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Mechanical Properties of Polymers and Composites

TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
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Journal ArticleDOI
15 Jan 2014-Wear
TL;DR: In this article, Cenosphere and barium sulphate-based composites were used as major fillers for brake pads to improve wear resistance, enhanced recovery, lower disc temperature rise and reduced friction fluctuation.

34 citations

Journal ArticleDOI
01 Mar 2019
TL;DR: In this paper, the viscoelastic storage modulus of chitosan and citric acid were studied using dynamic mechanical analysis, and compared with neat and neutralized films to elucidate possible crosslinking with citric acids.
Abstract: Chitosan films containing citric acid were prepared using a multi-step process called heterogeneous crosslinking. These films were neutralized first, followed by citric acid addition, and then heat treated at 150 °C/0.5 h in order to potentially induce covalent crosslinking. The viscoelastic storage modulus, E′, and tanδ were studied using dynamic mechanical analysis, and compared with neat and neutralized films to elucidate possible crosslinking with citric acid. Films were also prepared with various concentrations of a model crosslinker, glutaraldehyde, both homogeneously and heterogeneously. Based on comparisons of neutralized films with films containing citric acid, and between citric acid films either heat treated or not heat treated, it appeared that the interaction between chitosan and citric acid remained ionic without covalent bond formation. No strong evidence of a glass transition from the tanδ plots was observable, with the possible exception of heterogeneously crosslinked glutaraldehyde films at temperatures above 200 °C.

34 citations


Cites background from "Mechanical Properties of Polymers a..."

  • ...Since polymers with a higher crystallinity typically display greater storage modulus [47], it might be possible that an increase in amorphous structure caused by citric acid had a counter balancing effect on the increase in rigidity from crosslinking, and thus the difference in E′ (195 ◦C) of neutralized and CA films was not statistically significant....

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  • ...Increasing crosslink density, or decreasing the average molecular weight between crosslinks, increases E′ in the rubbery-region of a material [47,48]....

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Journal ArticleDOI
TL;DR: In this paper, the authors reported on the preparation and characterization of absorbing electromagnetic (EM) nanocomposite shields based on polycarbonate (PC)/ polystyrene-co-acrylonitrile (SAN) 60/40 blend containing low contents of multi-walled carbon nanotubes (MWCNTs).

34 citations

Journal ArticleDOI
Jong-Pil Won1, Yi-Na Yoon1, Byung-Tak Hong1, Tei-Joon Choi1, Su-Jin Lee1 
TL;DR: In this paper, nano glass fibre-reinforced polymer (nano-GFRP) composite reinforcing bars (rebar) for concrete structures were fabricated, and their performance during prolonged exposure to water and alkaline solutions was evaluated.

34 citations

Journal ArticleDOI
TL;DR: In this article, a dynamic oscillatory analysis (frequency, time, temperature and strain sweeps) demonstrated that the two polymeric components form gelled phases with diverse viscoelastic properties.

34 citations