Highly anisotropic crosslinked HDPE foams with a controlled anisotropy ratio: Production and characterization of the cellular structure and mechanical properties

Bernardo, Victoria; Laguna‐Gutiérrez, Ester; Lopez‐Gil, A.; Rodríguez‐Pérez, Miguel Ángel

doi:10.1016/j.matdes.2016.10.051

Cited by 39 publications

(17 citation statements)

References 26 publications

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“…Several works claim that anisotropic cellular structures can be a result of a preferable growth of the cells in a certain direction. To evaluate if this was the reason underlying the anisotropy observed in the materials of the present work, the expansion ratios in different directions of the cellular materials were measured.…”

Section: Resultsmentioning

confidence: 99%

“…Oliveira‐Salmazo et al used a different approach to control the anisotropy ratio (from 0.9 to 2.48) in natural rubber cellular samples by means of varying the dimensions of the solid precursors. In the work of Bernardo et al , cell anisotropy was also promoted by the mould shape, but controlled by the process parameters. This process allowed the realization of cellular high‐density polyethylene with very high anisotropy ratios, ranging from 2.95 to 3.75.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy in nanocellular polymers promoted by the addition of needle‐like sepiolites

Bernardo

León

Rodríguez‐Pérez

2019

Polymer International

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This work presents a new strategy for obtaining nanocellular materials with high anisotropy ratios by means of the addition of needle-like nanoparticles. Nanocellular polymers are of great interest due to their outstanding properties, whereas anisotropic structures allow the realization of improved thermal and mechanical properties in certain directions. Nanocomposites based on poly(methyl methacrylate) (PMMA) with nanometric sepiolites are generated by extrusion. From the extruded filaments, cellular materials are produced using a two-step gas dissolution foaming method. The effect of adding various types and contents of sepiolites is investigated. As a result of the extrusion process, the needle-like sepiolites are aligned in the machine direction in the solid nanocomposites. Regarding the cellular materials, the addition of sepiolites allows one to obtain anisotropic nanocellular polymers with cell sizes of 150 to 420 nm and cell nucleation densities of 10 13 -10 14 nuclei cm −3 and presenting anisotropy ratios ranging from 1.38 to 2.15, the extrusion direction being the direction of the anisotropy. To explain the appearance of anisotropy, a mechanism based on cell coalescence is proposed and discussed. In addition, it is shown that it is possible to control the anisotropy ratio of the PMMA/sepiolite nanocellular polymers by changing the amount of well-dispersed sepiolites in the solid nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropy in nanocellular polymers promoted by the addition of needle‐like sepiolites

Bernardo

León

Rodríguez‐Pérez

2019

Polymer International

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“…On the other hand, mechanical properties are also inuenced by the characteristics of the microstructure. 15,46 The S3 sample yielded a minimum foam density. Thus, it exhibited higher compressive strength and specic compression strength than the other samples.…”

Section: Mechanical Propertiesmentioning

confidence: 97%

Thermal insulation and stability of polysiloxane foams containing hydroxyl-terminated polydimethylsiloxanes

Zhang

Wang

et al. 2018

RSC Adv.

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“…Polysiloxane foam can be composed by the reaction between polymethylhydrogensiloxane (PMHS), vinyl-polydimethylsiloxane (V-PDMS), and hydroxyl-terminated polydimethylsiloxane (OH-PDMS) [ 1 ]. Traditional polymeric foams possess many advantages such as lightweight, low thermal conductivity, high specific surface area, and specific strength [ 2 , 3 , 4 , 5 ]. Compared with traditional polymeric foam, polysiloxane foam possesses excellent performance in terms of low and high temperature resistance, chemical stability, electrical insulation, and additional biological compatibility [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Polyhedral Oligomeric Silsesquioxane (POSS) on Thermal and Mechanical Properties of Polysiloxane Foam

Zhang

et al. 2020

Materials

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The thermal and mechanical properties of polysiloxane foam are greatly improved by the addition of acrylolsobutyl polyhedral oligomeric silsesquioxane (MA0701, hereinafter referred to as MAPOSS), which has double bonds. The morphologies and properties of the polysiloxane composite foam were characterized. The average cell diameter of the composite foams decreased, while the cell density increased with increasing MAPOSS. Meanwhile, MAPOSS can enhance thermal conductivity and thermal stability. Thermal conductivity increased by 25%, and the temperature at the maximum weight loss rate increased from 556 °C to 599 °C. In addition, MAPOSS also promoted heterogeneous nucleation by functioning as a nucleating agent, which can increase cell density to improve the mechanical properties. The compressive strength of the composite foam increased by 170% compared with that of pure foam. In the composite, MAPOSS increased the cross-linking density by acting as a physical cross-linking point and limited the movement of the segments.

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Highly anisotropic crosslinked HDPE foams with a controlled anisotropy ratio: Production and characterization of the cellular structure and mechanical properties

Cited by 39 publications

References 26 publications

Anisotropy in nanocellular polymers promoted by the addition of needle‐like sepiolites

Anisotropy in nanocellular polymers promoted by the addition of needle‐like sepiolites

Thermal insulation and stability of polysiloxane foams containing hydroxyl-terminated polydimethylsiloxanes

Effects of Polyhedral Oligomeric Silsesquioxane (POSS) on Thermal and Mechanical Properties of Polysiloxane Foam

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