Aerogel: a potential three-dimensional nanoporous filler for resins

2011 ◽  
Vol 30 (11) ◽  
pp. 912-921 ◽  
Author(s):  
Ai Du ◽  
Bin Zhou ◽  
Yunong Li ◽  
Xiuyan Li ◽  
Junjian Ye ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Silica Aerogel ◽  
Glassy State ◽  
Three Dimensional ◽  
Epoxy Composites ◽  
Interfacial Effect ◽  
Mechanical Behaviors ◽  
Dynamic Mechanical Analyzer ◽  
Pure Epoxy ◽  
Pure Silica

Considering its special microstructure and unique properties, silica aerogel was chosen as three-dimensional (3D) nanoporous filler for epoxy resin in this paper. Pure epoxy resin (0 wt%), 0.1 wt%, 1 wt%, 5 wt%, 10 wt%, and 100 wt% (pure silica aerogel) aerogel/epoxy composites were fabricated and then characterized by dynamic mechanical analyzer (DMA) and field emission scanning electron microscope. The results showed that small amount of filler efficiently increased the stiffness of the composites, but the stiffness decreased with the increase of the mass fraction of the aerogel in the composites (composites ratio); the glass transition temperature of the composites substantially increased, compared to pure epoxy resin. Also, the compressive modulus of the composites at glassy state, rubbery state, and hardening state were studied, respectively. At last, the effects which presumably affect the properties of aerogel/epoxy composites were discussed. Anchoring effect and interfacial effect were suggested to explain the thermal—mechanical behaviors of the composites with different composite ratio.

Study on Electron Beam Curing of APTES Functionalized MWNTs/ Epoxy Composites

2011 ◽  
Vol 194-196 ◽  
pp. 1607-1610
Author(s):  
Yan Yan Lu ◽  
Hua Li ◽  
He Zhou Liu
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Epoxy Resin ◽  
Conversion Rate ◽  
Epoxy Composites ◽  
Pure Epoxy ◽  
Gel Content ◽  
Electron Beam Curing ◽  
Irradiation Process

In this study, we prepared the 3-aminopropyltriethoxysilane (APTES) functionalized MWNTs/epoxy composites by electron beam (EB) irradiation process. The modified MWNTs were characterized with SEM-EDS and FTIR. The gel content and conversion rate of epoxide groups of the EB cured pure epoxy resin and the APTES functionalized MWNTs/epoxy composites were measured and discussed. And the mechanical properties of the EB cured composites were also characterized. With addition of 0.25wt% APTES functionalized MWNTs, the Vicker’s hardness of the EB cured composite increased 100.02% compared with pure epoxy.

Effects of Weave Type and Fiber Content on Physical Properties of Sisal Fiber/Epoxy Composites

2010 ◽  
Vol 123-125 ◽  
pp. 1139-1142 ◽  
Author(s):  
Sawitri Srisuwan ◽  
Pranee Chumsamrong
Keyword(s):  
Impact Strength ◽  
Physical Properties ◽  
Epoxy Resin ◽  
Flexural Modulus ◽  
Fiber Content ◽  
Epoxy Composites ◽  
Sisal Fiber ◽  
Pure Epoxy ◽  
Sisal Fibers ◽  
The Impact

In this study, the effects of weave type and fiber content on the physical properties of woven sisal fiber/epoxy composites were investigated. Sisal fibers used in this work were obtained from Nakhon Ratchasima, Thailand. Both untreated and alkali-treated fibers were employed. The woven sisal fibers were manufactured by hand weaving process. The fiber content in sisal fiber/epoxy composites were 3 wt.%, 5 wt.% and 10 wt.%. The composites were cured at room temperatures. In order to determine mechanical properties of the composites, flexural and impact tests were applied. Flexural strength and flexural modulus of all composites were higher than those of pure epoxy resin and tended to increase with increasing fiber content. The impact strength of all composites was lower than that of pure epoxy resin. The composites containing 10 wt.% sisal fibers showed the highest impact strength. There was no definite influence of weave type on flexural properties of the composites. At 3 and 5 wt.% fiber, the composites containing plain weave fibers seemed to show a higher impact strength than the composites containing other weave types.

scholarly journals MECHANICAL BEHAVIORS OF BANANA AND SISAL HYBRID COMPOSITES REINFORCED WITH EPOXY RESIN

2016 ◽  
Vol 4 (1) ◽  
pp. 206-216
Author(s):  
Hemant Patel ◽  
Ashish Parkhe ◽  
P.K. Shrama
Keyword(s):  
Epoxy Resin ◽  
Renewable Resources ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Inorganic Materials ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Mechanical Behaviors ◽  
Paper Test ◽  
Compressive Tests

Natural fibers have been used to reinforce materials for over 200 years. The aim of this study is to evaluate mechanical properties such as tensile and flexural properties of hybrid banana and sisal reinforced epoxy composites they have been employed in combination with plastics. Natural fibers like as hemp, jute, sisal and banana. It’s have the advantage that they are renewable resources and have marketing appeal these agricultural wastes can be used to prepare fiber The composites have many advantages over traditional glass fiber and inorganic materials. In this paper, test are conducted for composite material constitutes banana and less discovered sisal  These composites are adhered using epoxy resin consists resin and hardener suitably mixed in appropriate volume Here for preparing samples Hand layup method is used , specimens are prepared and tests are carried out , which shows tensile and bending strengths. The tensile & compressive tests were applied on specimens of 300×50×10 mm in dimensions but in different proportions of banana and sisal by weight.

Electron Beam Curing of Epoxide Modified MWNTs/Epoxy Composites

2011 ◽  
Vol 688 ◽  
pp. 69-73
Author(s):  
Yan Yan Lu ◽  
Hua Li ◽  
He Zhou Liu
Keyword(s):  
Carbon Nanotubes ◽  
Electron Beam ◽  
Epoxy Resin ◽  
Stress Reduction ◽  
Polymer Matrix Composites ◽  
Epoxy Composites ◽  
Matrix Composites ◽  
Pure Epoxy ◽  
Gel Content ◽  
Hazardous Chemical

Electron beam (EB) has been used in curing of polymers in view of its advantages over conventional curing processes including short curing time, lower thermal stress, reduction of hazardous chemical volatiles, higher production flexibility. Carbon nanotubes have been recognized as promising filler that can be used to change the mechanical, thermal and electrical properties of the polymer matrix composites. In this paper, EB curing of epoxide modified multi-walled carbon nanotubes (MWNTs)/epoxy composite has been investigated, and a bisphenol-A epoxy resin was used as matrix. MWNTs were chemical functionalized with epoxide monomer and the epoxide functionalized MWNTs were characterized by TG and FTIR. The gel content and Vicker’s hardness of the EB cured pure epoxy resin and the epoxide functionalized MWNTs/epoxy composites were measured and discussed as function of the concentration of the functionalized MWNTs. With the addition of epoxide modified MWNTs, both the gel content and Vicker’s hardness of the composites showed enhancement compared with EB cured pure epoxy.

Toughening Mechanism and the Application of Epoxy Adhesive Modified by Nano-SiO2

2012 ◽  
Vol 174-177 ◽  
pp. 834-837
Author(s):  
Xi Wang ◽  
S. R. Zheng ◽  
R. M. Wang
Keyword(s):  
Impact Strength ◽  
Epoxy Resin ◽  
Three Dimensional ◽  
Epoxy Adhesive ◽  
Toughening Mechanism ◽  
Pure Epoxy ◽  
Dimensional Network ◽  
Shearing Strength ◽  
System Resilience ◽  
Unmodified Epoxy

Epoxy resin adhesives are widely used in various sectors, particularly in the aerospace and automotive industries. However, the solidification of the three-dimensional network structure of pure epoxy resin, which causes greater density and brittleness, results in poor system resilience. With the ultimate goal of improving the resilience of epoxy resin, nano-sized SiO2particles were introduced to improve the adhesion strength of both modified and unmodified epoxy adhesive. The results indicated increases of shearing strength from 16.66-Mpa to 18.01 -Mpa, impact strength from 15.4-kJ/m2 to 33.68-kJ/m2, and flexural strength from 70.5-Mpa to 80.94 Mpa.

An isotropic elasto-damage-plastic micromechanical framework of innovative pothole patching materials featuring high-toughness, low-viscosity nanomolecular resin

2021 ◽  
pp. 105678952110286
Author(s):  
H Zhang ◽  
J Woody Ju ◽  
WL Zhu ◽  
KY Yuan
Keyword(s):  
Strain Energy ◽  
Three Dimensional ◽  
Elastic Strain Energy ◽  
Companion Paper ◽  
Computational Algorithms ◽  
Mechanical Behaviors ◽  
High Toughness ◽  
Low Viscosity ◽  
Innovative Materials ◽  
Continuum Thermodynamic

In a recent companion paper, a three-dimensional isotropic elastic micromechanical framework was developed to predict the mechanical behaviors of the innovative asphalt patching materials reinforced with a high-toughness, low-viscosity nanomolecular resin, dicyclopentadiene (DCPD), under the splitting tension test (ASTM D6931). By taking advantage of the previously proposed isotropic elastic-damage framework and considering the plastic behaviors of asphalt mastic, a class of elasto-damage-plastic model, based on a continuum thermodynamic framework, is proposed within an initial elastic strain energy-based formulation to predict the behaviors of the innovative materials more accurately. Specifically, the governing damage evolution is characterized through the effective stress concept in conjunction with the hypothesis of strain equivalence; the plastic flow is introduced by means of an additive split of the stress tensor. Corresponding computational algorithms are implemented into three-dimensional finite elements numerical simulations, and the outcomes are systemically compared with suitably designed experimental results.

scholarly journals Enhanced flexural properties of aramid fiber/epoxy composites by graphene oxide

2019 ◽  
Vol 8 (1) ◽  
pp. 484-492 ◽  
Author(s):  
Yinqiu Wu ◽  
Bolin Tang ◽  
Kun Liu ◽  
Xiaoling Zeng ◽  
Jingjing Lu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexural Strength ◽  
Interfacial Shear Strength ◽  
Flexural Modulus ◽  
Weight Fraction ◽  
Interfacial Shear ◽  
Aramid Fiber ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Pure Epoxy

Abstract The reinforcing effect of graphene oxide (GO) in enhancing the flexural strength and flexural modulus of aramid fiber (AF)/epoxy composites were investigated with GO-AFs at a weight fraction of 0.1-0.7%. The flexural strength and flexural modulus of the composite reached 87.16 MPa and 1054.7 MPa, respectively, which were about 21.19% and 40.86% higher than those of the pure epoxy resin, respectively. In addition, the flexural properties and interfacial shear strength (IFSS) of composite reinforced by GO-AFs were much higher than the composites reinforced by AFs due to GO improved the interfacial bonding between the reinforcement material and matrix.

scholarly journals Effect of rice husk (treated/untreated) and rice husk ash on fracture toughness of epoxy bio-composite

2020 ◽  
Vol 29 (1) ◽  
pp. 177-185
Author(s):  
Neeraj Bisht ◽  
Prakash Chandra Gope
Keyword(s):  
Fracture Toughness ◽  
Epoxy Resin ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Matrix Material ◽  
Secondary Reinforcement ◽  
Filler Loading ◽  
Particle Reinforcement ◽  
Pure Epoxy ◽  
Fibre Treatment

AbstractPresent work studies the effect of particle reinforcement on fracture toughness of bio-composites. The filler used has been taken as rice husk. Epoxy resin has been taken as matrix material. Composites with varying filler loading of 10, 20, 30 and 40 wt.% were fabricated. The fracture toughness was seen to be increasing with increase in filler loading. However beyond 20% there was a decrease in fracture toughness with increase in filler loading. The effect of fibre treatment on toughness was also observed. Rice husk fibres pre-treated with NaOH were used. It was observed that fracture toughness further improved due to treatment. The increase in fracture toughness was significant. Fracture toughness increased from 1.072 to 2.7465 MPa√mm for 20% reinforcement and after treatment it increased to 2.876 MPa√mm. It was observed that concentration of treatment media also affects the fracture toughness. Further the effect of hybridization was observed by addition of rice husk ash as a secondary reinforcement. The fracture toughness of the resulting composites was remarkably higher than that of pure epoxy.

Studies on Thermal Property of Silica Aerogel/Epoxy Composite

2007 ◽  
Vol 546-549 ◽  
pp. 1581-1584 ◽  
Author(s):  
Jiu Peng Zhao ◽  
Deng Teng Ge ◽  
Sai Lei Zhang ◽  
Xi Long Wei
Keyword(s):  
Thermal Conductivity ◽  
Thermal Property ◽  
Epoxy Resin ◽  
Silica Aerogel ◽  
Epoxy Composite ◽  
Transfer Model ◽  
Insulation Material ◽  
Thermal Transfer ◽  
Heat Distortion Temperature ◽  
Ft Ir

Silica aerogel/epoxy composite, a kind of efficient thermal insulation material, was prepared by doping silica aerogel of different sizes into epoxy resin through thermocuring process. The results of thermal experiments showed that silica aerogel/epoxy composite had a lower thermal conductivity (0.105W/(m·k) at 60 wt% silica aerogel) and higher serviceability temperature (Martens heat distortion temperature: 160°C at 20 wt% silica aerogel). In addition, the composite doping larger size (0.2-2mm) of silica aerogel particle had lower thermal conductivity and higher Martens heat distortion temperature. Based on the results of SEM and FT-IR, the thermal transfer model was established. Thermal transfer mechanism and the reasons of higher Martens heat distortion temperature have been discussed respectively.

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