, fragmentation and disintegration of the interpenetrating networks structure with the breaking of the covalent bonds in the matrix polymer. Submicron-and micron-scale specific features of structures of composite hydrogels of both types were studied by cryo-scanning electron microscopy to explain the peculiarities of observed mechanical effects.

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“…In recent years, the investigation of cellulose has grown drastically for alcohol production, removal of toxic and heavy metal ions, catalyst, and as packaging material . Furthermore, there is plentiful investigation about the incorporation of cellulose into polymeric matrices to improve the mechanical strength and toughness of hydrogels such as double network hydrogel systems prepared with bacterial cellulose, or other preparation methods using different cellulose as a part composites of hydrogels . Most of these studies demonstrated that the mechanical strength and toughness of hydrogels increased upon incorporation of various cellulose types within hydrogel matrix with different ways.…”

Section: Introductionmentioning

confidence: 99%

Improved mechanical strength of p(AAm) interpenetrating hydrogel network due to microgranular cellulose embedding

Şahiner

Demirci

2017

J of Applied Polymer Sci

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Here, polyacrylamide [p(AAm)]-based hydrogels were synthesized via redox polymerization technique in the presence of various amounts of microgranular cellulose (MGCell) such as 0, 10, 25, 50, 100, and 150 mg MGCell/g. The synthesized p(AAm)-MGCell interpenetrating hydrogels were characterized spectroscopically by FTIR, thermally by TGA analysis, and mechanically via dynamic mechanical measurements. Furthermore, the effect of the amount of MGCell in p(AAm) hydrogels on swelling% (S%) degree and mechanical strength was investigated. It was found that the S% was decreased from 727 6 9 to 667 6 6, 642 6 8 and 619 6 10, 568 6 6 for p(AAm)-MGCell interpenetrating network hydrogels containing 10, 50, 100, and 150 mg MGCell, respectively. On the other hand, the Young modulus of p(AAm)-based hydrogels increased from 2.8 6 0.2 kPa to 3.1 6 0.03, 3.4 6 0.1, 3.6 6 0.3 and 4.3 6 0.3 kPa with the incorporation of 10, 50, 100, and 150 mg MGCell into p(AAm) hydrogels. V C 2017 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2017, 134, 44854.

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Composite hydrogels based on polyacrylamide and cellulose: Synthesis and functional properties

Cited by 14 publications

References 11 publications

High-strength bacterial cellulose–polyacrylamide hydrogels: Mesostructure anisotropy as studied by spin-echo small-angle neutron scattering and cryo-SEM

High-strength bacterial cellulose–polyacrylamide hydrogels: Mesostructure anisotropy as studied by spin-echo small-angle neutron scattering and cryo-SEM

High-strength cellulose–polyacrylamide hydrogels: Mechanical behavior and structure depending on the type of cellulose

Improved mechanical strength of p(AAm) interpenetrating hydrogel network due to microgranular cellulose embedding

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