scholarly journals Efficient interfacial interaction for improving mechanical properties of polydimethylsiloxane nanocomposites filled with low content of graphene oxide nanoribbons

RSC Advances ◽  
2017 ◽  
Vol 7 (36) ◽  
pp. 22045-22053 ◽  
Author(s):  
Neng-Jian Huang ◽  
Jing Zang ◽  
Guo-Dong Zhang ◽  
Li-Zhi Guan ◽  
Shi-Neng Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Filler Content ◽  
Interfacial Interaction ◽  
Solvent Free ◽  
The Other ◽  
Graphene Oxide Nanoribbons ◽  
Free Process ◽  
Reinforcement Efficiency

GONR-filled H-t-PDMS nanocomposites were fabricated by using a facile solvent-free process, and the reinforcement efficiency of GONRs at low filler content is superior to those of the other carbon nano-fillers.

scholarly journals Influence of artificial aging: mechanical and physicochemical properties of dental composites under static and dynamic compression

2021 ◽  
Author(s):  
D. C. Gornig ◽  
R. Maletz ◽  
P. Ottl ◽  
M. Warkentin
Keyword(s):  
Mechanical Properties ◽  
Water Sorption ◽  
Artificial Aging ◽  
Filler Content ◽  
Dynamic Compression ◽  
The Other ◽  
Chemical Degradation ◽  
Dental Composites ◽  
Compression Tests ◽  
Acid Ph

Abstract Objective The aim of the study was to evaluate the influence of filler content, degradation media and time on the mechanical properties of different dental composites after in vitro aging. Materials and Methods Specimens (1 mm3) of three commercially available composites (GrandioSO®, Arabesk Top®, Arabesk Flow®) with respect to their filler content were stored in artificial aging media: artificial saliva, ethanol (60%), lactic acid (pH 5) and citric acid (pH 5). Parameters (Vickers microhardness, compressive strength, elastic modulus, water sorption and solubility) were determined in their initial state (control group, n = 3 for microhardness, n = 5 for the other parameters) and after 14, 30, 90 and 180 days (n = 3 for microhardness, n = 5 for the other parameters for each composite group, time point and media). Specimens were also characterized with dynamic-mechanical-thermal analysis (compression tests, F =  ± 7 N; f = 0.5 Hz, 1 Hz and 3.3 Hz; t = 0–170 °C). Results Incorporation of fillers with more than 80 w% leads to significantly better mechanical properties under static and dynamic compression tests and a better water sorption behavior, even after chemical degradation. The influence of degradation media and time is of subordinate importance for chemical degradation. Conclusion Although the investigated composites have a similar matrix, they showed different degradation behavior. Since dentine and enamel occur only in small layer thickness, a test specimen geometry with very small dimensions is recommended for direct comparison. Moreover, the use of compression tests to determine the mechanical parameters for the development of structure-compatible and functionally adapted composites makes sense as an additional standard. Clinical relevance Preferential use of highly filled composites for occlusal fillings is recommended.

Graphene Composites

2019 ◽  
Vol 23 ◽  
pp. 57-63 ◽  
Author(s):  
Chin Wei Lai
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Polymer Composites ◽  
Applied Research ◽  
Scientific Literature ◽  
Filler Content ◽  
2D Materials ◽  
Industrial Applications ◽  
Research Interest ◽  
Two Dimensional

This chapter reviews recent development of graphene-based polymer composites. The formation of graphene oxide and graphene are a vital two dimensional (2D) material has received a lot of research interest in commercialization aspect due to its excellent electrical, thermal as well as mechanical properties at very low filler content. In this manner, utilization of graphene-based polymer composites with different polymer matrixes have been attracted increasing attention in recent years for both fundamental studies and applied research into industrial applications in many fields. Herein, novel properties of polymer (epoxy, polystyrene, and PANI) / graphene composites will be reviewed along with detailed examples drawn from the scientific literature. Keywords: Graphene-based polymer composites, thermo-mechanical properties, two dimensional (2D) materials

The different effect of reduced graphene oxide and graphene oxide on the performance of chitosan by using homogenous fillers

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34153-34158 ◽  
Author(s):  
Tiannan Zhou ◽  
Xiaodong Qi ◽  
Hongwei Bai ◽  
Qiang Fu
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Interfacial Interaction ◽  
Reduced Graphene ◽  
Strong Interfacial Interaction

The different mechanism of the improved mechanical properties of CS–GO and CS–rGO nanocomposites are strong interfacial interaction and recrystallization, respectively.

Improved Mechanical Properties of Graphene Oxide/Poly(ethylene oxide) Nanocomposites by Dynamic Interfacial Interaction of Coordination

2014 ◽  
Vol 67 (1) ◽  
pp. 121 ◽  
Author(s):  
Chen Lin ◽  
Yi-Tao Liu ◽  
Xu-Ming Xie
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Ethylene Oxide ◽  
High Performance ◽  
Interfacial Interaction ◽  
Divalent Metal Ions ◽  
Strong Interfacial Interaction ◽  
Poly Ethylene Oxide ◽  
Coordination Bonds ◽  
Poly Ethylene

A simple and cost-effective strategy to create a strong interfacial interaction of coordination bonds in graphene oxide/poly(ethylene oxide) (GO/PEO) nanocomposites by divalent metal ions are demonstrated in this study. The strong interfacial interaction realizes efficient load transfer during the tensile process to significantly improve the mechanical properties of PEO. In addition, the dynamic interfacial interaction of coordination bonds minimizes the elongation loss. This strategy is applicable to a variety of polymer matrices containing coordination atoms, thus opens up a new opportunity for high-performance GO/polymer nanocomposites with significantly improved mechanical properties.

scholarly journals Hydroxyl-Terminated Triazine Derivatives Grafted Graphene Oxide for Epoxy Composites: Enhancement of Interfacial and Mechanical Properties

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1866 ◽  
Author(s):  
Lichun Ma ◽  
Yingying Zhu ◽  
Guangshun Wu ◽  
Xiaoru Li ◽  
Chongao Tian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Flexural Strength ◽  
Epoxy Matrix ◽  
Interfacial Interaction ◽  
Epoxy Composites ◽  
Functionalized Graphene Oxide ◽  
Pure Epoxy ◽  
Triazine Derivatives ◽  
Flexural Tests

An effective approach to the fabrication of progressive epoxy nanocomposites by the incorporation of hydroxyl-terminated dendrimers functionalized graphene oxide (GO-TCT-Tris) is reported. The relationship between surface grafting, chemical construction, morphology, dispersion, and interfacial interaction as well as the corresponding mechanical properties of the composites were studied in detail. It was shown that hydroxyl-terminated triazine derivatives have been resoundingly bonded onto the GO surface through covalent bonding, which effectively improved the dispersion and compatibility of GO sheets in epoxy resin. The tensile and flexural tests manifested that the GO-TCT-Tris/epoxy composites exhibited greater tensile/flexural strength and modulus than either the pure epoxy or the GO/epoxy composites. For GO-TCT-Tris (0.10 wt%)/epoxy composite, the tensile strength and elastic modulus increased from 63 ± 4 to 89 ± 6 MPa (41.27%) and from 2.8 ± 0.1 to 3.6 ± 0.2 GPa (28.57%), and the flexural strength and modulus increased from 106 ± 5 to 158 ± 6 MPa (49.06%) and from 3.0 ± 0.1 to 3.5 ± 0.2 GPa (16.67%), respectively, compared to the pure epoxy matrix. Moreover, the fractographic analysis also illustrated the ameliorative interfacial interaction between GO-TCT-Tris and epoxy matrix.

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