Effects of moisture absorption and surface modification using 3-aminopropyltriethoxysilane on the tensile and fracture characteristics of MWCNT/epoxy nanocomposites

2010 ◽  
Vol 256 (24) ◽  
pp. 7658-7667 ◽  
Author(s):  
Ji Hoon Lee ◽  
Kyong Yop Rhee ◽  
Joong Hee Lee
Keyword(s):  
Surface Modification ◽  
Moisture Absorption ◽  
Epoxy Nanocomposites ◽  
Fracture Characteristics

scholarly journals Moisture Absorption of Carbon/Epoxy Nanocomposites

2020 ◽  
Vol 4 (1) ◽  
pp. 21 ◽  
Author(s):  
Gorkem E. Guloglu ◽  
M. Cengiz Altan
Keyword(s):  
Carbon Nanomaterials ◽  
Moisture Absorption ◽  
Accurate Determination ◽  
Type Model ◽  
Graphite Nanoplatelets ◽  
Epoxy Nanocomposites ◽  
Thermal Environments ◽  
Thermogravimetric Data ◽  
Hindered Diffusion ◽  
Molecular Bonding

Moisture absorption of composites with nanoscale carbon additives such as carbon nanotubes, carbon nanofibers, graphite nanoplatelets, and carbon black is investigated using thermogravimetric data and a non-Fickian hindered diffusion (Langmuir-type) model. The moisture absorption parameters are determined using this model for six different types of carbon/epoxy nanocomposites. The absorption behaviors obtained at different humidity levels and thermal environments are recovered by minimizing the error between the experimental data and model predictions, thus enabling the accurate determination of the moisture equilibrium level. The absorption behavior and the weight gain of all nanocomposites are shown to be accurately represented by this model over the entire absorption period. The presence of carbon nanomaterials is found to induce varying levels of non-Fickian behavior, governed by the nondimensional hindrance coefficient. This behavior is enhanced with the nanomaterial content and separate from the slight non-Fickian behavior of all neat epoxy samples. The molecular bonding during diffusion, as well as the interfacial moisture storage, could be among the reasons for non-Fickian behavior and should be included in the absorption models for accurate characterization of carbon/epoxy nanocomposites.

Development of New Fire Extinguishing Agent for Grassland

2012 ◽  
Vol 550-553 ◽  
pp. 62-70 ◽  
Author(s):  
Ning Bo Leng ◽  
Shun Xi Wang ◽  
Pei Han
Keyword(s):  
Surface Modification ◽  
Calcium Carbonate ◽  
Absorption Rate ◽  
Moisture Absorption ◽  
Water Repellency ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Fire Extinguishing ◽  
Grassland Fire ◽  
Fire Characteristics

Selecting ammonium dihydrogen phosphate of ultra-fine processing and surface modification as the main agent of fire extinguishing agent, mica powder, activated clay, talc, calcium carbonate as an inert filler, ND1 as additive, developed specifically for the grassland fire characteristics of ultra-fine dry powder fire extinguishing agent grassland; tested the moisture absorption rate, water repellency, bulk density and fluidity and other technical indicators; using quadrat grassed ignition method on new grassland fire extinguishing agent research the fire extinguishing efficiency and cost.

Deformation and Fracture Characteristics of Cenosphere Filled Epoxies Under Compressive Loading Conditions

2001 ◽  
Author(s):  
Nikhil Gupta ◽  
Eyassu Woldesenbet
Keyword(s):  
Epoxy Resins ◽  
Fracture Behavior ◽  
Moisture Absorption ◽  
Compressive Loading ◽  
Polymeric Materials ◽  
Local Stress ◽  
Fracture Characteristics ◽  
Structured Materials ◽  
Deformation And Fracture

Abstract Close cell structured foams are made by incorporation of cenospheres in polymeric materials. Low moisture absorption characteristics and considerably higher compressive strength of these materials compared to open cell structured foams make them suitable for use as core materials in sandwich structured materials. Incorporation of cenospheres in the epoxy resins enhances their impact strength and damage tolerance, especially if these materials are used in sandwich configurations. Present study analyzes and compares the effect of incorporation of cenospheres like flyash and glass microballoons in the epoxy resins on the deformation and fracture behavior of the material. Approach based on determination of local stress intensity factors is used to obtain estimate of the stresses in the material.

Moisture Effect on Mechanical Properties of Graphene/Epoxy Nanocomposites

2016 ◽  
Vol 32 (6) ◽  
pp. 673-682 ◽  
Author(s):  
H.-K. Liu ◽  
Y.-C. Wang ◽  
T.-H. Huang
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Moisture Absorption ◽  
Graphene Nanosheets ◽  
Salt Water ◽  
Testing Machine ◽  
Weight Fraction ◽  
Epoxy Nanocomposites ◽  
Moisture Effect ◽  
Superior Mechanical Properties

Abstract2-D graphene nanosheets (GNS) not only have superior mechanical properties, but stacking of GNS in composites is expected to inhibit moisture absorption. In this paper, moisture effect on tensile strength of graphene/epoxy nanocomposites is investigated. Two kinds of graphene reinforcements are used including graphene oxide (GO) and reduced graphene oxide (RGO) with reinforcement weight fraction WGO or WRGO in the range of 0.5 to 3.0wt%. A dispersion agent acetone is added in nanocomposites to enhance graphene dispersion. To evaluate moisture influence, those nanocomposites are soaked in two kinds of liquid including deionized water (DIW) and salt water (saline solution) for seven kinds of soaking periods of time including 24, 48, 72, 100, 400 hours, 30 days, and 60 days. After soaking test, diffusion coefficients of various composites are evaluated; besides tensile strengths of composites are measured by microforce testing machine. In order to correlate the strength with microstructure evolution, several techniques are adopted to analyze morphologies and functionalities of reinforcements and fracture surface of composites. They include Raman spectroscope, X-ray photoelectron spectroscope, and SEM. 2-D GNS are found to effectively enhance nanocomposites by moisture attack, and their corresponding reinforcing mechanisms are proposed.

Structurization and moisture absorption features of epoxy nanocomposites with carbon nanotubes

2015 ◽  
Vol 6 (5) ◽  
pp. 515-520
Author(s):  
P. S. Marakhovskiy ◽  
S. V. Kondrashov ◽  
T. P. Dyachkova ◽  
Ya. M. Gurevich ◽  
I. A. Mayorova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Moisture Absorption ◽  
Epoxy Nanocomposites ◽  
Absorption Features

scholarly journals Effect of Hygrothermal Aging on the Mechanical Properties of Fluorinated and Nonfluorinated Clay-Epoxy Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Salah U. Hamim ◽  
Raman P. Singh
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Flexural Modulus ◽  
Epoxy Nanocomposites ◽  
Sem Images ◽  
Clay Particles ◽  
Hygrothermal Aging ◽  
Permanent Damage ◽  
Epoxy Polymers ◽  
Hydrophilic Nature

Hydrophilic nature of epoxy polymers can lead to both reversible and irreversible/permanent changes in epoxy upon moisture absorption. The permanent changes leading to the degradation of mechanical properties due to combined effect of moisture and elevated temperature on EPON 862, Nanomer I.28E, and Somasif MAE clay-epoxy nanocomposites are investigated in this study. The extent of permanent degradation on fracture and flexural properties due to the hygrothermal aging is determined by drying the epoxy and their clay-epoxy nanocomposites after moisture absorption. Significant permanent damage is observed for fracture toughness and flexural modulus, while the extent of permanent damage is less significant for flexural strength. It is also observed that permanent degradation in Somasif MAE clay-epoxy nanocomposites is higher compared to Nanomer I.28E clay-epoxy nanocomposites. Fourier transform infrared (FTIR) spectroscopy revealed that both clays retained their original chemical structure after the absorption-desorption cycle without undergoing significant changes. Scanning electron microscopy (SEM) images of the fracture surfaces provide evidence that Somasif MAE clay particles offered very little resistance to crack propagation in case of redried specimens when compared to Nanomer I.28E counterpart. The reason for the observed higher extent of permanent degradation in Somasif MAE clay-epoxy system has been attributed to the weakening of the filler-matrix interface.

scholarly journals Fatigue Fracture Characteristics of Ti6Al4V Subjected to Ultrasonic Nanocrystal Surface Modification

Metals ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 77 ◽  
Author(s):  
Xiaojian Cao ◽  
Luopeng Xu ◽  
Xiaoli Xu ◽  
Qingyuan Wang
Keyword(s):  
Surface Modification ◽  
Fatigue Fracture ◽  
Fracture Characteristics
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