Characterization of anisotropic moisture absorption in polymeric composites using hindered diffusion model

2012 ◽  
Vol 43 (8) ◽  
pp. 1187-1196 ◽  
Author(s):  
L.R. Grace ◽  
M.C. Altan
Keyword(s):  
Diffusion Model ◽  
Moisture Absorption ◽  
Polymeric Composites ◽  
Hindered Diffusion

scholarly journals Formulation Development and Performance Characterization of Ecological Dust Suppressant for Road Surfaces in Cities

2021 ◽  
Vol 11 (21) ◽  
pp. 10466
Author(s):  
Yuan Wang ◽  
Cuifeng Du ◽  
Mengmeng Cui
Keyword(s):  
Moisture Absorption ◽  
Environmentally Friendly ◽  
Road Dust ◽  
Raw Material ◽  
Retention Performance ◽  
Formulation Development ◽  
Performance Characterization ◽  
Material Sources ◽  
Road Surfaces

In order to solve the problem of road dust pollution, an ecological dust suppressant for road surfaces has been developed using monomer, orthogonal, and optimization experiments and based on the dust raising mechanism. A humectant, hygroscopic agent, coagulant and surfactant and their concentration ranges have been determined through monomer experiment. The preliminary formula of the dust suppressant has been obtained through orthogonal experiment, with the water loss rate, moisture content rate, viscosity value, and surface tension value serving as experimental indexes. The optimal formula for the dust suppressor has been calculated through an optimization experiment, with the toxicity, moisture absorption and retention performance of plants, and the relative damage rate of plant seeds serving as experimental indexes. Based on the performance characterization of ecological road dust suppressant, the ecologically and environmentally friendly dust suppressant demonstrates fine moisture absorption and retention performance, good wind and rain erosion resistance, and no toxicity. The ecological road dust suppressant developed herein covers extensive raw material sources. It is ecologically and environmentally friendly, fit for most urban roads, and has a fine dust suppression effect. Meanwhile, it also can bring in good economic and social benefits, demonstrating its broad application prospects.

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.

Preparation and Characterization of Cross-Linked Starch/Poly(vinyl alcohol) Green Films with Low Moisture Absorption

2010 ◽  
Vol 49 (5) ◽  
pp. 2176-2185 ◽  
Author(s):  
Kunal Das ◽  
Dipa Ray ◽  
N. R. Bandyopadhyay ◽  
Anirudhha Gupta ◽  
Suparna Sengupta ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Moisture Absorption ◽  
Poly Vinyl Alcohol

The Influence of Chromophores on the Magnitude of Space-Charge Fields in Photorefractive Polymeric Composites

2009 ◽  
Vol 62 (12) ◽  
pp. 1655 ◽  
Author(s):  
In Kyu Moon ◽  
Do Young Kim ◽  
Nakjoong Kim
Keyword(s):  
Space Charge ◽  
Molecular Orbital ◽  
Polymeric Composites ◽  
Space Charge Field ◽  
Operating Wavelength ◽  
Highest Occupied Molecular Orbital ◽  
Charge Field ◽  
Homo Level ◽  
Nlo Chromophores

This paper reports on the characterization of three poly(N-vinylcarbazole) (PVK)-based photorefractive composites with different non-linear optical (NLO) chromophores at an operating wavelength of 632.8 nm. The strength of the photoconductivity and the magnitude of the space-charge field (E SC) in the photorefractive composites are strongly affected by the chromophore’s highest occupied molecular orbital (HOMO). The magnitude of E SC increased with the lowering of the HOMO level of the NLO chromophores in the PVK composites.

Development and Characterization of Bismaleimides Containing Aliphatic Chain for Microelectronics Application

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
J. L. Feng ◽  
C. Y. Yue ◽  
K. S. Chian
Keyword(s):  
Chain Length ◽  
Moisture Absorption ◽  
Thermomechanical Analysis ◽  
Stress And Strain ◽  
Aliphatic Chain ◽  
Melting Points ◽  
Scanning Calorimetry ◽  
Backbone Chain ◽  
Gel Temperature

AbstractA series of bismaleimide systems containing aliphatic backbone chain have been synthesized and investigated. Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), Thermomechanical analysis (TMA), rheometry and tensile test were used to characterize the thermal and mechanical properties. It was noted that backbone chain length and odd-even effect affected properties. As the chain length increases, the curing peak temperature, gel temperature of BMI all increase, but the melting point, glass transition and moisture absorption decrease. The melting points of BMI-3,5,7 reduced most significantly. The tensile properties were affected by odd even effect significantly. BMI-3,5,7 with odd number of carbons have less stress and strain than those of even ones.

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