Physical properties of silicone foams filled with carbon nanotubes and functionalized graphene sheets

Verdejo, Raquel; Saiz‐Arroyo, Cristina; Carretero‐González, Javier; Barroso‐Bujans, Fabienne; Rodríguez‐Pérez, Miguel Ángel; López–Manchado, Miguel A.

doi:10.1016/j.eurpolymj.2008.06.033

Cited by 129 publications

(85 citation statements)

References 45 publications

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“…Since the material comprising the cell walls of the foam is a nanofiller-reinforced composite, this suggests that nanofillers are likely to be more effective at modifying the properties of foams made from low-modulus polymers. Indeed, this is borne out by Figure 6: the greatest improvement in modulus appears for the flexible PU foam from Cao et al 3 and the silicone foams of Verdejo et al 6,25 -materials in which the nanofiller is added to a soft polymer. Finally, we turn to discussing the potential mechanisms whereby nanofillers may improve the mechanical properties.…”

Section: Nanofiller Effects In Polymer Foamsmentioning

confidence: 97%

“…6,25 The solid lines correspond to envelopes of closed and open-celled foams from Gibson and Ashby. 65 improvement can be realized.…”

Section: Nanofiller Effects In Polymer Foamsmentioning

confidence: 99%

“…Figure 1 illustrates an example of an especially dramatic improvement in the strength of polyurethane (PU) foams with addition of montmorillonite (MMT) clay: the addition of only a few weight percent clay improves the tensile strength and the compressive strength by 110% and 152%, respectively. 1 Many such examples of nanofiller-induced improvements in modulus or strength are cited in the literature [2][3][4][5][6] and the supplementary information has compiled data from numerous articles showing similar results. A recent review article also commented on the efficacy of nanofillers at improving foam properties.…”

Section: Introductionmentioning

confidence: 99%

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How much do nanoparticle fillers improve the modulus and strength of polymer foams?

Lobos

Velankar

2014

Journal of Cellular Plastics

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Nanofiller reinforcing agents can significantly improve the strength and modulus of polymer foams. But these improvements are often accompanied by changes in foam density (or equivalently the expansion ratio or void volume). The efficacy of nanofillers as reinforcing agents can only be judged once the density differences are accounted for. We review the literature and show that representing the data on Ashby charts of modulus against foam density is an effective way of evaluating whether nanofillers have a significant reinforcing effect or not. The literature suggests that strength and improvements due to nanofiller -after accounting for foam density changes -are typically modest for thermoplastic foams. However, major improvements are possible for reactively generated foams, especially flexible polyurethane foams.

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Section: Nanofiller Effects In Polymer Foamsmentioning

confidence: 97%

“…6,25 The solid lines correspond to envelopes of closed and open-celled foams from Gibson and Ashby. 65 improvement can be realized.…”

Section: Nanofiller Effects In Polymer Foamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

How much do nanoparticle fillers improve the modulus and strength of polymer foams?

Lobos

Velankar

2014

Journal of Cellular Plastics

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“…12 Bifunctional organosilanes, known also as coupling agent, remedy the problems aforementioned and are used to enhance the reinforcing capability of silicas in rubber. 12 Other fillers such as layer silicates [13][14][15][16][17][18] , carbon nanotubes [19][20][21] , and exfoliated graphene 22,23 have been intensively researched as a potential reinforcing agent in rubber. Several examples of reviews [24][25][26][27] suggest that the nanofillers mentioned above are a promising reinforcing agent to improve mechanical and dynamic properties of rubber particularly at low filler loading.…”

Section: Introductionmentioning

confidence: 99%

The potential of kaolin as a reinforcing filler for rubber composites with new sulfur cure systems

Sheikh

Yin

Ansarifar

et al. 2017

Journal of Reinforced Plastics and Composites

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The effect of a large amount of kaolin (China clay) on the viscosity, cure, hardness, Young’s modulus, tensile strength, elongation at break, stored energy density at break, tear energy and compression set resistance of some sulfur-cured natural rubber, polybutadiene rubber and ethylene-propylene-diene rubber composites was investigated. The kaolin surface had been pre-treated with 3-mercaptopropyltrimethoxysilane to improve its dispersion in the rubbers. For natural rubber, the hardness and Young’s modulus improved, tensile strength and tear energy were unchanged and the remaining properties deteriorated when kaolin was added. The viscosity increased and the scorch and optimum cure times decreased whilst the cure rate rose with kaolin. For polybutadiene rubber and ethylene-propylene-diene rubber, with the exception of the compression set resistance, all the properties including the viscosity gained from the kaolin. The kaolin was found to be extending or non-reinforcing filler for natural rubber, and highly reinforcing for polybutadiene rubber and EPDM. In addition, the scorch and optimum cure times and cure rate of polybutadiene rubber benefitted, whereas with the exception of the scorch time, the optimum cure time and cure rate of ethylene-propylene-diene rubber were adversely affected by kaolin.

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“…Verdejo et al [131,132] used as-produced multiwall CNTs in reactive silicone foams and studied the thermal and flammability characteristics of the developed systems. They observed a noticeable increase in the degradation temperature of almost 60 °C, which was attributed to the presence of CNTs, and an enhancement of the thermal dissipation efficiency, which was assigned to both the direct presence of CNTs and their indirect physical effect on the cellular structure.…”

Section: Thermal Stability and Flammabilitymentioning

confidence: 99%

Estudio de Nanocompuestos de Espumas de Poliuretano Reforzadas con Nanocargas en Base Carbono

Bernal¹,

Mar²

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A la meua familia AGRADECIMIENTOSQuisiera agradecer, en primer lugar, al Ministerio de Ciencia e Investigación por la financiación para la realización de esta Tesis, mediante la concesión de la Beca FPI.A mis directores de Tesis, Dra. Raquel Verdejo y Dr. Miguel Ángel López Manchado por darme la oportunidad de trabajar con vosotros. A Raquel, por todo lo que me has enseñado durante estos años y por todo el tiempo que me has dedicado. A Miguel Ángel por tus comentarios constructivos, tus consejos y tu paciencia.A mi tutor en la UPV, Prof. Vicente Amigò por toda la ayuda que me has brindado sin apenas conocerme.Al Prof. Miguel Ángel Rodríguez Pérez de la Universidad de Valladolid por darme la posibilidad de trabajar en tu grupo y aprender más sobre espumas.I would like to thank Prof. Anthony J. Ryan, from The University of Sheffield, and Prof. Isabelle Huynen, from Université Catholique de Louvain, for your support and interest on my work.A todos mis compañeros del grupo por todos los ánimos y las risas. A Mario, Lean, Laura Peponi, Nicoletta, Iván y Sami. A mis chicas, Nella, Nat y Lauris, por todos los buenos momentos juntas entre recetas de cocina, clases de punto y bailes Bollywood! Quiero agradecer especialmente a Nella por ser mi profesora de la vida durante estos años y por las largas tardes-noches compartidas en la oficina. Y a Mario, nuestro "chico guapo" por todo el apoyo y por esas "características limitantes" que nos unen.A todo el grupo de Cauchos, en especial a Juan, Irene, Marta y Pilar, por ser como sois y por todas esas celebraciones en el laboratorio con vino, callos, migas y pasteles. Y a Miguel Arroyo, por esas paellas "madrileñas" que me hacen sentir como en casa.A Rodri, Jose e Isabel Quijada por haberme dejado participar en vuestros trabajos, por todo lo que he aprendido con vosotros y por haber confiado en mí.Al grupo del CellMat de la Universidad de Valladolid por haberme acogido tan bien durante las semanas que he estado con vosotros. En especial a Samu, Sergio y a Eusebio por vuestra colaboración en mis experimentos de radioscopia y DMA.I would like to thank my dear friends Masa, AC and Susi, for our great times in Sheffield.A special thanks to Isabel and Margherita for taking care of me during those hard months in Louvain-la-Neuve and for your friendship. Grazie Margheri per le nostre pause caffè e tutti gli scherzi! A todos mis amigos que me habéis apoyado durante este tiempo y, aunque en "la terreta" siempre os he tenido cerca. Y gracias a todas las personas que me han ayudado durante estos años. RESUMENLas espumas de nanocompuestos poliméricos tienen un gran interés tanto en áreas tecnológicas como científicas. Esto es debido a la combinación de las excelentes propiedades de las nanopartículas y la tecnología de espumado, dando lugar al desarrollo de materiales ligeros y multifuncionales. Este tipo de sistemas se utilizan en aplicaciones de alto rendimiento tan diversas como biomedicina, electrónica, paneles estructurales y embalajes, entre otras.Esta Tesis está basada en el desarro...

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Physical properties of silicone foams filled with carbon nanotubes and functionalized graphene sheets

Cited by 129 publications

References 45 publications

How much do nanoparticle fillers improve the modulus and strength of polymer foams?

How much do nanoparticle fillers improve the modulus and strength of polymer foams?

The potential of kaolin as a reinforcing filler for rubber composites with new sulfur cure systems

Estudio de Nanocompuestos de Espumas de Poliuretano Reforzadas con Nanocargas en Base Carbono

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