Thermal and mechanical properties of graphene oxide nanocomposite hydrogel based on poly (acrylic acid) grafted onto amylose

Abdollahi, Reza; Taghizadeh, Mohammad Taghi; Savani, Samira

doi:10.1016/j.polymdegradstab.2017.11.022

Cited by 38 publications

(16 citation statements)

References 47 publications

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“…Figure 7 a shows a strong absorption band at 1703 cm −1 due to C=O stretching. It also exhibits the presence of CH 2 or CH stretching at 2935 cm −1 , CH 2 deformation at 1450 cm −1 , and C–O stretching coupled with O–H in-plane bending at 1399 and 1165 cm −1 [ 34 ]. The Raman spectrum of the MLGP/PAA hydrogel ( Figure 7 b) was also in good agreement with that of the pure PAA hydrogel.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Reduction of Organic Dyes by Multilayered Graphene Platelets and Silver Nanoparticles in Polyacrylic Acid Hydrogel

et al. 2021

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Graphene oxide has been widely used in the oxidative degradation of environmental pollutants. However, its catalytic role can be questioned as graphene oxide with oxygen-containing functional groups may also act as reactant in oxidative reactions. Herein, hydrogel composites loaded with multilayered graphene platelets showed excellent catalytic performance for the reduction of a wastewater organic pollutant (methylene blue) under NaBH4, which proved the catalytic role of multilayered graphene platelets. The liquid-based direct exfoliation method was used to prepare two-dimensional materials, which is compatible with other liquid phase methods to prepare nanomaterials. Hydrogel composites composed of multilayered graphene platelets, silver nanoparticles, and polyacrylic acid hydrogels were synthesized in water solution under irradiation with ultraviolet light, demonstrating the advantages of synthesizing nanocomposites using the liquid-based direct exfoliation method.

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Section: Resultsmentioning

confidence: 99%

Catalytic Reduction of Organic Dyes by Multilayered Graphene Platelets and Silver Nanoparticles in Polyacrylic Acid Hydrogel

et al. 2021

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“…As shown in Figure 2a, differences in bond vibrations were observed in the PET layer including: hydroxyl vibrations between ca. 3000-3650 cm -1 [62], symmetric and asymmetric CH2 and CH stretching vibrations at 2920 and 2851 cm -1 [63], >C=O carbonyl stretch and/or urethane stretch -NH-CO--O-R at 1713 cm -1 [58,64,65], -C-Ostretch of ester groups at 1018 cm -1 , para-disubstituted benzene stretching at 872 cm -1 [66], -CH2 skeletal vibration at 724 cm -1 [67], -NH2 antisymmetric stretching of urethane at 3430 cm -1 , and -SO3H in sulfonic acids at and cm -1 [59] from the OLE.…”

Section: Effect Of Scco2 Impregnation Of Ole On Film Structuresmentioning

confidence: 99%

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Cejudo-Bastante

Cran

Casas

et al. 2019

The Journal of Supercritical Fluids

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Poly(ethylene terephthalate)/polypropylene (PET/PP) films containing olive leaf extract (OLE) were obtained by supercritical solvent impregnation (SSI) in batch (BM) and semi-continuous (SM) modes.The study focused on the impact of pressure, temperature, CO2 flow and OLE on the properties of the impregnated films. Thermal analysis of non-impregnated samples revealed a decrease in the crystallinity of PP layer treated at 35 ºC and an increase in the Tg of PET treated at 55 ºC due to CO2 sorption. In impregnated samples, high pressures caused a decrease in the crystallinity of PP layer, whereas PET layer remained unaffected. Higher pressures favour impregnation in BM, whereas different trends were found for SM impregnations. Although the film properties were not compromised after impregnation, the CO2 stream used in SM slightly weakened the impregnated films. Overall, conditions of 400 bar and 35ºC in BM were favorable for producing highly antioxidant films with minor structural modifications.

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“…PAA was selected because it is a nonbiodegradable and hydrophilic material. It also shows a high stability and high shear resistance, which are important factors for the in vivo experiment . Moreover, PAA prevents the nonspecific adsorption of proteins and reduces cell adhesion owing to its strong hydrophilicity and negative charge at the physiological condition .…”

Section: Introductionmentioning

confidence: 99%

Modulation of Foreign Body Reaction against PDMS Implant by Grafting Topographically Different Poly(acrylic acid) Micropatterns

Lee

Shin

Yoo

et al. 2019

Macromolecular Bioscience

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The surface of poly(dimethylsiloxane) (PDMS) is grafted with poly(acrylic acid) (PAA) layers via surface‐initiated photopolymerization to suppress the capsular contracture resulting from a foreign body reaction. Owing to the nature of photo‐induced polymerization, various PAA micropatterns can be fabricated using photolithography. Hole and stripe micropatterns ≈100‐µm wide and 3‐µm thick are grafted onto the PDMS surface without delamination. The incorporation of PAA micropatterns provides not only chemical cues by hydrophilic PAA microdomains but also topographical cues by hole or stripe micropatterns. In vitro studies reveal that a PAA‐grafted PDMS surface has a lower proliferation of both macrophages (Raw 264.7) and fibroblasts (NIH 3T3) regardless of the pattern presence. However, PDMS with PAA micropatterns, especially stripe micropatterns, minimizes the aggregation of fibroblasts and their subsequent differentiation into myofibroblasts. An in vivo study also shows that PDMS samples with stripe micropatterns polarized macrophages into anti‐inflammatory M2 macrophages and most effectively inhibits capsular contracture, which is demonstrated by investigation of inflammation score, transforming‐growth‐factor‐β expression, number of macrophages, and myofibroblasts as well as the collagen density and capsule thickness.

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Thermal and mechanical properties of graphene oxide nanocomposite hydrogel based on poly (acrylic acid) grafted onto amylose

Cited by 38 publications

References 47 publications

Catalytic Reduction of Organic Dyes by Multilayered Graphene Platelets and Silver Nanoparticles in Polyacrylic Acid Hydrogel

Catalytic Reduction of Organic Dyes by Multilayered Graphene Platelets and Silver Nanoparticles in Polyacrylic Acid Hydrogel

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Modulation of Foreign Body Reaction against PDMS Implant by Grafting Topographically Different Poly(acrylic acid) Micropatterns

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