scholarly journals Effect of Heat Assisted Bath Sonication on the Mechanical and Thermal Deformation Behaviours of Graphene Nanoplatelets Filled Epoxy Polymer Composites

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Jin-Luen Phua ◽  
Pei-Leng Teh ◽  
Supri Abdul Ghani ◽  
Cheow-Keat Yeoh
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Deformation ◽  
Epoxy Polymer ◽  
Deformation Behaviour ◽  
Filler Loading ◽  
Graphene Nanoplatelets ◽  
Epoxy Composites ◽  
Bulk Electrical Conductivity ◽  
Thermal Stability Of

Graphene nanoplatelets (GNP) filled epoxy composites ranged from 0.2 to 5 vol.% were prepared in this study using simple heat assisted bath sonication for better GNP dispersion and exfoliation. The effects of GNP filler loading via heat assisted bath sonication on the mechanical properties and thermal deformation behaviour were investigated. Improvements on flexural strength and fracture toughness up to 0.4 vol.% filler loading were recorded. Further addition of GNP filler loading shows a deteriorating behaviour on the mechanical properties on the composites. The bulk electrical conductivity of the epoxy composites is greatly improved with the addition of GNP filler loading up to 1 vol.%. The thermal expansion of epoxy composites is reduced with the addition of GNP; however poor thermal stability of the composites is observed.

MECHANICAL PROPERTIES OF BAMBOO POWDER REINFORCED ETHYLENE PROPYLENE DIENE MONOMER (EPDM) COMPOSITES: EFFECT OF FILLER LOADING AND PARTICLE SIZE

2014 ◽  
Vol 6 (2) ◽  
pp. 1122-1134 ◽  
Author(s):  
Mokhtar Hemdan Abd El-Salam
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Particle Size ◽  
Internal Friction ◽  
Thermo Gravimetric Analysis ◽  
Filler Loading ◽  
Gravimetric Analysis ◽  
Wide Range ◽  
Bamboo Powder ◽  
Thermal Stability Of

Due to the light weight, high specific strength and non hazardous nature of bamboo fiber, it is preferred over synthetic fibers in composite materials for a wide range of applications such as automotive industry and including household sectors. As was noticed, little attention has been given to the effect of bamboo powder on the mechanical properties of rubber composites. Hence, an attempt has been made in this paper to the study the effect of loading and particle size of bamboo powder on the mechanical properties of EPDM composites. Thermo-gravimetric analysis (TGA) was carried out to study the thermal stability of composites. Results indicated that the thermal stability of EPDM was further improved with increasing in bamboo loading and decreasing in particle size. The stress- strain curves of the composites were studied and fitted according toOgden’s model. Mechanical parameters for the studied composites were improved with increasing bamboo loading. Besides, properties such as rupture stress, and internal friction were found to be maximum for composites containing certain content of bamboo powder, depending upon its particle size. Moreover, composites containing the smallest particle size of powder, at all levels of bamboo loading, showed mechanical properties superior to all other composites. From the dynamic mechanical measurements, the dynamic modulus, internal friction, and thermal diffusivity were calculated. The observed variations were explained in view of the role played by both the loading level and the particle size of bamboo powder. These findings were supported by scanning electron microscopy (SEM) micrographs.

scholarly journals composite plastics with microdispersions of SiC, TiN and cement

2019 ◽  
pp. 40-43
Author(s):  
D. L. Staroadomskyk
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Nitric Acid ◽  
Abrasion Resistance ◽  
Epoxy Polymer ◽  
Chemical Resistance ◽  
Strength Properties ◽  
Epoxy Composites ◽  
Bending Modulus ◽  
Thermal Stability Of

New data on the eff ect of a SiC and TiN fi llers on the practically important properties of epoxy polymer are presented. The possibilities for a signifi cant increase in microhardness – 1.5–2 times, bending modulus (1.4–1.7 times), compressive strength (for SiC), abrasion resistance and chemical resistance (in nitric acid and acetone/ethyl acetate) are established. At the same time, the thermal stability of the compositions and their strength properties is substantially increased. This is manifested in the eff ects of strengthening (compared with the unfi lled analogue) and plasticization of such composites after temperatures that destroy the ordinary polyepoxides (200–300°C. These eff ects are not covered in the literature and are named by the author as “eff ects of thermal strengthening and thermoplasticization of epoxy composites”.

scholarly journals Effect of Morphology of Calcium Carbonate on Toughness Behavior and Thermal Stability of Epoxy-Based Composites

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 178 ◽  
Author(s):  
Guijun Yang ◽  
Young-Jung Heo ◽  
Soo-Jin Park
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Fracture Toughness ◽  
Filler Content ◽  
Flexural Modulus ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Caco3 Nanoparticles ◽  
Degradation Temperature ◽  
Thermal Stability Of

In this study, the modification of an epoxy matrix with different amounts of cube-like and rod-like CaCO3 nanoparticles was investigated. The effects of variations in the morphology of CaCO3 on the mechanical properties and thermal stability of the CaCO3/epoxy composites were studied. The rod-like CaCO3/epoxy composites (EP-rod) showed a higher degradation temperature (4.5 °C) than neat epoxy. The results showed that the mechanical properties, such as the flexural strength, flexural modulus, and fracture toughness of the epoxy composites with CaCO3 were enhanced by the addition of cube-like and rod-like CaCO3 nanoparticles. Moreover, the mechanical properties of the composites were enhanced by increasing the amount of CaCO3 added but decreased when the filler content reached 2%. The fracture toughness Kic and fracture energy release rate Gic of cube-like and rod-like CaCO3/epoxy composites (0.85/0.74 MPa m1/2 and 318.7/229.5 J m−2, respectively) is higher than the neat epoxy (0.52 MPa m1/2 and 120.48 J m−2).

Influence of Graphene Nanoplatelets on Silica-Filled Natural Rubber Composites: Dispersion Mixing and Effect on Thermal Stability, Rheological and Mechanical Properties

2019 ◽  
Vol 943 ◽  
pp. 100-104 ◽  
Author(s):  
Methus Charoenchai ◽  
Siree Tangbunsuk ◽  
Wirunya Keawwattana
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Natural Rubber ◽  
Graphene Nanoplatelets ◽  
Cure Rate ◽  
Rubber Composites ◽  
Natural Rubber Composites ◽  
Cure Time ◽  
Vulcanization Process ◽  
Thermal Stability Of

In this study, graphene nanoplatelets C750 (GnPs-C750) was introduced to silica-filled natural rubber composites (NR/SiO2/GnPs) by simple latex mixing process and coagulation following conventional vulcanization process to investigate the outstanding properties compared to individuals. The SiO2 and GnPs contents were fixed at 40 and 2 parts per hundred of rubber (phr), respectively. The results showed that in the presence of GnPs in SiO2-filled natural rubber composites, the thermal stability of the composite was improved. Meanwhile, the rheological properties including minimum torque and maximum torque were increased and cure characteristics including scorch time and optimum cure time were decreased related to cure rate index was greater than SiO2 individual. The influence of GnPs on the mechanical properties was investigated. The results showed that it was not significantly changed in mechanical properties.

scholarly journals High modulus polyimide particle-reinforcement of epoxy composites

2021 ◽  
Author(s):  
Johannes Essmeister ◽  
M. Josef Taublaender ◽  
Thomas Koch ◽  
D. Alonso Cerrón-Infantes ◽  
Miriam M. Unterlass ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Composite Materials ◽  
Epoxy Matrix ◽  
Epoxy Composites ◽  
High Modulus ◽  
Particle Reinforcement

A novel class of fully organic composite materials with well-balanced mechanical properties and improved thermal stability was developed by incorporating highly crystalline, hydrothermally synthesized polyimide microparticles into an epoxy matrix.

scholarly journals Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2903
Author(s):  
Juvenal Giogetti Nemaleu Deutou ◽  
Rodrigue Cyriaque Kaze ◽  
Elie Kamseu ◽  
Vincenzo M. Sglavo
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Strength ◽  
Treatment Temperature ◽  
Strength Development ◽  
Particle Sizes ◽  
Cold Setting ◽  
Thermal Stability Of ◽  
Geopolymer Composites ◽  
Refractory Composites

The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

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