scholarly journals Synergistical Performance Modification of Epoxy Resin by Nanofillers and Carboxyl-Terminated Liquid Nitrile–Butadiene Rubber

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4601
Author(s):  
Yuanjin Liu ◽  
Lixiao Yao ◽  
Yue Bu ◽  
Qing Sun
Keyword(s):  
Epoxy Resin ◽  
Resin Matrix ◽  
Relaxation Processes ◽  
Butadiene Rubber ◽  
Voltage Level ◽  
Nitrile Butadiene Rubber ◽  
Nano Alumina ◽  
The Matrix ◽  
Thermally Conductive ◽  
Relaxation Characteristics

Epoxy composite materials are widely used in power equipment. As the voltage level increases, the requirement of material properties, including electrical, thermal, and mechanical, has also increased. Introducing thermally conductive nanofiller to the epoxy/liquid rubber composites system is an effective approach to improve heat performance, but the effects of thermally conductive nanofillers on relaxation characteristics remain unclarified. In this paper, nano-alumina (nano-Al2O3) and nano-boron nitride (nano-BN) have been employed to modify the epoxy/carboxyl-terminated liquid nitrile–butadiene rubber (epoxy/CTBN) composites system. The thermal conductivity and glass transition temperature of different formula systems have been measured. The effect of the nanofillers on the relaxation behaviors of the resin matrix has been investigated. Results show that the different kinds of nanofillers will introduce different relaxation processes into the matrix and increase the conductivity at the same time. This study can provide a theoretical basis for the synergistic improvement of multiple properties of epoxy resin composites.

scholarly journals Assessing the Flexural Properties of Epoxy Composites with Extremely Low Addition of Cellulose Nanofiber Content

2020 ◽  
Vol 10 (3) ◽  
pp. 1159 ◽  
Author(s):  
Yingmei Xie ◽  
Hiroki Kurita ◽  
Ryugo Ishigami ◽  
Fumio Narita
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Flexural Modulus ◽  
Strengthening Mechanism ◽  
Short Fiber ◽  
Cellulose Nanofiber ◽  
Resin Matrix ◽  
Element Analysis ◽  
Epoxy Resin Matrix ◽  
The Matrix

Epoxy resins are a widely used common polymer due to their excellent mechanical properties. On the other hand, cellulose nanofiber (CNF) is one of the new generation of fibers, and recent test results show that CNF reinforced polymers have high mechanical properties. It has also been reported that an extremely low CNF addition increases the mechanical properties of the matrix resin. In this study, we prepared extremely-low CNF (~1 wt.%) reinforced epoxy resin matrix (epoxy-CNF) composites, and tried to understand the strengthening mechanism of the epoxy-CNF composite through the three-point flexural test, finite element analysis (FEA), and discussion based on organic chemistry. The flexural modulus and strength were significantly increased by the extremely low CNF addition (less than 0.2 wt.%), although the theories for short-fiber-reinforced composites cannot explain the strengthening mechanism of the epoxy-CNF composite. Hence, we propose the possibility that CNF behaves as an auxiliary agent to enhance the structure of the epoxy molecule, and not as a reinforcing fiber in the epoxy resin matrix.

Investigation of Fiber-Reinforced Modified Epoxy Resin Composites

2012 ◽  
Vol 510-511 ◽  
pp. 577-584 ◽  
Author(s):  
A. Quddos ◽  
Mohammad Bilal Khan ◽  
R.N. Khan ◽  
M.K.K. Ghauri
Keyword(s):  
Epoxy Resin ◽  
High Strength ◽  
Polymeric Matrix ◽  
Fiber Reinforced Composites ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Epoxy Resin Matrix ◽  
The Matrix ◽  
Modified Epoxy

The impregnation of the fiber with a resin system, the polymeric matrix with the interface needs to be properly cured so that the dimensional stability of the matrix and the composite is ensured. A modified epoxy resin matrix was obtained with a reactive toughening agent and anhydride as a curing agent. The mechanical properties of the modified epoxy matrix and its fiber reinforced composites were investigated systematically. The polymeric matrix possessed many good properties, including high strength, high elongation at break, low viscosity, long pot life at room temperature, and good water resistance. The special attentions are given to the matrix due to its low out gassing, low water absorption and radiation resistance. In addition, the fiber-reinforced composites showed a high strength conversion ratio of the fiber and good fatigue resistance. The dynamic and static of the composite material were studied by thermo gravimetric analysis (TGA), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) with EDX. The influences of processing technique such as curing and proper mixing on the mechanical and interfacial properties were determined. The results demonstrated that the modified epoxy resin matrix is very suitable for applications in products fabricated with fiber-reinforced composites.

Enhanced oil resistance and mechanical properties of nitrile butadiene rubber/lignin composites modified by epoxy resin

2015 ◽  
Vol 133 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Peng Yu ◽  
Hui He ◽  
Can Jiang ◽  
Yunchao Jia ◽  
Dongqing Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Butadiene Rubber ◽  
Oil Resistance ◽  
Nitrile Butadiene Rubber

Magneto-Electric Response and Functionality in Barium Ferrite/Barium Titanate/Epoxy Resin Nanocomposites

2017 ◽  
Vol 6 (1) ◽  
pp. 69-75 ◽  
Author(s):  
A. Kanapitsas ◽  
G. C. Psarras ◽  
C. Tsonos ◽  
Th. Speliotis ◽  
A. C. Patsidis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Barium Titanate ◽  
Epoxy Resin ◽  
Barium Ferrite ◽  
Interfacial Polarization ◽  
Hybrid Nanocomposites ◽  
Resin Matrix ◽  
Electric Response ◽  
Relaxation Processes ◽  
Barium Titanate Nanoparticles

Hybrid nanocomposites with barium ferrite and barium titanate nanoparticles embedded within an epoxy resin matrix, were prepared and studied, varying the fillers content. The morphology of the fabricated specimens was examined by means of scanning electron microscopy and energy dispersive X-ray spectroscopy. Dielectric and magnetic properties of the nanocomposites were investigated via broadband dielectric spectroscopy and magnetization tests, respectively. Fine dispersions of nanofillers were detected via electron microscopy in all studied cases. Dielectric permittivity increases with diminishing frequency and increasing temperature and filler content. Recorded relaxation processes are attributed to interfacial polarization, between matrix and nanoparticles, glass to rubber transition of the polymer matrix (α-relaxation), and re-arrangement of polar-side groups of the main polymer chain (β-relaxation). Magnetization and magnetic saturation increase with the amount of barium ferrite nanoparticles.

scholarly journals Preparation and Sound Insulation Performance of Superfine Metal Powder/Nitrile-Butadiene Rubber-Polyvinyl Chloride Microcellular Foaming Material

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Sheng Hu ◽  
Jun Cai ◽  
Guofeng Liao ◽  
Qiang Fu
Keyword(s):  
Metal Powder ◽  
Polyvinyl Chloride ◽  
Sound Insulation ◽  
Butadiene Rubber ◽  
Average Pore ◽  
Insulation Materials ◽  
Nitrile Butadiene Rubber ◽  
Microcellular Foaming ◽  
The Matrix ◽  
Insulation Performance

Lightweight sound insulation materials have received much attention. In this study, a series of superfine metal powder (SFM)/nitrile-butadiene rubber (NBR)-polyvinyl chloride (PVC) microcellular foaming materials were prepared with NBR-PVC as matrix and SFM as modifiers by employing the method of molding foaming. Analysis on the morphology of cross section, pore size, and pore distribution possessed by SFM/NBR-PVC was conducted by scanning electron microscopy (SEM), as well as the image processing software of Image-Pro. Then detailed discussion on the effect of SFM with different mass fractions in the matrix on the foaming quality was provided. In the meanwhile, the performance of sound insulation was tested by four-channel impedance tube system. The results show significant improvement for foaming quality and sound insulation performance of NBR-PVC microcellular foaming material through the addition of SFM. In comparison with the pure NBR-PVC materials, the microcellular foaming material exhibits the best performance of foaming quality and sound insulation when the SFM content in matrix is 30 wt%. It is shown that the average pore diameter and the foaming capacity decrease by 60% and 31%, respectively, while the surface density increases by 131%. In the meantime, the sound insulation index of SFM/NBR-PVC microcellular material increases by 7.2 dB to 30.5 dB, which conforms to the requirements of new lightweight sound insulation materials in modern time. Finally, the mechanism of the optimization conducted for sound insulation performance after the addition of SMF is explained.

scholarly journals Studi Eksperimental Performa Kampas Rem Serbuk Tebu dengan Menggunakan Motor Satria Fu 150

2018 ◽  
Vol 1 (2) ◽  
pp. 162-170
Author(s):  
Muhammad Sabri ◽  
Nofiqbal Annisa
Keyword(s):  
Friction Coefficient ◽  
Epoxy Resin ◽  
Sugar Cane ◽  
Fiber Material ◽  
Butadiene Rubber ◽  
Braking Performance ◽  
Brake Pads ◽  
Nitrile Butadiene Rubber ◽  
Braking Distance ◽  
Brake Lining

Kampas rem adalah suatu komponen rem yang paling penting dalam kinerja pengereman, kampas rem adalah suatu material komposit yang tersusun dari beberapa bahan penyusun dan pengikat. Kampas rem ada dua jenis yaitu Abestos yaitu 40 s/d 60%, resin 12% s/d 15%, BaSO4 14% s/d 15%, sisanya karet ban bekas, tembaga sisa kerajinan dan frictdust.dan kampas rem non asbestos yang terbuat dari aramyd atau Kevlar, rockwool, fiberglass, potasiumtitanate, carbonfiber, graphite, cellulose, vemiculate, steelfiber, BaSO4, resin phenolic, nitrile butadiene rubber. Pada penelitian ini peneliti membuat kampas rem non asbestos dari material serat tebu dengan variasi kompoisi 20% serat tebu, 15% MgO, 15% Al dan 25% resin epoxy 25% hardener.25% serat tebu, 15% MgO, 10% Al dan 25% resin epoxy 25% hardener.30% serat tebu, 15% MgO, 5% Al dan 25% resin epoxy 25% hardener. Tujuan dari penelitian ini untuk mendapatkan performa kampas rem menyerupai performa kampas rem non asbestos yang ada dipasaran seperti federal. Pengujian performa kampas rem yang diteliti berupa jarak pengereman, waktu pengereman, koefisien gesek kampas rem dengan disk break, dan pertambahan panas yang dihasilkan karena gesekan yang terjadi. Performa yang mendekati performa kampas rem merek federal dengan nilai jarak pengereman 17.28 m, waktu pengereman 1.94 s, panas yang dihasilkan 46.66667oC, dan koefisien gesek 0.812 pada kecepatan 60km/h dengan gaya tekan pedal rem sebesar 30N, dari standar performa jarak yang mendekati adalah komposisi C 17.45 m, Waktu pengereman komposisi C 1.98s. koefisien gesek komposisi C 0.804, dan panas komposisi C 48.6667oC. Brake lining is the most important brake component in braking performance. Brake lining is a composite material consists of several constituent materials and binders. There are two types of brake pads, namely Abestos 40% to 60%, resin 12% to 15%, BaSO4 14% to 15%, the rest are rubber tires, remaining copper craft and frictdust. While non asbestos brake shoes are made from aramyd or Kevlar, rockwool, fiberglass, potasiumtitanate, carbonfiber, graphite, cellulose, vemiculate, steelfiber, BaSO4, resin phenolic, and nitrile butadiene rubber. In this study, the researchers created non asbestos brake shoes from sugar cane fiber material with variation composition i.e. 20% sugar cane fiber, 15% MgO, 15% Al and 25% epoxy resin 25% hardener; 25% sugarcane fiber, 15% MgO, 10% Al and 25% epoxy resin 25% hardener; and 30% sugarcane fiber, 15% MgO, 5% Al and 25% epoxy resin 25% hardener. The purpose of this study is to obtain brake lining performance which resembling the performance of non-asbestos brake linings available in market such as federal brand. Brake lining performance were examined by testing the braking distance, braking time, brake pad friction coefficient with disk break, and the heat generated due to friction occurred. Performance which approaches the performance of federal brand brake shoes with a braking distance value of 17.28 m, braking time of 1.94 s, the heat generated was 46.66667 0C, and friction coefficient of 0.812 at a speed of 60 km/h with a brake pedal press force of 30 N, from similar standard performance distance was composition C 17.45 m, braking time composition C 1.98 s, friction coefficient composition C 0.804, and heat composition C 48.6667 0C.

Functionalization of AgNWs with amino groups and their application in an epoxy matrix for antistatic and thermally conductive nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (111) ◽  
pp. 91516-91523 ◽  
Author(s):  
Tengyun Zhao ◽  
Chen Zhang ◽  
Zhongjie Du ◽  
Hangquan Li ◽  
Wei Zou
Keyword(s):  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Resin Matrix ◽  
Amino Groups ◽  
Epoxy Nanocomposites ◽  
Epoxy Resin Matrix ◽  
Conductive Nanocomposites ◽  
Thermally Conductive

AgNWs were functionalized to improve their dispersion in an epoxy resin matrix, making AgNW–epoxy nanocomposites with high antistatic and thermal performances.

scholarly journals Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4128
Author(s):  
Chi Chen ◽  
Qing Sun ◽  
Chuang Wang ◽  
Yue Bu ◽  
Jiawei Zhang ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Epoxy Resin ◽  
Critical Factor ◽  
Interfacial Polarization ◽  
Nitrile Rubber ◽  
Dc Conductivity ◽  
Relaxation Processes ◽  
Liquid Rubber ◽  
Β Relaxation ◽  
Relaxation Characteristics

Utilizing liquid rubber to toughen epoxy resin is one of the most mature and promising methods. However, the dielectric relaxation characteristics of the epoxy/liquid rubber composites have not been studied systematically, while the relaxation behaviours are a critical factor for both micro and macro properties. In this paper, hydroxyl-terminated liquid nitrile rubber (HTBN) is employed to reinforce a kind of room-temperature-cured epoxy resin. The dielectric spectrum is measured and analysed. Results show that two relaxation processes are introduced in the binary composites. The α relaxation of HTBN shows a similar temperature dependence with the β relaxation of epoxy resin. The interfacial polarization leads to an increase of complex permittivity, which reaches its maximum at 70 °C. In addition, affected by interfacial polarization, the thermionic polarization is inhibited, and the samples with filler ratios of 15% and 25% show lower DC-conductivity below 150 °C. In addition, the α relaxation and thermionic polarization of epoxy resin obey the Vogel‒Fulcher‒Tammann law, while the interfacial polarization and DC-conductivity satisfy with the Arrhenius law. Furthermore, the fitting results of the Vogel temperature of α relaxation, glass transition temperature, apparent activation energy of interfacial polarization and DC-conductivity all decline with HTBN content. These results can provide a reference and theoretical guidance for the assessment of dielectric properties and the improvement of the formulation of liquid-rubber-toughened epoxy resin.

A facile route to fabricate thermally conductive and electrically insulating polymer composites with 3D interconnected graphene at an ultralow filler loading

Nanoscale ◽  
2019 ◽  
Vol 11 (32) ◽  
pp. 15234-15244 ◽  
Author(s):  
Shiqiang Song ◽  
Jinyuan Wang ◽  
Cheng Liu ◽  
Jincheng Wang ◽  
Yong Zhang
Keyword(s):  
Epoxy Resin ◽  
Polymer Composites ◽  
Filler Loading ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Conductive Composites ◽  
Thermally Conductive ◽  
Styrene Butadiene ◽  
Facile Route

A facile route has been developed to prepare highly thermally conductive composites including silicone, styrene–butadiene rubber and epoxy resin matrices.

scholarly journals Characterization of Dielectric Relaxation Process by Impedance Spectroscopy for Polymers: Nitrile Butadiene Rubber and Ethylene Propylene Diene Monomer

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Jae Kap Jung ◽  
Young Il Moon ◽  
Gyung Hyun Kim ◽  
Nae Hyung Tak
Keyword(s):  
Dispersion Analysis ◽  
Relaxation Processes ◽  
Segmental Motion ◽  
Butadiene Rubber ◽  
Ethylene Propylene Diene Monomer ◽  
Molecular Models ◽  
Temperature Dependent ◽  
Ethylene Propylene ◽  
Nitrile Butadiene Rubber

We invented a dispersion analysis program that analyzes the relaxation processes from dielectric permittivity based on a combination of the Havriliak–Negami and conductivity contribution functions. By applying the created program to polymers such as nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM), several relaxation processes were characterized: an α process due to segmental motions of the C-C bond, an α′ process attributed to fluctuations in the end-to-end dipole vector of the polymer chain, the conduction contribution by the filler observed above room temperature, and secondary relaxation processes β and γ of motion for the side group in NBR. In the EPDM specimen, the β process associated with the rotational motion of the side groups, the α process associated with the relaxation of local segmental motion, and the αβ process associated with the origin of the β process at high temperatures above 305 K were observed. The Maxwell–Wagner–Sillars effect and conduction contribution were also presented. The molecular chains responsible for the relaxation processes were assigned by building molecular models of the two polymers. The temperature dependence of the relaxation strength and the shape parameters that characterize the process were investigated. From the temperature-dependent relaxation analysis, the merged αβ process, activation energy, and glass transition temperature were determined and compared.

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