Polymer functional group impact on the thermo-mechanical properties of polyacrylic acid, polyacrylic amide- poly (vinyl alcohol) nanocomposites reinforced by graphene oxide nanosheets

Al-shammari, Athmar K.; Al‐Bermany, Ehssan

doi:10.1007/s10965-022-03210-3

Cited by 19 publications

(7 citation statements)

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“…The size of the crystalline domain region can also influence the mechanical properties of a polymer substrate. Polymers with large crystalline domain regions have lower polymer chain flexibility, which could increase the mechanical properties of the substrate. , The height and width of the peaks in the XRD data were used to calculate the average size of the crystalline domain region with the Scherrer equation . The crystalline domain sizes for PCL, R-PLCL, C-PLCL, circumferential layer PCL/PLCL, and radial layer PCL/PLCL substrates were 21.66 ± 0.51, 17.22 ± 0.43, 17.65 ± 0.39, 18.13 ± 0.41, and 18.39 ± 0.38 nm.…”

Section: Resultsmentioning

confidence: 99%

Elastomeric Trilayer Substrates with Native-like Mechanical Properties for Heart Valve Leaflet Tissue Engineering

Snyder

Jana

2023

ACS Biomater. Sci. Eng.

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Heart valve leaflets have a complex trilayered structure with layer-specific orientations, anisotropic tensile properties, and elastomeric characteristics that are difficult to mimic collectively. Previously, trilayer leaflet substrates intended for heart valve tissue engineering were developed with nonelastomeric biomaterials that cannot deliver native-like mechanical properties. In this study, by electrospinning polycaprolactone (PCL) polymer and poly(l-lactide-co-ε-caprolactone) (PLCL) copolymer, we created elastomeric trilayer PCL/PLCL leaflet substrates with native-like tensile, flexural, and anisotropic properties and compared them with trilayer PCL leaflet substrates (as control) to find their effectiveness in heart valve leaflet tissue engineering. These substrates were seeded with porcine valvular interstitial cells (PVICs) and cultured for 1 month in static conditions to produce cell-cultured constructs. The PCL/PLCL substrates had lower crystallinity and hydrophobicity but higher anisotropy and flexibility than PCL leaflet substrates. These attributes contributed to more significant cell proliferation, infiltration, extracellular matrix production, and superior gene expression in the PCL/PLCL cell-cultured constructs than in the PCL cell-cultured constructs. Further, the PCL/PLCL constructs showed better resistance to calcification than PCL constructs. Trilayer PCL/PLCL leaflet substrates with native-like mechanical and flexural properties could significantly improve heart valve tissue engineering.

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Section: Resultsmentioning

confidence: 99%

Elastomeric Trilayer Substrates with Native-like Mechanical Properties for Heart Valve Leaflet Tissue Engineering

Snyder

Jana

2023

ACS Biomater. Sci. Eng.

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“…The first degradation step of PMMA between 160-230 °C, with the peak thermal degradation temperature (T d ) at 189 °C, is associated with the initial degradation of weak links or random chain scission by unzipping or depropagation. [7,21,42,43] The second degradation step of PMMA between 300−430 °C, with a T d of 394 °C, is the main degradation step, which is attributed to radical-induced decomposition of the molecular chains possessing unsaturated end groups formed by disproportionation. [42] The first degradation step of PMAA is located between 155−290 °C, with a T d of 227 o C, and the second degradation step is between 365-470 °C, with a T d of 446 o C. The first degradation step is associated with water molecules loss through the formation of intra-and inter-molecular anhydride that links to the de-carboxylation of a fraction of the -COOH groups, [44,45] whereas the second step is related to polymer main chain degradation and the elimination of CO and CO 2 and formation of a small concentration of unsaturation.…”

Section: Resultsmentioning

confidence: 99%

“…[2] Graphene is the stiffest and strongest material ever measured, possessing exceptional thermal, mechanical, and electrical properties. [1,3] Graphene offers an extraordinary DOI: 10.1002/macp.202300101 opportunity to improve the performance of polymers in comparison with microfillers, [4] and it has been studied for a wide range of applications, such as gas barrier, [5] mechanical performance, [6,7] hydrogen storage, [8] and supercapacitors. [9] To achieve a stable and homogeneous nanofiller dispersion in the polymer matrix, their strong interfacial interaction is key, which may lead to property enhancements in polymer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Functional Groups of Polymers on Their Adsorption Behavior on Graphene Oxide Nanosheets

Al‐Bermany

Chen

2023

Macro Chemistry & Physics

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Graphene‐based polymer nanocomposites are emerging materials for both fundamental research and industrial applications. The influence of polymer functional groups on their adsorption behavior onto graphene oxide (GO) nanosheets is investigated, with poly(methyl methacrylate) (PMMA), poly(methyl methacrylate‐co‐methacrylic acid) (PMMA‐co‐MAA), and poly(methacrylic acid) (PMAA) having the same backbone but different functional side groups selected as the model polymers. Fourier transform infrared spectroscopy and X‐ray diffraction results confirm the interfacial interaction between the polymer and GO. Thermogravimetric analysis reveals notable enhancements in the amount of the adsorbed polymer up to 30.6 wt.% for PMMA‐co‐MAA/GO and 49.7 wt.% PMAA/GO compared with 18.7 wt.% for PMMA/GO. The water contact angle decreases from 71.3o for PMMA/GO to 69.1° for PMMA‐co‐MAA/GO and to 61.2° for PMAA/GO. The further washing process reduces the adsorption amount for the polymer/GO hybrid. Overall, the polar functional groups of the polymer directly influence the polymer adsorption behavior onto GO.

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“…Polymer is commonly utilized for dental bases, artificial teeth, cements, pigments, provisional crowns, endodontic fillings, and tissue conditioners, and other applications [20,21]. A denture material must withstand the masticator burden over an extended period with minimal irritation [22].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity and Optical Behavior for Restoration of Micro and Nano Dental Fillers Using Functional Graphene Nanosheets with Polymethyl Methacrylate

Hassan,

Hamidinezhad,

Al-Bermany

2024

Nano Biomedicine and Engineering

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Polymer-based graphene nanocomposites significantly impact dental filler materials and antibacterial applications. Polymethyl methacrylate (PMMA) was used to improve the properties of nano and hybrid-dental fillings reinforced using synthesis graphene oxide (GO). Developed acoustic-solutionsonication-casting procedures were used to fabricate the new PMMA-dental filler-GO nanocomposites and the morphology, structure, optical properties, and antibacterial activity of samples were investigated. Fourier transforms infrared (FTIR) exposed good interaction among the PMMA, filling, and GO nanosheets. Scanning electron microscopy (SEM) and optical microscope (OPM) images revealed homogeneous samples and fine dispersion with improved morphology and overcoming cavities and cracks in the samples. The incorporation of PMMA and PMMA-GO in the nanocomposites showed promising properties: Absorption peak presented at 320 nm of samples enhanced from 0.8 (N1) to 0.98 (N3) for nano-fillers and from 0.7 (H1) to 0.97 (H3) for hybrid-fillers. Bandgap reduction from 3.35 (N1) to 3.15 (N3) for nano-fillers and from 3.10 (H1) to 2.75 (H3) for hybrid-fillers in allowed indirect transition, whereas it reduced from 3.38 (N1) to 3.00 (N3) for nanofillers and from 3.05 (H1) to 2.75 (H3) for hybrid-fillers in forbidden indirect transition after the contribution of PMMA and GO nanosheets. The inhibition zone of the Klebsiella bacteria significantly expanded from 17 to 23 mm for nano-fillers and from 16 to 22 mm for hybrid-fillers. Nanofillers nanocomposites presented better properties and inhabitances zone diameter of antibacterial compared with non-reinforced dental fillers.

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Polymer functional group impact on the thermo-mechanical properties of polyacrylic acid, polyacrylic amide- poly (vinyl alcohol) nanocomposites reinforced by graphene oxide nanosheets

Cited by 19 publications

References 50 publications

Elastomeric Trilayer Substrates with Native-like Mechanical Properties for Heart Valve Leaflet Tissue Engineering

Elastomeric Trilayer Substrates with Native-like Mechanical Properties for Heart Valve Leaflet Tissue Engineering

Effect of the Functional Groups of Polymers on Their Adsorption Behavior on Graphene Oxide Nanosheets

Antibacterial Activity and Optical Behavior for Restoration of Micro and Nano Dental Fillers Using Functional Graphene Nanosheets with Polymethyl Methacrylate

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