scholarly journals A Mechanics Based Surface Image Interpretation Method for Multifunctional Nanocomposites

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1578 ◽  
Author(s):  
Brina J. Blinzler ◽  
Ragnar Larsson ◽  
Karolina Gaska ◽  
Roland Kádár
Keyword(s):  
Thermal Properties ◽  
Functional Properties ◽  
Material Properties ◽  
Mechanical Response ◽  
Graphene Nanosheets ◽  
Polymeric Materials ◽  
Mechanical And Thermal Properties ◽  
Graphite Nanoplatelets ◽  
Modeling Framework ◽  
Surface Image

Graphene nanosheets and thicker graphite nanoplatelets are being used as reinforcement in polymeric materials to improve the material properties or induce new functional properties. By improving dispersion, de-agglomerating the particles, and ensuring the desired orientation of the nano-structures in the matrix, the microstructure can be tailored to obtain specific material properties. A novel surface image assisted modeling framework is proposed to understand functional properties of the graphene enhanced polymer. The effective thermal and mechanical responses are assessed based on computational homogenization. For the mechanical response, the 2-D nanoplatelets are modeled as internal interfaces that store energy for membrane actions. The effective thermal response is obtained similarly, where 2-D nanoplatelets are represented using regions of high conductivity. Using the homogenization simulation, macroscopic stiffness properties and thermal conductivity properties are modeled and then compared to the experimental data. The proposed surface image assisted modeling yields reasonable effective mechanical and thermal properties, where the Kapitza effect plays an important part in effective thermal properties.

High-performance polymer composites with enhanced mechanical and thermal properties from cyanate ester/benzoxazine resin and short Kevlar/glass hybrid fibers

2018 ◽  
Vol 31 (6) ◽  
pp. 719-732 ◽  
Author(s):  
Abdeldjalil Zegaoui ◽  
Mehdi Derradji ◽  
Abdul Qadeer Dayo ◽  
Aboubakr Medjahed ◽  
Hui-yan Zhang ◽  
...  
Keyword(s):  
Thermal Properties ◽  
High Performance ◽  
Hybrid Composites ◽  
Glass Fibers ◽  
Functional Materials ◽  
Polymeric Materials ◽  
Cyanate Ester ◽  
Resin Matrix ◽  
Mechanical And Thermal Properties ◽  
Hybrid Fibers

The investigation and design of new polymeric materials with an astonishing combination of properties are nowadays of great importance to facilitate the manufacturing process of high-quality products intended to be utilized in different applications and technical fields. For this intent, novel high-performance blend composites composed of the cyanate ester/benzoxazine resin blend reinforced by different proportions of silane-surface modified Kevlar and glass fibers were successfully fabricated by a compression molding technique and characterized by different experimental tests. The mechanical test results revealed that the bending and impact strength properties were considerably improved when increasing the amount of the hybrid fibers. The studied materials also presented excellent thermal stabilities as compared to the unfilled blend’s properties. With respect to the properties of the reinforcing systems, these improvements seen in either the mechanical or thermal properties could be due to the good dispersion as well as excellent adhesion of the reinforcing fibers inside the resin matrix, which were further evidenced by the Fourier transform infrared spectroscopy and scanning electron microscopy results. Consequently, the improved mechanical and thermal properties promote the use of the fabricated hybrid composites in domestic and industrial applications requiring functional materials with advanced properties for aerospace and military applications.

Mechanical and thermal properties of graphene nanosheets/magnesia composites

2017 ◽  
Vol 43 (13) ◽  
pp. 10377-10385 ◽  
Author(s):  
Cheng Chen ◽  
Limei Pan ◽  
Xiaoyun Li ◽  
Jingxian Zhang ◽  
Yongbao Feng ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Graphene Nanosheets ◽  
Mechanical And Thermal Properties

scholarly journals Synthesis and Mechanical Characterization of High Density Polyethylene/Graphene Nanocomposites

2018 ◽  
Vol 8 (2) ◽  
pp. 2814-2817 ◽  
Author(s):  
A. S. Alghamdi
Keyword(s):  
Tensile Strength ◽  
Thermal Properties ◽  
Elastic Modulus ◽  
High Density Polyethylene ◽  
Graphene Nanosheets ◽  
High Density ◽  
Mechanical And Thermal Properties ◽  
Micro Hardness ◽  
Polyethylene Matrix ◽  
Graphene Nanocomposites

The purpose of this work is to investigate the effects of graphene nanosheets (GNSs) addition on the mechanical and thermal properties of high density polyethylene (HDPE). The HDPE/Graphene nanocomposites were synthesized using solution blending approach. HDPE was incorporated with graphene nanosheets in a solvent at various weights of fractions (0.1, 0.2, 0.4 and 0.5 wt%), and then the micro-hardness, elastic modulus, tensile strength, strain at break and thermal properties of the nanocomposites were measured and compared. The results showed that the use of Xylene solvent at high temperature combined with mechanical stirring can fully dissolve HDPE pellets. Scanning electron microscope (SEM) showed that GNSs were homogenously dispersed in the polyethylene matrix at low weights of fractions. The addition of just 0.2 wt% GNSs resulted in 100% increase in the micro-hardness value. The elastic modulus and tensile strength properties are proportionally increased with increasing GNSs content up to 0.4 wt%. However, at higher weight of fraction, a reduction in these properties is observed. The crystallinity and strain at break properties are reduced with the addition of GNSs.

scholarly journals Multifunctional Hybrid Composites with Enhanced Mechanical and Thermal Properties Based on Polybenzoxazine and Chopped Kevlar/Carbon Hybrid Fibers

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1308 ◽  
Author(s):  
Hamid Ghouti ◽  
Abdeldjalil Zegaoui ◽  
Mehdi Derradji ◽  
Wan-an Cai ◽  
Jun Wang ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Carbon Fibers ◽  
High Performance ◽  
Bending Strength ◽  
Hybrid Composites ◽  
Polymeric Materials ◽  
Resin Matrix ◽  
Mechanical And Thermal Properties ◽  
Hybrid Fibers ◽  
Uniform Dispersion

This work studied the structural, morphological, mechanical, and thermal properties of newly designed polymeric materials using high-performance hybrid fibers to reinforce the polybenzoxazine resins. To achieve this goal, hybrid fibers consisting of chopped Kevlar and carbon fibers were subjected to a silane surface treatment, incorporated into the resin matrix in various combinations, and then isothermally cured using the compression molding technique. The mechanical performances of the prepared composites were scrutinized in terms of bending and tensile tests. By way of illustration, the composites holding 20 wt % Kevlar fibers and 20 wt % carbon fibers accomplished a bending strength and modulus of 237.35 MPa and 7.80 GPa, respectively. Additionally, the same composites recorded a tensile stress and toughness of 77 MPa and 0.27 MPa, respectively, indicating an increase of about 234% and 32.8% when compared to the pristine resin’s properties. The thermogravimetric analysis denoted an excellent thermal resistance of the reinforced hybrid composites. Fourier transform infrared spectroscopy proved that the functional groups of the as-used coupling agent were effectively grafted on the external surfaces of the reinforcing systems, and further confirmed that the chemical reaction took place between the treated fibers and the polybenzoxazine matrix, although the scanning electron microscope showed a uniform dispersion and interfacial adhesion of the fibers within the resin matrix. In fact, the incorporation of treated fibers along with their good dispersion/adhesion could explain the progressive enhancement in terms of thermal and mechanical properties that were observed in the hybrid composites.

Thermal conductivities, mechanical and thermal properties of graphite nanoplatelets/polyphenylene sulfide composites

RSC Advances ◽  
2014 ◽  
Vol 4 (42) ◽  
pp. 22101-22105 ◽  
Author(s):  
Junwei Gu ◽  
Junjie Du ◽  
Jing Dang ◽  
Wangchang Geng ◽  
Sihai Hu ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Ball Milling ◽  
Methanesulfonic Acid ◽  
Compression Molding ◽  
Polyphenylene Sulfide ◽  
Mechanical And Thermal Properties ◽  
Graphite Nanoplatelets ◽  
Molding Method ◽  
Mechanical Ball Milling ◽  
Thermal Conductivities

Functionalized pristine graphite nanoplatelets (fGNPs) by methanesulfonic acid/isopropyltrioleictitanate (MSA/NDZ-105) are used to fabricate fGNPs/polyphenylene sulfide (fGNPs/PPS) composites by mechanical ball milling followed by a compression molding method.

Sign in / Sign up

Export Citation Format

Share Document