Elastomeric nanocomposite foams with improved properties for extreme conditions

Bizhani, Hasti; Katbab, Ali Asghar; Verdejo, Raquel

doi:10.1016/b978-0-12-816198-2.00006-2

Cited by 8 publications

(7 citation statements)

References 48 publications

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“…Silicone (polyorganosiloxane) consists of alternating silicon and oxygen atoms (siloxane units) with hydrocarbon side radicals combined directly with silicon [ 129 , 130 , 131 ]. The characteristics of the Si-O-Si bond, large bond length (0.163 nm), bond angle (130°) and bond energy (445 kJ/mol) provide SR with superior performance properties including excellent chemical resistance, good electrical insulation capacity, high elasticity, excellent thermal, ultraviolet and ozone stability, high weathering resistance and very low glass transition temperature (T g ≈ −120 °C), as well as biocompatibility [ 132 , 133 , 134 , 135 ]. SR foams combine the characteristics of silicone rubber and foam materials such as good resilience, high thermal stability, shape conformity, low density and light weight [ 136 ].…”

Section: Rubber Foaming Formulationmentioning

confidence: 99%

Chemistry, Processing, Properties, and Applications of Rubber Foams

Rostami‐Tapeh‐Esmaeil

Vahidifar

Esmizadeh

et al. 2021

Polymers

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With the ever-increasing development in science and technology, as well as social awareness, more requirements are imposed on the production and property of all materials, especially polymeric foams. In particular, rubber foams, compared to thermoplastic foams in general, have higher flexibility, resistance to abrasion, energy absorption capabilities, strength-to-weight ratio and tensile strength leading to their widespread use in several applications such as thermal insulation, energy absorption, pressure sensors, absorbents, etc. To control the rubber foams microstructure leading to excellent physical and mechanical properties, two types of parameters play important roles. The first category is related to formulation including the rubber (type and grade), as well as the type and content of accelerators, fillers, and foaming agents. The second category is associated to processing parameters such as the processing method (injection, extrusion, compression, etc.), as well as different conditions related to foaming (temperature, pressure and number of stage) and curing (temperature, time and precuring time). This review presents the different parameters involved and discusses their effect on the morphological, physical, and mechanical properties of rubber foams. Although several studies have been published on rubber foams, very few papers reviewed the subject and compared the results available. In this review, the most recent works on rubber foams have been collected to provide a general overview on different types of rubber foams from their preparation to their final application. Detailed information on formulation, curing and foaming chemistry, production methods, morphology, properties, and applications is presented and discussed.

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Section: Rubber Foaming Formulationmentioning

confidence: 99%

Chemistry, Processing, Properties, and Applications of Rubber Foams

Rostami‐Tapeh‐Esmaeil

Vahidifar

Esmizadeh

et al. 2021

Polymers

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“…Hence, the aim of this study was to develop an intrinsically conductive elastomeric foam with appropriate EMI shielding behavior that could withstand repeated bending using a scalable process. To that end, ethylene-propylene-diene monomer (EPDM) rubber, a copolymer of ethylene (45-75%), propylene monomers (13-45%), and nonconjugated dienes (ethylidene norbornene, dicyclopentadiene, and 1,4-hexadiene; 1-11%), was selected for its high hydrophobic characteristics as well as remarkable ozone and light resistivity [23]. These characteristics make EPDM the most commonly used rubber in the automotive and construction industries.…”

Section: Introductionmentioning

confidence: 99%

Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

et al. 2020

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The need for electromagnetic interference (EMI) shields has risen over the years as the result of our digitally and highly connected lifestyle. This work reports on the development of one such shield based on vulcanized rubber foams. Nanocomposites of ethylene–propylene–diene monomer (EPDM) rubber and multiwall carbon nanotubes (MWCNTs) were prepared via hot compression molding using a chemical blowing agent as foaming agent. MWCNTs accelerated the cure and led to high shear-thinning behavior, indicative of the formation of a 3D interconnected physical network. Foamed nanocomposites exhibited lower electrical percolation threshold than their solid counterparts. Above percolation, foamed nanocomposites displayed EMI absorption values of 28–45 dB in the frequency range of the X-band. The total EMI shielding efficiency of the foams was insignificantly affected by repeated bending with high recovery behavior. Our results highlight the potential of cross-linked EPDM/MWCNT foams as a lightweight EM wave absorber with high flexibility and deformability.

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“…5–8 Adding nanostructures into the polymers is a well-researched technology. 9–12 Conventional micron-scale fillers such as glass or carbon fibers have also been used in order to enhance the properties of nanocomposites with lower loadings than for commonly used polymer composites. 13…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8] Adding nanostructures into the polymers is a well-researched technology. [9][10][11][12] Conventional micron-scale fillers such as glass or carbon fibers have also been used in order to enhance the properties of nanocomposites with lower loadings than for commonly used polymer composites. 13 GO nanoribbons are oxygenated graphene sheets with much lower van der Waals interactions among them than graphene sheets.…”

Section: Introductionmentioning

confidence: 99%

Rheological and physical properties of a nanocomposite of graphene oxide nanoribbons with polyvinyl alcohol

Javanbakht

David

2020

Journal of Thermoplastic Composite Materials

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In this work, the physicochemical and rheological properties of a nanocomposite of graphene oxide (GO) and thermoplastic polyvinyl alcohol (PVA) are reported. After adding deionized water to PVA, the sample was heated and mixed. The polymer solution was divided in two portions, each of them containing PVA in water. GO nanoribbons were added to one portion of the PVA solution in water to obtain the nanocomposite suspension (1% w/w). The similarity of the Fourier-transform infrared spectra of PVA and its related nanocomposite was assessed (both having similar peaks, an important observation as it indicated the water absorption on the samples). The scanning electron microscopy images showed that PVA lost its spherical shape in composites due to the GO sheets coating. The characteristic peaks O− ( m/ e 16) and OH− ( m/ e 17) were observed in the time-of-flight secondary ion mass spectrometry negative mode spectra of PVA and nanocomposite of GO nanoribbons with PVA. The analysis of the OH−, O−, C2H−, and C2 − peaks of PVA and the nanocomposite of GO nanoribbons revealed that a reduction occurred for GO nanoribbons when coated with PVA. The rheological behaviors of samples in solution were studied and their shear rate versus shear stress were assessed. A non-Newtonian rheological behavior of the nanocomposite of GO nanoribbons with PVA was observed. The dielectric response of the nanocomposite of GO-PVA featured a simultaneous increase of both real and imaginary part of the complex permittivity toward low frequency due to the contribution of charge carriers. These results provide more understanding about the physical, mechanical, and dielectric properties of GO-PVA nanocomposite to make it appropriate in the construction of embedded capacitors. The novelty of our work lies in the rheological and physical properties of this nanocomposite in comparison with those of PVA that have not been previously reported.

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Elastomeric nanocomposite foams with improved properties for extreme conditions

Cited by 8 publications

References 48 publications

Chemistry, Processing, Properties, and Applications of Rubber Foams

Chemistry, Processing, Properties, and Applications of Rubber Foams

Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

Rheological and physical properties of a nanocomposite of graphene oxide nanoribbons with polyvinyl alcohol

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