The investigation on states of water in different hydrophilic polymers by DSC and FTIR

Guan, Lan; Xu, Huifang; Huang, Dinghai

doi:10.1007/s10965-010-9464-7

Cited by 59 publications

(38 citation statements)

References 25 publications

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“…At higher values of water content, W nf is practically constant. Analogous relation between W nf and W c was observed earlier by us for chitosan=so-dium alginate complex membrane 19 as well as by Ping et al 11 and Guan et al 12 for different hydrophilic polymers. Moreover, for all analyzed membranes, the W f value decreases when the water content decreases.…”

Section: State Of Water In Non-crosslinked and Crosslinked Chitosan Msupporting

confidence: 85%

“…8,15 Literature data 11,12,[16][17][18] and our previous studies 19,20 have indicated that the water structure in the hydrogel is sensitive to the nature of the polymer network.…”

Section: Introductionmentioning

confidence: 89%

“…[7][8][9][10] Much research on the water-swollen polymers by means of differential scanning calorimetry (DSC), NMR spectrometry, FTIR spectroscopy, and other techniques has demonstrated that the state of water in polymer=water systems is different from that of bulk water. [11][12][13][14][15] DSC is in many ways the most convenient and informative method.…”

Section: Introductionmentioning

confidence: 99%

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Water state in chemically and physically crosslinked chitosan membranes

Ostrowska-Czubenko

Pieróg

Gierszewska

2013

J of Applied Polymer Sci

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Chemically and physically crosslinked chitosan membranes were prepared by treating chitosan (Ch) with glutaraldehyde (GA) and sulfuric acid (SA). FTIR and XRD results were employed to confirm the formation of covalent and ionic crosslinks between Ch, GA, and SA. The states of water in non-crosslinked and covalently and ionically crosslinked chitosan membranes containing different amount of water were investigated by low temperature differential scanning calorimetry measurements. The equilibrium swelling in water was examined gravimetrically. Two types of water were found in the polymer samples, i.e., freezing water and nonfreezing water. The effect of crosslinking process on water state and water uptake was analyzed. The water uptake decreased after chitosan crosslinking with GA, but significantly increased after later crosslinking with SA. The amount of non-freezing water was generally smaller in crosslinked membranes. An impact of molecular and supermolecular structure on water uptake and state of water in non-crosslinked and crosslinked chitosan membranes was discussed.

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Section: State Of Water In Non-crosslinked and Crosslinked Chitosan Msupporting

confidence: 85%

“…8,15 Literature data 11,12,[16][17][18] and our previous studies 19,20 have indicated that the water structure in the hydrogel is sensitive to the nature of the polymer network.…”

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Water state in chemically and physically crosslinked chitosan membranes

Ostrowska-Czubenko

Pieróg

Gierszewska

2013

J of Applied Polymer Sci

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“…This topic has been fully investigated in the literature (see Hatakeyama, Tanaka, & Hatakeyama, 2010;Guan, Xu, & Huang, 2010;Kupská, Lapcík, Lapcíková, Záková, & Juríková, 2014, and references therein). One of the more interesting insights is the mechanism through which such effects take place.…”

Section: Introductionmentioning

confidence: 99%

Specific ion effects in polysaccharide dispersions

Tatini

Sarri

Maltoni

et al. 2017

Carbohydrate Polymers

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The specific effects induced by some strong electrolytes or neutral cosolutes on aqueous mixtures of guar gum (GG), sodium alginate (SA) and sodium hyaluronate (SH) were studied through rheology and DSC experiments. The results are discussed in terms of changes in the polymer conformation, structure of the network and hydration properties. This study is also aimed at controlling the viscosity of the aqueous mixturesfor application in green formulations to be used as fracturing fluids for shale gas extraction plants.

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“…Thermal characteristics were evaluated by heating the sample from room temperature to 300°C at a heating rate at 10°C/min [18].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Preparation and performance evaluation of poly (ether-imide) incorporated polysulfone hemodialysis membranes

et al. 2012

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Biocompatible Polysulfone (PSf) hemodialysis membranes were prepared by phase inversion technique using poly (ether-imide) (PEI) as the modification agent and Polyethylene glycol (PEG-200) as the pore former. The effect of PSf/PEI blend ratio on the morphology, hydrophilicity, water content, porosity, glass transition temperature, mechanical strength, biocompatibility and permeation rate of the prepared membranes were studied and were found to be improved significantly by the incorporation of PEI in the dope solution. The scanning electron microscopy (SEM) studies revealed that, incorporation of PEI resulted in the formation of spongy sub-layer and increased the connectivity of pores between sub-layer and bottom layer. The water content and permeation rate of the membranes of PSf/ PEI blend membranes were increased considerably indicating the enhancement of hydrophilicity and it was supported by lower contact angle values of the blend membranes. The existence of single well defined Tg over entire composition established the compatibility between the components in blend membranes. The biocompatibility of membranes was investigated through protein adsorption, platelet adhesion and thrombus formation on the membrane surface. Anticoagulant activity of PSf/PEI blend membranes was evaluated by measuring the activated partial thrombin time (APTT), prothrombin time (PT), thrombin time (TT) and fibrinogen time (FT). The results revealed that antithrombogenicity of PSf/PEI blend membranes was increased significantly. The efficiency of these membranes in removal of urea, creatinine and vitamin B 12 were studied and found to be improved for blend membranes. Thus, it is worth mentioning to note that, the biocompatible PSf/PEI blend membranes prepared in this study would offer immense potential in hemodialysis.

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The investigation on states of water in different hydrophilic polymers by DSC and FTIR

Cited by 59 publications

References 25 publications

Water state in chemically and physically crosslinked chitosan membranes

Water state in chemically and physically crosslinked chitosan membranes

Specific ion effects in polysaccharide dispersions

Preparation and performance evaluation of poly (ether-imide) incorporated polysulfone hemodialysis membranes

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