pH influence on rheological and structural properties of chitosan/poly(vinyl alcohol)/layered double hydroxide composites

Bercea, Maria; Bibire, Elena-Livia; Morariu, Simona; Teodorescu, Mirela; Cârjă, Gabriela

doi:10.1016/j.eurpolymj.2015.07.013

Cited by 32 publications

(14 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chemical crosslinking provides a more controllable network structure with uniform pore sizes but requires a careful purification step to remove the free unreacted crosslinker, initiator or monomers with potential toxicity. Physical methods allow the hydrogel formation by physical interactions between macromolecules occuring in well established conditions and, in some cases, their properties and performances are comparable or even superior to those of the chemical hydrogels, as for example reversible sol-gel transition to external stimuli, such as temperature [6] or pH [4,20]. Cryogelation method was applied to PVA containing systems in order to obtain physical hydrogels with high elasticity [1-3, 5, 18, 22-24, 26], excellent swelling and long term stability [26] and very good weight-bearing properties [23], characteristics highly explored in pharmaceutical [1], biomedical and bioengineering applications [1-3, 5, 18, 22, 23, 26].…”

Section: Introductionmentioning

confidence: 99%

“…The hydrogels can be obtained using different chemical or physical methods [1][2][3][4][5][6][7][8][9][10][14][15][16][17][18][19][20][21][22][23][24][25]. Chemical crosslinking provides a more controllable network structure with uniform pore sizes but requires a careful purification step to remove the free unreacted crosslinker, initiator or monomers with potential toxicity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rheological investigation of poly(vinyl alcohol)/poly(N-vinyl pyrrolidone) mixtures in aqueous solution and hydrogel state

2016

Self Cite

View full text Add to dashboard Cite

Rheological behavior of poly(vinyl alcohol) (PVA) and poly(N-vinyl pyrrolidone) (PVP) mixtures in aqueous solutions and hydrogel state was investigated. The complex dependence of the viscosity on PVA/PVP mixture composition could be attributed to cumulative effects of electrostatic interactions, hydrogen bonding or association phenomena. Physical hydrogels were prepared by freezing/thawing method and their viscoelastic properties were followed as a function of number of cryogenic cycles and aging time at 37°C. From swelling experiments, it was observed that the diffusion of water molecules into the hydrogel pores is Fickian (for low number of cryogenic cycles) and it becomes pseudo-Fickian as the sample is submitted to more than 10 freezing/thawing cycles. PVA/PVP hydrogels obtained by physical interactions present a high degree of tailorability and they are suitable candidates for biomedical applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rheological investigation of poly(vinyl alcohol)/poly(N-vinyl pyrrolidone) mixtures in aqueous solution and hydrogel state

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Still, a low surface charge at W s > 275 kJ/kg can favour interparticle association and self-aggregation of chitosan [5], which minimises possible intermolecular interactions between CS and PVOH. Mechanism of PEF-induced modification of CS-PVOH matrix (adopted and modified from [10,11]) (see online version for colours)…”

Section: Particle Size Size Distribution and Zeta Potentialmentioning

confidence: 99%

The effect of pulsed electric fields on the rheology and microstructure of chitosan-poly(vinyl alcohol) composites

Giteru

Oey

Ali

2018

IJNT

View full text Add to dashboard Cite

Colloidal matrices of chitosan (CS) and poly(vinyl alcohol) (PVOH), 0.18 weight fraction CS (w i CS), were subjected to pulsed electric fields (PEF) at specific energy 95-465 kJ/kg. The influence of pH was examined at various pHs 4.1, 4.8 (control), 5.2, 5.6 and 6.1. The treated samples were subsequently analysed for particle size and size distributions, surface zeta potential and viscoelastic behaviour. PEF at specific energy ≥275 kJ/kg resulted in larger particles and a wider range of particle size distribution (PSD). The zeta potential decreased with increasing pH, which corresponded with an increase in particle size. High pH of the inter-mixed blends of CS and PVOH resulted in higher viscosity, but weaker intermolecular associations as depicted by the rapidly declining viscosity. These findings demonstrated the potentials of PEF in the microstructural modification of macromolecular systems.

show abstract

“…[ 10 , 11 , 12 , 13 , 14 ]. In particular, various biomaterials can be easily obtained by environmental-friendly chemical or physical procedures applied to poly(vinyl alcohol) (PVA) [ 15 , 16 ], or to various combinations of PVA with other macromolecules or small molecules [ 17 , 18 , 19 , 20 , 21 , 22 ]. The high interest in the PVA-based hydrogels is due to the exceptional mechanical properties [ 4 , 23 ] and their performances in multifunctional biomaterials [ 19 , 20 , 21 , 22 , 23 , 24 ], but also to their self-healing properties [ 5 , 9 , 11 ] and high elasticity proved in creep and recovery tests [ 9 , 11 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Behavior of Polymer/Protein Hybrid Hydrogels

Bercea¹

2021

Polymers

Self Cite

View full text Add to dashboard Cite

The paper presents the viscoelastic properties of new hybrid hydrogels containing poly(vinyl alcohol) (PVA), hydroxypropylcellulose (HPC), bovine serum albumin (BSA) and reduced glutathione (GSH). After heating the mixture at 55 °C, in the presence of GSH, a weak network is formed due to partial BSA unfolding. By applying three successive freezing/thawing cycles, a stable porous network structure with elastic properties is designed, as evidenced by SEM and rheology. The hydrogels exhibit self-healing properties when the samples are cut into two pieces; the intermolecular interactions are reestablished in time and therefore the fragments repair themselves. The effects of the BSA content, loaded deformation and temperature on the self-healing ability of hydrogels are presented and discussed through rheological data. Due to their versatile viscoelastic behavior, the properties of PVA/HPC/BSA hydrogels can be tuned during their preparation in order to achieve suitable biomaterials for targeted applications.

show abstract

pH influence on rheological and structural properties of chitosan/poly(vinyl alcohol)/layered double hydroxide composites

Cited by 32 publications

References 31 publications

Rheological investigation of poly(vinyl alcohol)/poly(N-vinyl pyrrolidone) mixtures in aqueous solution and hydrogel state

Rheological investigation of poly(vinyl alcohol)/poly(N-vinyl pyrrolidone) mixtures in aqueous solution and hydrogel state

The effect of pulsed electric fields on the rheology and microstructure of chitosan-poly(vinyl alcohol) composites

Self-Healing Behavior of Polymer/Protein Hybrid Hydrogels

Contact Info

Product

Resources

About