Mechanical Properties of Polymers and Composites

Landel, R. F.; Nielsen, Lawrence E.

doi:10.1201/b16929

Cited by 822 publications

(327 citation statements)

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“…In this work the Poisson's ratio ν of the matrix and the maximum packing fraction of the particles m were taken respectively equal to 0.5 (epoxy in the rubbery state) and to 0.601 (random loose packing, not agglomerated packing configuration) [25].…”

Section: Characterization Of Epoxy-magnetite Nanocompositesmentioning

confidence: 99%

Magnetite-epoxy nanocomposites obtained by the reactive suspension method: Microstructural, thermo-mechanical and magnetic properties

Barrera¹,

Sciancalepore

Messori

et al. 2017

European Polymer Journal

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Magnetite nanoparticles are prepared by non-hydrolytic sol-gel process in the presence of iron(III)-acetylacetonate as precursor and 2-ethyl-1,3-hexanediol as reactive solvent; the nanoparticle size is affected by the precursor-to-solvent ratio. The suspensions, mixed with bisphenol-A diglycidyl ether, are cured in the presence of ytterbium(III) trifluoromethanesulfonate as cationic initiator. The chain-growth polymerization results in a three-dimensional network where the diol, acting at the same time as reactive solvent and suspending medium, is covalently linked to the epoxy network according to the â\u80\u9cactivated monomerâ\u80\u9d mechanism. The filler induces stiffening because of hydrodynamic effects and of a better cross-linking ability in the nanocomposite. Magnetite nanoparticles form aggregates whose size and shape depend on concentration. Isothermal magnetization loops and FC/ZFC DC susceptibility curves indicate that all nanocomposites are dominated by interparticle magnetic interactions resulting in a collective response whose details depend on nanoparticle concentration and degree of aggregation

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Section: Characterization Of Epoxy-magnetite Nanocompositesmentioning

confidence: 99%

Magnetite-epoxy nanocomposites obtained by the reactive suspension method: Microstructural, thermo-mechanical and magnetic properties

Barrera¹,

Sciancalepore

Messori

et al. 2017

European Polymer Journal

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“…However, the neat epoxy has a better semicircular shape than the more asymmetric composites. It is worth observing that the 50GOCF/EM composite had the most distorted graph, which might indicate that both GO functionalization and amount of CF are related to more heterogeneous systems with impaired epoxy cross-linked bonding [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Dynamic Mechanical Behavior of Graphene Oxide Functionalized Curaua Fiber-Reinforced Epoxy Composites: A Brief Report

et al. 2021

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The coating of natural fiber by graphene oxide (GO) has, over, this past decade, attracted increasing attention as an effective way to improve the adhesion to polymer matrices and enhance the composite properties. In particular, the GO-functionalized 30 vol% curaua fiber (Ananas Erectifolius) reinforcing epoxy composite was found to display superior tensile and thermogravimetric properties as well as higher fiber/matrix interfacial shear strength. In this brief report, dynamic mechanical analysis (DMA) was conducted in up to 50 vol% GO-functionalized curaua fiber reinforced epoxy matrix (EM) composites. The objective was not only to extend the amount incorporated but also for the first time investigate the composite viscoelastic behavior. The GO functionalization of curaua fibers (GOCF) improved the DMA storage (E′) and loss (E″) modulus compared to the non-functionalized fiber composites. Values at 30 °C of both E′ (13.44 GPa) and E″ (0.67 GPa) for 50 vol% GO-functionalized curaua fiber reinforced epoxy matrix composites (50GOCF/EM) were substantially higher than those of 20 GOCF/EM with E′ (7.08 GPa) and E″ (0.22 GPa) as well as non-functionalized 50CF/EM with E′ (11.04 GPa) and E″ (0.45 GPa). All these results are above the neat epoxy previously reported values of E′ (3.86 GPa) and E″ (0.09 GPa). As for the tangent delta, the parameters associated with damping factor and glass transition temperature were not found to be significantly changed by GO functionalization, but decreased with respect to the neat epoxy due to chain mobility restriction.

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“…This slight change is probably caused by a better vulcanizate crosslinking process and not due to the influence of fibers. This seems to be because these fibers have a high melting point (180-270 C depending on the type), where the elastic state, preceding melting, is only 5 C, 26 so they are resistant to the temperature at which they were conditioned.…”

Section: Discussionmentioning

confidence: 99%

The effects of textile reinforcements on the protective properties of self-healing polymers intended for safety gloves

Irzmańska

Bacciarelli-Ulacha

Adamus-Włodarczyk

et al. 2020

Textile Research Journal

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In the environment where glove material is exposed to harmful chemicals, hazards related to faster penetration of dangerous substances into the glove interior may cause microdamage. One of the solutions to overcome this problem is to use the self-healing polymeric materials that can minimize economic loss and accidents in the workplace. The current work aims to present the impact of different types of textile reinforcement on the effectiveness and efficiency of the self-healing process of methyl vinyl silicone rubber containing hybrid molecules with an inorganic silsesquioxane intended for use on all-rubber gloves. Three knitted fabrics with a similar structure and differentiated raw material composition were selected: polyamide, cotton–polyamide, and cotton. Evaluation of the self-healing process of the elastomeric composite to personal protective equipment was performed. For this purpose the assessment of the surface morphology of materials has been performed before and after the self-healing process. The implementation of knitted fabric into the polymeric composite in the tested samples allowed us to obtain the best results in all tests. The studied composite samples exhibited an increased resistance to three types of damage: penetration, abrasion and puncture. The samples also underwent the self-healing processes and regeneration after a proper conditioning period. Thus, the obtained results confirmed the possibility of using tested elastomeric composites in the construction of protective gloves and showed an effectivity of the self-healing process for the long-term usage of that protective equipment.

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Mechanical Properties of Polymers and Composites

Cited by 822 publications

References 0 publications

Magnetite-epoxy nanocomposites obtained by the reactive suspension method: Microstructural, thermo-mechanical and magnetic properties

Magnetite-epoxy nanocomposites obtained by the reactive suspension method: Microstructural, thermo-mechanical and magnetic properties

Dynamic Mechanical Behavior of Graphene Oxide Functionalized Curaua Fiber-Reinforced Epoxy Composites: A Brief Report

The effects of textile reinforcements on the protective properties of self-healing polymers intended for safety gloves

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