Preparation of polymer foams with a gradient of cell size: Further exploring the nucleation effect of porous inorganic materials in polymer foaming

Yu, Jiaqi; Song, Li; Chen, Feng; Fan, Ping; Sun, Li; Zhong, Ming; Yang, Jintao

doi:10.1016/j.mtcomm.2016.08.006

Cited by 34 publications

(27 citation statements)

References 20 publications

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“…Because a cocontinuous morphologies emerged when the concentration of PEO was more than 30%. The interface bonding force between PCL and PEO phases was too large to help cell nucleation and cell growth, 34,35 so that it would be difficult to initiate the opening of a cell at the cell wall because of the higher melt strength. Aer the leaching process, the open-pore content was obviously improved for all the foamed samples, and the maximum porosity of 85% was detected with PCL70.…”

Section: Overall Porosity and Interconnectivity Of Scaffoldsmentioning

confidence: 99%

Fabrication of fibrillated and interconnected porous poly(ε-caprolactone) vascular tissue engineering scaffolds by microcellular foaming and polymer leaching

et al. 2020

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Section: Overall Porosity and Interconnectivity Of Scaffoldsmentioning

confidence: 99%

Fabrication of fibrillated and interconnected porous poly(ε-caprolactone) vascular tissue engineering scaffolds by microcellular foaming and polymer leaching

et al. 2020

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“…Gradient porosity syntactic foams with enhanced static fracture and impact resistance have already been prepared by varying HGM size and volume fraction [20][21][22][23]. However, except for some metallic foams [16], no attempt has so far been reported on the replacement of rigid and fragile HGMs with cellular micro-particles (CMPs).…”

Section: Introductionmentioning

confidence: 99%

Effect of Porosity Gradient on Mechanical Properties of Cellular Nano-Composites

et al. 2020

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With their hierarchical architectures incorporating gradients in composition, porosity, and orientation, natural materials have evolved optimized balance of mechanical properties. Deciphered from the structure of bamboo, we prepared cellular solids with convex and/or concave porosity gradient and investigated their static mechanical and impact properties. Non-monotonous porosity dependences of tensile, crush, and impact strength were related to the shape of porosity gradient rather than to the properties of the wall material alone. Our results provide experimental evidence, that novel mechanically robust low density additively fabricated cellular nano-composites with convex porosity gradient satisfy the structural requirements of lightweight engineering parts. Moreover, novel functions, such as reduced flammability or electrical conductivity, can easily be introduced by selecting the type and spatial organization of nanoparticles and cellular structure of the cellular micro-particles (CMPs).

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“…Polymer foams with a controlled pore size gradient have been proposed as a way to reach improved acoustic insulation [62] or electromagnetic interference shielding [63], as well as to mimic high-performance biological structures (e.g. bones) [64]. A few attempts to obtain this kind of structures using CO 2 foaming can be found in the literature [64,65].…”

Section: Introductionmentioning

confidence: 99%

“…bones) [64]. A few attempts to obtain this kind of structures using CO 2 foaming can be found in the literature [64,65]. Yu et al [64] obtained PMMA, polystyrene (PS), and poly(lactic acid) (PLA) foams with a pore size gradient induced by the presence of a metallic film on one of the faces of the polymer precursor; obtaining the best results with PLA, which presented a pore size gradient between 13 and 40 mm.…”

Section: Introductionmentioning

confidence: 99%

“…A few attempts to obtain this kind of structures using CO 2 foaming can be found in the literature [64,65]. Yu et al [64] obtained PMMA, polystyrene (PS), and poly(lactic acid) (PLA) foams with a pore size gradient induced by the presence of a metallic film on one of the faces of the polymer precursor; obtaining the best results with PLA, which presented a pore size gradient between 13 and 40 mm. Ngo et al [65] employed a specific foaming setup, including a foaming vessel in which PMMA long strips (25 cm) were foamed under a temperature gradient, obtained a heterogeneous expansion of the PMMA strip which leads to different porosities and pore sizes, but always with cell sizes in the microporous range.…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous PMMA foams with templated pore size obtained by localized in situ synthesis of nanoparticles and CO2 foaming

Pinto

Morselli

Bernardo

et al. 2017

Polymer

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a b s t r a c tPolymer foams with controlled and templated pore size have been obtained for the first time by CO 2 gas dissolution foaming from poly(methyl methacrylate) (PMMA) films. This kind of materials, with a variable porous structure, mimic some high-performance natural materials and could present significant interest in many applications. However, up to now their controlled fabrication has not been successfully achieved. Herein, we present a method to achieve a fine control in the production of such materials. Thermal in situ synthesis of ZnO nanoparticles from Zn(OAc) 2 was proposed to obtain PMMA nanocomposites, in which the ZnO nanoparticles induce heterogeneous nucleation that leads to formation of pores with size below the micron, upon CO 2 foaming. Starting from templated solid PMMA samples with well-differentiated regions, presenting or not ZnO nanoparticles, it was possible to obtain PMMA-based foams with well-defined areas of different pore sizes.

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Preparation of polymer foams with a gradient of cell size: Further exploring the nucleation effect of porous inorganic materials in polymer foaming

Cited by 34 publications

References 20 publications

Fabrication of fibrillated and interconnected porous poly(ε-caprolactone) vascular tissue engineering scaffolds by microcellular foaming and polymer leaching

Fabrication of fibrillated and interconnected porous poly(ε-caprolactone) vascular tissue engineering scaffolds by microcellular foaming and polymer leaching

Effect of Porosity Gradient on Mechanical Properties of Cellular Nano-Composites

Nanoporous PMMA foams with templated pore size obtained by localized in situ synthesis of nanoparticles and CO2 foaming

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