Anisotropy of the stiffness and strength of rigid low-density closed-cell polyisocyanurate foams

Andersons, J.; Kirpļuks, Miķelis; Stiebra, Laura; Cābulis, Uģis

doi:10.1016/j.matdes.2015.12.122

Cited by 57 publications

(58 citation statements)

References 40 publications

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“…Whereas in T direction, the elongated cells are able to undergo larger deformation before failure. These hypotheses are supported by Andersons et al, [15] whom worked on stiffness and strength of closed cells PUIR foams.…”

Section: Resultsmentioning

confidence: 75%

“…Indeed, the polyol functionality, i.e., OHV and/or polyol viscosity have a strong impact on PU network formation, PU foams density, and the closed or open characters of the foam cells . The size, shape, and spatial distribution of the cells are also some other parameters which control the physical properties . PU foams thermal and mechanical properties are closely dependent of the foam morphology.…”

Section: Introductionmentioning

confidence: 99%

“…[14] The size, shape, and spatial distribution of the cells are also some other parameters which control the physical properties. [15] PU foams thermal and mechanical properties are closely dependent of the foam morphology.…”

Section: Introductionmentioning

confidence: 99%

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Elaboration and Characterization of Advanced Biobased Polyurethane Foams Presenting Anisotropic Behavior

Furtwengler

Boumbimba

Avérous

2018

Macro Materials & Eng

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Biobased and open cell polyurethane (PU) foams are produced from a synthesized sorbitol‐based polyester polyol. Different formulations are developed with various blowing agent systems (chemical vs physical blowing). Synthetized foams are fully characterized and compared. The cell morphology is carefully investigated by tomography and scanning electron microscopy. The chemical nature of the primary compounds, foaming kinetics, density, thermal behavior, and conductivity are fully studied, with also the main transition materials temperatures. It is shown that blowing agents especially impact the foaming kinetics. In the case of chemically blowing foams, higher foaming rate and temperatures are obtained. The mechanical behavior is particularly analyzed using quasi‐static compression tests, according two main axes compared to the rise direction. A direct relationship is observed between the formulation, foam structure, foam morphology, and corresponding mechanical properties. Results clearly highlight unexpected properties of biobased PU foams with unveil anisotropic mechanical properties.

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Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Elaboration and Characterization of Advanced Biobased Polyurethane Foams Presenting Anisotropic Behavior

Furtwengler

Boumbimba

Avérous

2018

Macro Materials & Eng

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“…In order to evaluate these differences, the shape anisotropy ratio R, defined as the average ratio of cell size in the rise and transverse directions, is considered. Geometrical anisotropy of foam cells leads to anisotropic mechanical properties of foams, with higher strength and stiffness exhibited in the rise direction [7]. The shape anisotropy ratio generally decreases with increasing foam density [8].…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Behavior of PET Foams

2018

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Shape memory properties of PET (polyethylene-terephthalate) foams have been evaluated for two different foam densities. Samples were subjected to multiple memory-recovery cycles along three different directions to measure the effect of foam anisotropy on static mechanical and shape memory properties. The memory cycle was performed by uniaxial compression tests at room temperature. Despite these severe conditions, PET foams demonstrated very good shape memory behavior with shape recovery always higher than 90%. Due to cycling, the mechanical performance of foam samples is partially reduced, mainly along the extrusion direction of the foam panels. Despite this loss of static performance, shape memory properties are only partially affected by thermo-mechanical cycles. The maximum reduction is 10% for shape fixity and 3% for shape recovery. The experimental results are particularly interesting considering that compression tests were undertaken at room temperature. Indeed, PET foams seem to be optimal candidates for self-repairing structures.

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“…Shape and size of the cells also influence the properties of these materials. While the effect of the cell size in conventional foams is not clearly established [17], the anisotropy of the cellular structure has been proved to have a strong influence in the mechanical behavior [2,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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

Bernardo

Laguna‐Gutiérrez

Lopez‐Gil³

et al. 2017

Materials & Design

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Anisotropy of the stiffness and strength of rigid low-density closed-cell polyisocyanurate foams

Cited by 57 publications

References 40 publications

Elaboration and Characterization of Advanced Biobased Polyurethane Foams Presenting Anisotropic Behavior

Elaboration and Characterization of Advanced Biobased Polyurethane Foams Presenting Anisotropic Behavior

Shape Memory Behavior of PET Foams

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

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