Influence of foaming process on the structure–properties relationship of foamed LDPE/silica nanocomposites

Saiz‐Arroyo, Cristina; Rodríguez‐Pérez, Miguel Ángel; Velasco, José Ignácio; Saja, J.A. de

doi:10.1016/j.compositesb.2012.10.045

Cited by 33 publications

(71 citation statements)

References 37 publications

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“…As far as the author knows, for silica/polymer foamed nanocomposites, the multifunctional role of the nanoparticles and the effect of these nanoparticles on the foam properties have not been analyzed in detail. In addition, the number of papers in which foamed nanocomposites are produced by using silica particles and non-polar semicrystalline polymers is very scarce [3,24,25]. This is another aspect in which this paper presents novel results.…”

Section: Introductionmentioning

confidence: 85%

Low density polyethylene/silica nanocomposite foams. Relationship between chemical composition, particle dispersion, cellular structure and physical properties

Laguna‐Gutiérrez

Saiz‐Arroyo²,

Velasco

et al. 2016

European Polymer Journal

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Section: Introductionmentioning

confidence: 85%

Low density polyethylene/silica nanocomposite foams. Relationship between chemical composition, particle dispersion, cellular structure and physical properties

Laguna‐Gutiérrez

Saiz‐Arroyo²,

Velasco

et al. 2016

European Polymer Journal

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“…Based on all of these articles, we conclude that (1) the improvement in mechanical properties due to nanofiller addition is typically modest for thermoplastics, although occasional cases of much larger improvements have been documented, 8,21,24 (2) dramatic improvements are possible when the matrix is rubbery, 3,6,25 (3) filler surface modification and the foaming operation can have a significant effect on the efficacy of reinforcement. 2,11,26 In addition, there are numerous articles where the addition of nanofiller was shown to affect mechanical properties, but foam density was not stated. These articles are also included in Table 1, but datasheets for those papers are not presented in the Online Supplementary Information.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a quantitative ''normalization'' for the effect of foam density, or even a qualitative judgment of whether density changes may have affected the mechanical properties, is not possible from the data. There are also numerous articles, 2,[8][9][10][11] especially in the microcellular foams literature, in which the foam density is not given explicitly but the mean cell size and the cell number density, N f , are both quoted. At first glance, a combination of the two should give the foam density since…”

Section: Introductionmentioning

confidence: 99%

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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“…Similar to the case of PP-nanocomposites foams, various authors have reported the preparation, characterization, and properties of PE-nanocomposite foams [34][35][36][37]. Arroyo et al [37] developed low-density polyethylene/silica nanocomposite foams by using chemical foaming agent.…”

Section: Polyethylene-based Foamsmentioning

confidence: 99%

“…Arroyo et al [37] developed low-density polyethylene/silica nanocomposite foams by using chemical foaming agent. They applied diferent concentrations of silica between 1 and 9%, and foaming agent was 5% in weight.…”

Section: Polyethylene-based Foamsmentioning

confidence: 99%

Thermoplastic Foams: Processing, Manufacturing, and Characterization

Altan¹

2018

Recent Research in Polymerization

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Polymer foams have wide application area due to their light weight, resistance to impact, high thermal insulation, and damping properties. Automotive, packing industry, electronic, aerospace, building construction, bedding, and medical applications are some of the ields that polymer foams have been used. However, depending on their cell structure-open or closed cell-polymer foams have diferent properties and diferent application areas. In this work, the most used thermoplastic foams with closed cells such as polypropylene, polyethylene, and polystyrene or polylactic acid have been focused. Their melt strength, degree of crystallinity for semi-crystalline ones, and viscosity have great importance on cell morphology. Cells in small diameter with high dense in polymer matrix are preferable. However, obtaining ine cells is not easy in each case, and it is still under investigation for some polymers. There are several ways to improve cell morphology, and one of them is addition of nanoparticle to the polymer. During foaming process, nanoparticles behave like nucleating agent that cells nucleate at the boundary between polymer and the nanoparticle. Besides, foaming agents contribute the homogenous dispersion of the nanoparticles in the polymer matrix, and this improves the properties of the polymer foams and generates multifunctional material as polymer nanocomposite foams.

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Influence of foaming process on the structure–properties relationship of foamed LDPE/silica nanocomposites

Cited by 33 publications

References 37 publications

Low density polyethylene/silica nanocomposite foams. Relationship between chemical composition, particle dispersion, cellular structure and physical properties

Low density polyethylene/silica nanocomposite foams. Relationship between chemical composition, particle dispersion, cellular structure and physical properties

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

Thermoplastic Foams: Processing, Manufacturing, and Characterization

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