Tuning interfacial structure and mechanical properties of graphene oxide sheets/polymer nanocomposites by controlling functional groups of polymer

2020 ◽  
Vol 504 ◽  
pp. 144152 ◽  
Author(s):  
Yu Zhang ◽  
Qingèn Zhang ◽  
Dongshuai Hou ◽  
Jinrui Zhang
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Polymer Nanocomposites ◽  
Functional Groups ◽  
Interfacial Structure ◽  
Graphene Oxide Sheets

scholarly journals Mechanical Properties of Graphene Oxide Coupled by Multi-Physical Field: Grain Boundaries and Functional Groups

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 62
Author(s):  
Xu Xu ◽  
Zeping Zhang ◽  
Wenjuan Yao
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Grain Boundaries ◽  
Functional Groups ◽  
Oxygen Content ◽  
Tensile Fracture ◽  
Hydroxyl Groups ◽  
Molecular Configuration ◽  
Spatial Design ◽  
Out Of Plane

Graphene and graphene oxide (GO) usually have grain boundaries (GBs) in the process of synthesis and preparation. Here, we “attach” GBs into GO, a new molecular configuration i.e., polycrystalline graphene oxide (PGO) is proposed. This paper aims to provide an insight into the stability and mechanical properties of PGO by using the molecular dynamics method. For this purpose, the “bottom-up” multi-structure-spatial design performance of PGO and the physical mechanism associated with the spatial structure in mixed dimensions (combination of sp2 and sp3) were studied. Also, the effect of defect coupling (GBs and functional groups) on the mechanical properties was revealed. Our results demonstrate that the existence of the GBs reduces the mechanical properties of PGO and show an “induction” role during the tensile fracture process. The presence of functional groups converts in-plane sp2 carbon atoms into out-of-plane sp3 hybrid carbons, causing uneven stress distribution. Moreover, the mechanical characteristics of PGO are very sensitive to the oxygen content of functional groups, which decrease with the increase of oxygen content. The weakening degree of epoxy groups is slightly greater than that of hydroxyl groups. Finally, we find that the mechanical properties of PGO will fall to the lowest values due to the defect coupling amplification mechanism when the functional groups are distributed at GBs.

The effect of large area graphene oxide (LAGO) nanosheets on the mechanical properties of polyvinyl alcohol

2016 ◽  
Vol 36 (4) ◽  
pp. 399-405 ◽  
Author(s):  
Khalid Nawaz ◽  
Muhammad Ayub ◽  
Noaman Ul-Haq ◽  
M.B. Khan ◽  
Muhammad Bilal Khan Niazi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Molecular Level ◽  
Large Area ◽  
Graphene Oxides ◽  
Elongation At Break ◽  
Graphene Oxide Sheets ◽  
Excellent Improvement

Abstract Large area graphene oxide sheets were synthesized, dispersed in water and used as nanofiller for mechanical improvement in terms of Young’s modulus and ultimate tensile strength (UTS) of polyvinyl alcohol (PVA) at low loading. The molecular level dispersion and interfacial interactions between the graphene oxides and polymeric matrix PVA were the real challenges. An excellent improvement in mechanical properties at 0.35 wt% loading was observed. Modulus improved from 1.58 GPa to 2.72 GPa (~71% improvement), UTS improved from 120 MPa to 197 MPa (~65% improvement), and in spite of these improvements, interestingly, there was no fall in elongation at break at this loading.

THE INFLUENCE OF OXYGEN-CONTAINING FUNCTIONAL GROUPS ON THE SURFACE BEHAVIOR AND ROUGHNESS CHARACTERISTICS OF GRAPHENE OXIDE

NANO ◽  
2013 ◽  
Vol 08 (04) ◽  
pp. 1350045 ◽  
Author(s):  
AHMAD ALLAHBAKHSH ◽  
FARHAD SHARIF ◽  
SAEEDEH MAZINANI
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Three Dimensional ◽  
Diffraction Method ◽  
Force Microscopy ◽  
Atomic Force ◽  
Wire Frame ◽  
Stick Model ◽  
The Individual ◽  
Graphene Oxide Sheets

The effects of oxygen-containing functional groups on the surface roughness of graphene oxide are thoroughly studied using three-dimensional atomic force microscopy images, ball-and-stick model and wire-frame view results. Moreover, X-ray diffraction method and Fourier transform infrared spectroscopy are employed for characterizing the structural and chemical behavior of graphene oxide, respectively. Graphene oxide sheets show a clear concavity on one side when the aggregation of functional groups increased on the other side. This behavior could be the main reason for the surface fluctuation of graphene oxide sheets that is observed in microscopic images. In addition, the individual graphene oxide sheet presents greater values of mean roughness compared to multilayered sheets.

Tuning the Mechanical Properties of Graphene Oxide Paper and Its Associated Polymer Nanocomposites by Controlling Cooperative Intersheet Hydrogen Bonding

ACS Nano ◽  
2012 ◽  
Vol 6 (3) ◽  
pp. 2008-2019 ◽  
Author(s):  
Owen C. Compton ◽  
Steven W. Cranford ◽  
Karl W. Putz ◽  
Zhi An ◽  
L. Catherine Brinson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Graphene Oxide ◽  
Polymer Nanocomposites ◽  
Graphene Oxide Paper

Exceptionally Reinforced Polymer Nanocomposites via Incorporated Surface Porosity on Graphene Oxide Sheets

2017 ◽  
Vol 302 (7) ◽  
pp. 1700039 ◽  
Author(s):  
Hyo Won Kim ◽  
Ji Hye Yoon ◽  
Kyle M. Diederichsen ◽  
Jae Eun Shin ◽  
Byung Min Yoo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Polymer Nanocomposites ◽  
Surface Porosity ◽  
Reinforced Polymer ◽  
Graphene Oxide Sheets

scholarly journals Tuning the interface in epoxy based composites and laminates through epoxy grafted graphene oxide enhances mechanical properties

2021 ◽  
Author(s):  
Prajakta Katti ◽  
Kundan KV ◽  
Subodh Kumar ◽  
Suryasarathi Bose
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Structural Properties ◽  
Polymer Nanocomposites ◽  
Interfacial Adhesion

Improved dispersion together with enhanced interfacial adhesion of reinforcement is the key to superior structural properties in polymer nanocomposites. Herein, graphene oxide (GO) is employed to reinforce epoxy, and in...

Electrical Potential Distribution in Polymethyl Methacrylate-Graphene Oxide Nanocomposites

2016 ◽  
Vol 4 (2) ◽  
pp. 256 ◽  
Author(s):  
Zainuddin Nawawi ◽  
R. F. Kurnia ◽  
N. F. A. Isa ◽  
Z. Buntat ◽  
D. R. Yuniarti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Polymer Nanocomposites ◽  
Potential Distribution ◽  
Research Work ◽  
Electrical Potential ◽  
The Core ◽  
High Voltage Insulator ◽  
Core Components ◽  
Voltage Insulator

<p>Research work of polymer nanocomposites in high voltage insulator becomes interest nowadays. Polymer based and nanofillers are the core components in polymer nanocomposites. By adding such a big amount of nanofiller it would enhance the electrical and mechanical properties of polymers.  However as for today, a little percentage of nanofiller concentration could dramatically enhanced the properties of the polymeric material. Recent research of graphene oxide (GO) nanofiller has brought to this project interest.  This paper presents several methods that have been published to development PMMA (poly methyl methacrylate)/GO nanocomposites and a simulation of PMMA/GO in order to investigate the potential distribution. </p>

scholarly journals Dispersibility of different sized graphene oxide sheets and their reinforcement on polyamide 6 fibers

RSC Advances ◽  
2017 ◽  
Vol 7 (89) ◽  
pp. 56682-56690 ◽  
Author(s):  
Shiyu Zhang ◽  
Yao Cheng ◽  
Weijuan Xu ◽  
Juan Li ◽  
Jun Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Strong Interaction ◽  
Polyamide 6 ◽  
Nanocomposite Fibers ◽  
Graphene Oxide Sheets

PA6/grafted-SGO (g-SGO) nanocomposite fibers show improved mechanical-properties due to excellent dispersibility of g-SGO and strong interaction between g-SGO and PA6.

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