scholarly journals Development and Analysis of the Physicochemical and Mechanical Properties of Diorite-Reinforced Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2421
Author(s):  
Amirbek Bekeshev ◽  
Anton Mostovoy ◽  
Yulia Kadykova ◽  
Marzhan Akhmetova ◽  
Lyazzat Tastanova ◽  
...  
Keyword(s):  
Gas Phase ◽  
Thermal Destruction ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Chemical Interaction ◽  
Strength Properties ◽  
Epoxy Composites ◽  
Mineral Filler ◽  
Pyrolysis Products ◽  
Thermal Stability Of

The aim of this paper is to study the effect of a polyfunctional modifier oligo (resorcinol phenyl phosphate) with terminal phenyl groups and a dispersed mineral filler, diorite, on the physicochemical and deformation-strength properties of epoxy-based composites. The efficiency of using diorite as an active filler of an epoxy polymer, ensuring an increase in strength and a change in the physicochemical properties of epoxy composites, has been proven. We selected the optimal content of diorite both as a structuring additive and as a filler in the composition of the epoxy composite (0.1 and 50 parts by mass), at which diorite reinforces the epoxy composite. It has been found that the addition of diorite into the epoxy composite results in an increase in the Vicat heat resistance from 132 to 140–188 °C and increases the thermal stability of the epoxy composite, which is observed in a shift of the initial destruction temperature to higher temperatures. Furthermore, during the thermal destruction of the composite, the yield of carbonized structures increases (from 54 to 70–77% of the mass), preventing the release of volatile pyrolysis products into the gas phase, which leads to a decrease in the flammability of the epoxy composite. The efficiency of the functionalization of the diorite surface with APTES has been proven, which ensures chemical interaction at the polymer matrix/filler interface and also prevents the aggregation of diorite particles, which, in general, provides an increase in the strength characteristics of epoxy-based composite materials by 10–48%.

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 Filler Nature on Chemical Resistance and Microhardness of Epoxy Composite Films

2015 ◽  
Vol 16 (3) ◽  
pp. 528-533
Author(s):  
G. Martinyuk ◽  
O. Aksimentyeva ◽  
N. Skoreiko ◽  
V. Zakordonskyi
Keyword(s):  
Mechanical Properties ◽  
Chemical Resistance ◽  
Filler Content ◽  
Epoxy Composite ◽  
Composite Films ◽  
Physical And Mechanical Properties ◽  
Epoxy Composites ◽  
Mineral Filler ◽  
Operating Characteristics ◽  
Mineral Fillers

We investigated the processes of water absorption, chemical stability and microhardness of films of epoxy composites that contained as the polymer matrix the epoxy resin UP-655 and mineral fillers: graphite, mica, aluminum oxide at their content (0 - 30 % mass). It found that introduction of mineral fillers significantly affects on all complex of operating characteristics of the films. Increase of filler content, especially mica, to 20 %, resulting in slower process and reducing the quantity of absorbed moisture by films. In the study of physical and mechanical properties of filled epoxy composites was established that the introduction of mineral filler significantly affects their microhardness, and the nature of the exposure is determined by the type and filler content.

Multi-Response Optimization in Drilling of Glass Epoxy Polymer Composites Using Simulated Annealing Approach

2013 ◽  
Vol 766 ◽  
pp. 123-141 ◽  
Author(s):  
S.R. Karnik ◽  
V.N. Gaitonde ◽  
S. Basavarajappa ◽  
J. Paulo Davim
Keyword(s):  
Surface Roughness ◽  
Simulated Annealing ◽  
Polymer Composites ◽  
Epoxy Polymer ◽  
Thrust Force ◽  
Epoxy Composite ◽  
Spindle Speed ◽  
Epoxy Composites ◽  
Machining Performance ◽  
Controllable Factors

The glass epoxy polymer composites are broadly used in various engineering fields because of outstanding properties. Even if, these composites are produced as near net shapes, the machining has to be carried out in the last stage of manufacture. Drilling is used to install the fasteners for assembly of laminates, but drilling of composites is somewhat complex task owing to exceedingly abrasive nature of reinforcement. Hence the choice of optimal process parameters is essential for successful machining performance. This paper illustrates the application of simulated annealing (SA) approach for simultaneous minimization of various machinability aspects such as thrust force, hole surface roughness and specific cutting coefficient during drilling of glass epoxy polymer composites. The experiments were performed as per full factorial design (FFD) for glass epoxy composites (without filler) and silicon carbide (SiC) filled glass epoxy composites materials. The mathematical models of proposed machinability characteristics were constructed using response surface methodology (RSM) with spindle speed and feed as controllable factors. The experimental investigation indicates that the SiC filled glass epoxy composite provides better machinability compared to glass epoxy composite without the addition of filler. The proposed machinability models were then utilized with SA to select the optimal parameters such as spindle speed and feed, which results in minimal thrust force, hole surface roughness and specific cutting coefficient.

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.

Comparative Tribological and Mechanical Property Analysis of Nano-Silica and Nano-Rubber Reinforced Epoxy Composites

2018 ◽  
Vol 875 ◽  
pp. 53-60 ◽  
Author(s):  
Abdulaziz Kurdi ◽  
Li Chang
Keyword(s):  
Friction And Wear ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Transfer Film ◽  
Epoxy Composites ◽  
Nano Silica ◽  
Different Types ◽  
Film Layer ◽  
Silica Addition ◽  
Pin On Disk

Nano-filler reinforced epoxy composites has been investigated in this study subjected to various mechanical and pin-on-disk tribological tests. Two different types of nano-filler were used namely, rigid nano-silica (SiO2) particles and soft nano-rubber particles. Incorporation of nano-filler in polymer matrix enhance mechanical properties. In addition, tribological response of composites are also better compared to neat epoxy polymer. However, the effect of nano-silica addition is much more pronounced than that of nano-rubber due to the high rigidity of nano-silica reinforced epoxy composite. This was mainly attributed to transfer film layer (TFL) formation. The TFL was further investigated by electron microscope and nanoindentor. The best set of tribological properties was achieved at 8 wt. % nano-silica addition. This was due to better reinforcement dispersion and continuous transfer film layer formation which eventually control the overall friction and wear mechanism.

Fabrication and properties of aligned multiwalled carbon nanotube-reinforced epoxy composites

2008 ◽  
Vol 23 (11) ◽  
pp. 2975-2983 ◽  
Author(s):  
Qunfeng Cheng ◽  
Jiaping Wang ◽  
Kaili Jiang ◽  
Qunqing Li ◽  
Shoushan Fan
Keyword(s):  
Carbon Nanotube ◽  
Epoxy Composite ◽  
Multiwalled Carbon Nanotube ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Pure Epoxy ◽  
Mechanical And Physical Properties ◽  
Cnt Arrays ◽  
Thermal Stability Of

A method to fabricate continuous and aligned multiwalled carbon nanotube (CNT)/epoxy composites is presented in this paper. CNT/epoxy composites were made by infiltrating an epoxy resin into a stack of continuous and aligned multiwalled CNT sheets that were drawn from super-aligned CNT arrays. By controlling the amount and alignment of the continuous multiwalled CNT sheets, a CNT/epoxy composite with high content of well-dispersed CNTs can be obtained. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results show that the thermal stability of these CNT/epoxy composites was not affected by the addition of CNTs. The mechanical properties and electrical properties of the CNT/epoxy composites were dramatically improved compared to pure epoxy, suggesting that the CNT/epoxy composites can serve as multifunctional materials with combined mechanical and physical properties.

High Temperature Clay Filled Epoxy Composites

2006 ◽  
Vol 977 ◽  
Author(s):  
Dharmaraj Raghavan ◽  
Joseph Ktoo Langat ◽  
Mauro Zammarano ◽  
Jeffrey Gilman
Keyword(s):  
Thermal Stability ◽  
Epoxy Composite ◽  
Decomposition Temperature ◽  
Primary Objective ◽  
Epoxy Composites ◽  
Modified Clay ◽  
Transmission Electron ◽  
Onset Decomposition Temperature ◽  
Filled Composite ◽  
Thermal Stability Of

AbstractThe primary objective of this study is to improve the thermal stability of clay and clay filled composite. An epoxy-clay composite has been prepared by dispersing 1-hexadecyl-3-(6-hydroxyhexyl)-2-methylimidazolium modified clay in an epoxy resin and cured with metaphenylene diamine (m-PDA) at 110.0 °C for 7 h and post cured at 140°C for 4 h. The thermal stability of the modified clay and clay filled epoxy composite was characterized via thermogravimetric analysis (TGA). The onset decomposition temperature of the imidazolium functionalized clay was 360°C. Transmission Electron Microscopy (TEM) of the composite showed mixed morphology with predominant fraction of intercalated clay platelets in the epoxy matrix. The onset decomposition temperature of the modified clay filled epoxy composite was found to be higher than that of pristine epoxy.

Thermooxidative Degradation of Composites Based on Epoxy Resin and Metal Nanopowders

2019 ◽  
Vol 942 ◽  
pp. 11-20
Author(s):  
Dmitry Lipchansky ◽  
Olga B. Nazarenko
Keyword(s):  
Thermal Stability ◽  
Boric Acid ◽  
Epoxy Resin ◽  
Epoxy Composite ◽  
Electrical Explosion ◽  
Epoxy Composites ◽  
Thermooxidative Degradation ◽  
Air Atmosphere ◽  
Metal Nanopowders ◽  
Thermal Stability Of

The thermooxidative degradation behavior of the epoxy composites filled with metal nanopowders has been investigated by thermogravimetric analysis under nonisothermal conditions in air atmosphere. The mechanical characteristics of epoxy composites were also studied by three-point bending method. The comparison of two different types of metal nanopowder was made. Aluminum and copper nanopowders prepared by electrical explosion of wires were used as fillers separately as well as in combination with conventional fame-retardant boric acid. It was shown that aluminum nanopowder increased slightly thermal stability of the epoxy composites. On the contrary, the introduction of copper nanopowder in epoxy resin led to rapid degradation of the epoxy composite. The combination of metal nanopowders and boric acid improved thermal stability of the epoxy composites. The highest flexural properties showed the epoxy composite filled with copper nanopowder.

Processing of high weight fraction banana fiber reinforced epoxy composites using pressure induced dip casting method

2021 ◽  
pp. 002199832098804
Author(s):  
TP Mohan ◽  
K Kanny
Keyword(s):  
Matrix Composite ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Matrix Material ◽  
Natural Fibers ◽  
Weight Fraction ◽  
Polymer Composite Material ◽  
Fiber Reinforced ◽  
Banana Fiber ◽  
Banana Fibers

The objective of this work is to realize new polymer composite material containing high amount of natural fibers as a bio-based reinforcement phase. Short banana fiber is chosen as a reinforcement material and epoxy polymer as a matrix material. About 77 wt.% of banana fibers were reinforced in the epoxy polymer matrix composite, using pressure induced fiber dipping method. Nanoclay particles were infused into the banana fibers to improve the fiber matrix interface properties. The nanoclay infused banana fiber were used to reinforce epoxy composite and its properties were compared with untreated banana fiber reinforced epoxy composite and banana fiber reinforced epoxy filled with nanoclay matrix composite. The surface characteristics of these composites were examined by electron microscope and the result shows well dispersed fibers in epoxy matrix. Thermal (thermogravimetry analysis and dynamic mechanical analysis), mechanical (tensile and fiber pullout) and water barrier properties of these composites were examined and the result showed that the nanoclay infused banana fiber reinforced epoxy composite shows better and improved properties. Improved surface finish composite was also obtained by this processing technique.

Preparation and Pyrolysis of Stereoisomeric Bromobicyclo[n.1.0]alkanes ( n = 6, 8 , 10)

1987 ◽  
Vol 42 (4) ◽  
pp. 489-494 ◽  
Author(s):  
Eckehard V. Dehmlow ◽  
Roland Kramer
Keyword(s):  
Thermal Stability ◽  
Gas Phase ◽  
Condensed Phase ◽  
Secondary Products ◽  
Gas Phase Reactions ◽  
Stereoselective Reduction ◽  
Derivatives Of ◽  
Thermal Stability Of

Abstract The title compounds la-3c were prepared by stereoselective reduction of the respective dibromides. Pyrolysis gave allylic bromides (8, 9, 11) as primary and dienes (10, 12) as secondary products. Product ratios were independent of the stereochemistry of the starting materials. No differences of the rearrangement rates of the stereoisomers were observed in gas phase reactions of the derivatives of bicyclo[6.1.0]- and bicyclo[8.1.0]alkanes. With the larger bicyclo[10.1.0] derivatives, however, distinct differences in the thermal stability of cis-trans-isomers4c/5c or 2c/3c were found in condensed phase.

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