Thermal and mechanical properties of cationic guar gum/poly(acrylic acid) hydrogel membranes

Huang, Yihong; Lü, Jun; Xiao, Changfa

doi:10.1016/j.polymdegradstab.2007.02.011

Cited by 104 publications

(58 citation statements)

References 27 publications

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“…6. The first endothermic peak has been assigned to the evaporation of water from hydrophilic groups in the polymers and the second one corresponds to a thermal degradation through intramolecular anhydride formation and water elimination [68][69][70][71]. After the second endothermic peak, the onset of a broad exothermic peak (∼300 • C) is visible in the thermograms, Fig.…”

Section: Characterization Of the Polymer-polymer Interactionsmentioning

confidence: 99%

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Films based on chitosan polyelectrolyte complexes for skin drug delivery: Development and characterization

Silva

Pereira

Ramalho

et al. 2008

Journal of Membrane Science

116

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a b s t r a c tNovel chitosan based polyelectrolyte complexes (PEC) were developed and optimized in order to obtain films possessing the optimal functional properties (flexibility, resistance, water vapour transmission rate and bioadhesion) to be applied on skin. The development was based on the combination of chitosan and two polyacrylic acid (PAA) polymers with different crosslinkers and crosslinking densities. The interaction between the polymers was maximized controlling the pH, and by forming the films at a pH value close to the pK a of the respective components as identified by potentiometric and turbidimetric titrations. The action of glycerol, PEG200, Hydrovance and trehalose upon the functional properties of the films was also evaluated. Glycerol was found to improve the film properties in terms of flexibility, resistance and water vapour transmission rate (WVTR) with a maximum effect at 30%. The application of a pressure sensitive adhesive (PSA) significantly improved bioadhesion with a negligible influence in the resistance and flexibility of the films.The optimized film, including adhesive, has shown very good properties for application in the skin and represents a very promising formulation for further incorporation of drugs for topical and transdermal administration.

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Section: Characterization Of the Polymer-polymer Interactionsmentioning

confidence: 99%

“…6. It is probably related with a second degradation process involving the destruction of carboxylic groups with CO 2 elimination and chain scission [69,70].…”

Section: Characterization Of the Polymer-polymer Interactionsmentioning

confidence: 99%

Films based on chitosan polyelectrolyte complexes for skin drug delivery: Development and characterization

Silva

Pereira

Ramalho

et al. 2008

Journal of Membrane Science

116

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“…The weight loss about 6.4 wt% below 251ºC for CMC-g-PNaA (corresponding to an endothermic step at 248ºC) and about 4.9 wt% below 254.7ºC for CMC-g-PNaA/ MS (corresponding to an endothermic step at 253ºC) can be ascribed to the removal of water absorbed, the dehydration of saccharide rings in the chain of CMC [36]. The successive weight loss about 20.4 wt% (251~432ºC) for CMC-g-PNaA and about 17.3 wt% (255~436ºC) for CMC-gPNaA/MS can be attributed to the breaking of C-O-C bonds in CMC chains (corresponding to the endothermic peaks at 399ºC for CMC-g-PNaA and 401ºC for CMC-g-PNaA/MS) and the elimination of water molecule derived from the two neighboring carboxylic groups of the grafted PNaA chains due to the formation of anhydride (corresponding to the endothermic peak at 424ºC for CMC-g-PNaA and 425ºC for CMC-g-PNaA/MS) [37]. However, the endothermic peak of CMC-g-PNaA/MS at 425ºC is obviously weaker than that of CMC-gPNaA, and the new endothermic peak at 455ºC also appeared in the DSC curve of CMC-g-PNaA/MS.…”

Section: Results and Discussion 31 Ftir Spectra Analysismentioning

confidence: 99%

A pH-, salt- and solvent-responsive carboxymethylcellulose-g-poly(sodium acrylate)/medical stone superabsorbent composite with enhanced swelling and responsive properties

Wang¹,

Xu²,

Wang³

2011

Express Polym. Lett.

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Free-radical graft copolymerization among sodium carboxymethylcellulose (CMC), partially neutralized acrylic acid (NaA), medical stone (MS) and crosslinker N,N'-methylene-bis-acrylamide (MBA) was performed to prepare new carboxymethylcellulose-g-poly(sodium acrylate)/medical stone (CMC-g-PNaA/MS) superabsorbent composites. Fourier transform infrared (FTIR) spectra, thermogravimetry- differential scanning calorimetry (TG-DSC) and field emission scanning electromicrsocopic (FESEM) analysis confirmed that NaA had been grafted onto CMC backbone and MS participated in polymerization, and the thermal stability and surface morphologies were improved by the addition of MS. Energy dispersive spectrometer (EDS) and elemental map (EM) analyses revealed the better distribution of MS in the CMC-g-PNaA matrix. The incorporation of 20 wt% MS clearly enhanced the water absorption by 100% (from 317 to 634 g/g). The developed composites showed enhanced swelling rate and On-Off switching swelling characteristics in various pH solutions, saline solutions and hydrophilic organic solvents, which represented interesting and reversible pH-, saline- and hydrophilic organic solvent-responsive characteristics. In addition, the composite exhibited intriguing time-dependent kinetic swelling properties in various heavy metal solutions

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“…The second stage from 300 C to 480 C was attributed to the dehydration of saccharide rings, removal of molecular side chain, the breaking of inter-molecular hydrogen bond and the dehydration of intramolecular hydroxyl [27]. The last weight loss stage from 480 C to 600 C was attributed to the breaking of intra-molecular bonds, such as the cross-linked network structure and the main-chain [28,29]. The temperatures in the different weight loss of composites also could be obtained from Figs.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Preparation and characterization of konjac glucomannan-acrylic acid-diatomite composites

Chen

Zhang

2015

Polym. Compos.

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A novel konjac glucomannan (KGM)‐acrylic acid‐diatomite composite (KGAD) was synthesized by the solution polymerization of partially neutralized acrylic acid (AA) on to KGM and diatomite (DT), using potassium persulfate as a free radical initiator, in the presence of Trimethylolpropane Trimethacrylate (TPTA) as a crosslinking agent. The structure and morphology of KGAD were characterized by using FT‐infrared, X‐ray diffraction, scanning electron microscopy. Besides, the thermal stability as well as the salt absorption of the composites was investigated by the thermogravimetric analysis and the swelling rate test, respectively. The results showed that the interactions between KGM‐AA (KGA0) and DT could be generated through hydrogen bond formation. Besides, the crystal of composites became rules and grew well with the addition of DT. It was also found that the appropriate amount of DT could be dispersed uniformly with a single crystal state in the matrix of KGA0 while excessive DT caused aggregation, inducing an irregular distribution in the matrix. In addition, the thermal stability of KGAD was improved based on the introduction of DT into the polymer network. POLYM. COMPOS., 37:3384–3390, 2016. © 2015 Society of Plastics Engineers

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Thermal and mechanical properties of cationic guar gum/poly(acrylic acid) hydrogel membranes

Cited by 104 publications

References 27 publications

Films based on chitosan polyelectrolyte complexes for skin drug delivery: Development and characterization

Films based on chitosan polyelectrolyte complexes for skin drug delivery: Development and characterization

A pH-, salt- and solvent-responsive carboxymethylcellulose-g-poly(sodium acrylate)/medical stone superabsorbent composite with enhanced swelling and responsive properties

Preparation and characterization of konjac glucomannan-acrylic acid-diatomite composites

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