Cyclic olefin copolymer–silica nanocomposites foams

Pegoretti, Alessandro; Dorigato, Andrea; Biani, A.; Šlouf, Miroslav

doi:10.1007/s10853-015-9710-9

Cited by 15 publications

(15 citation statements)

References 39 publications

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“…All foams present closed cell morphology with a narrow statistical distribution of the cell sizes around an average value. Similar morphological features were observed in a previous work of this group on COC foams filled with nano silica [43]. From these micrographs, it is immediately evident the role played by the xGnP content and of the foaming pressure on the morphology of the samples.…”

Section: Results and Discussion 31 Morphologysupporting

confidence: 87%

“…In fact, composites with an xGnP content of 10 wt% show a 55% increase in the tensile modulus. The stiffening effect reported in our previous work for the same COC matrix reinforced with silica nanoparticles was less pronounced [18,43]. This discrepancy is probably due to the higher stiffness of the xGnP with respect to silica and to its high aspect ratio which favours the load transfer.…”

Section: Mechanical Behaviourmentioning

confidence: 55%

“…Foaming was obtained upon fast depressurization from supercritical to ambient conditions. It is worthwhile to note that the above parameters were optimized in a previous work of this group regarding the preparation and characterization of COC/fumed silica nanocomposite foams [43]. The plot in Figure 1b outlines the experimental conditions at which the composite materials were subjected during the foaming process in the reactor.…”

Section: Foaming Processmentioning

confidence: 99%

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Mechanical behaviour of cyclic olefin copolymer/exfoliated graphite nanoplatelets nanocomposites foamed through supercritical carbon dioxide

Biani¹,

Dorigato²,

Bonani³

et al. 2016

Express Polym. Lett.

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Abstract.A cycloolefin copolymer matrix was melt mixed with exfoliated graphite nanoplatelets (xGnP) and the resulting nanocomposites were foamed by supercritical carbon dioxide. The density of the obtained foams decreased with the foaming pressure. Moreover, xGnP limited the cell growth during the expansion process thus reducing the cell diameter (from 1.08 to 0.22 mm with an XGnP amount of 10 wt% at 150 bar) and increasing the cell density (from 12 to 45 cells/mm 2 with a nanofiller content of 10 wt% at 150 bar). Electron microscopy observations of foams evidenced exfoliation and orientation of the nanoplatelets along the cell walls. Quasi-static compressive tests and tensile creep tests on foams clearly indicated that xGnP improved the modulus (up to a factor of 10 for a xGnP content of 10 wt%) and the creep stability.

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Section: Results and Discussion 31 Morphologysupporting

confidence: 87%

Section: Mechanical Behaviourmentioning

confidence: 55%

Section: Foaming Processmentioning

confidence: 99%

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Mechanical behaviour of cyclic olefin copolymer/exfoliated graphite nanoplatelets nanocomposites foamed through supercritical carbon dioxide

Biani¹,

Dorigato²,

Bonani³

et al. 2016

Express Polym. Lett.

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“…However, biodegradable polymer foams can play an important role in the future because of the ultimate disposal problem of these nondegradable polymer foams . Supercritical carbon dioxide (scCO 2 ) has recently attracted attention as a physical blowing agent to produce the polymeric foams . ScCO 2 has desirable properties for the use as a blowing agent because of its environmental friendliness and inexpensiveness in comparison to chemical blowing agents.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of microcellular polylactide/modified silica nanocomposite foams

Jeong

Park

Kim

2019

J of Applied Polymer Sci

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Microcellular polylactide (PLA)/modified-silica (m-silica) nanocomposite foams were prepared in a batch process using supercritical carbon dioxide as physical blowing agent. To enhance the dispersion in the PLA matrix, silica nanoparticles were modified by dodecyltrichlorosilane) and were melt compounded with PLA using a twin-screw extruder. PLA/m-silica nanocomposites with msilica contents of 0.5, 1, 2, 3, and 5 wt % were obtained. The incorporation of m-silica nanoparticles in PLA enhanced the thermal and mechanical properties of PLA. The resultant foams were observed by scanning electron microscopy (SEM) and average cell diameter and cell density were calculated using SEM micrographs. The incorporation of m-silica nanoparticles into the PLA matrix had the effect of decreasing the cell diameter and increasing the cell uniformity and cell density.

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“…Studies have also been made in other fields, concerning the formation of COC nanoparticles [35], production of COC/silica nanocomposites foams [36] and the processability of COC yarn by melt spinning [37]. Very recently, a paper has been published by Saadé et al [38], concerning the modification of cyclic olefin copolymer in order to conduct to new electrochromatographic stationary phases.…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical ageing of ethylene–norbornene copolymers: a review

et al. 2017

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The main object of this report is to review and summarize the current state of the scientific literature relating to physico-chemical ageing of ethylene-norbornene copolymers (ENCs). These processes occur through different means such as photodegradation under the effect of ultraviolet radiation, temperature and ionizing radiation (under air or oxygen). In most cases ageing causes chains scissions that lead to the creation of degradation compounds that exhibit high mobility, corresponding to their low molecular weight and/or high polarity. Cross-linking can also occur, leading to the modification of mechanical properties. The presence of oxygen during ageing is of great importance for the physico-chemical modifications of those polymers in terms of oxidation and thermal stability. ENCs belong to cyclic olefin copolymers (COC) class, whose synthesis was developed in the late 1950s. Nevertheless, commercial applications are relatively new. They attract growing interest in different fields, due to their very useful physical and chemical properties such as transparency, heat and chemical resistance, low permeability to gas as well as biocompatibility. In the literature, a large number of papers deal with the synthesis and characterization of different grades of ENC, but only a few deal with the effects of ageing on these materials. This literature review consists of a summary of the main milestones in the development of COC as well as of cyclic olefin polymers (COP), a review of main techniques for predicting ageing, degradation of additives and interaction between COC/COP and contact environment as well as toxicity of the extractables.

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Cyclic olefin copolymer–silica nanocomposites foams

Cited by 15 publications

References 39 publications

Mechanical behaviour of cyclic olefin copolymer/exfoliated graphite nanoplatelets nanocomposites foamed through supercritical carbon dioxide

Mechanical behaviour of cyclic olefin copolymer/exfoliated graphite nanoplatelets nanocomposites foamed through supercritical carbon dioxide

Fabrication of microcellular polylactide/modified silica nanocomposite foams

Physico-chemical ageing of ethylene–norbornene copolymers: a review

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