Mechanical properties of CRETE, a polyurethane foam

Goods, S.H.; Neuschwanger, C. L.; Henderson, Craig C.; Skala, Dawn M.

doi:10.1002/(sici)1097-4628(19980516)68:7<1045::aid-app2>3.0.co;2-f

Cited by 73 publications

(63 citation statements)

References 3 publications

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“…The different relative densities obtained vary from 0.33 up to 0.85. This is a density range more spread than in previous published works devoted to high density polyurethane foams [1,10,14,15]. For the latters, the relative density was limited to a maximum of 0.6.…”

Section: Processingmentioning

confidence: 88%

Mechanical properties of high density polyurethane foams: I. Effect of the density

Saint-Michel

Chazeau

Cavaillé

et al. 2006

Composites Science and Technology

184

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This article presents the mechanical behaviour of rigid polyurethane foams with relative density (q f /q s ) above 0,3. The parameter taken into account is the density, which controls the foam architecture. The mechanical properties of the foams, characterised by large deformation compression tests and dynamic mechanical analyses, were compared to two theoretical models: (i) the Gibson and Ashby approach, widely used for foam description and (ii) the 2 + 1 phase model from Christensen and Lo, generally used for the description of particulate composite materials. In the studied density range, it is shown that the second approach is more appropriate. Moreover, the stress-strain curve and in particular yield stress have been modelled using two different approaches by extension of this model to the nonlinear domain.

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Section: Processingmentioning

confidence: 88%

Mechanical properties of high density polyurethane foams: I. Effect of the density

Saint-Michel

Chazeau

Cavaillé

et al. 2006

Composites Science and Technology

184

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“…It is well known that compressive strength of rigid foam has a significant relationship with density. A power-law expression can be used to show the relationship between compressive strength and density [9,16] .…”

Section: Effect Of Water Level On Density and Mechanical Properties Omentioning

confidence: 99%

Structures and physical properties of rigid polyurethane foams with water as the sole blowing agent

Cao

Zhang

2006

SCI CHINA SER B

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Rigid polyurethane foams blown by varying water level were prepared in this study. The structures and physical properties of rigid polyurethane foams blown by water were measured with FT-IR, universal testing machine (Instron3365), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The results show that polyurea and polybiuret were the typical characteristics, and the cream time and gel time were shorter for the fully water blown rigid foams than that for the fully cyclopentane blown foams. The density of foam samples decreased from 45.0 kg/m 3 to 27.4 kg/m 3 with the increase of water level from 3 pph to 7 pph. Compressive strength exhibited the similar behavior with density. The average cell size of foam samples ranged from 241 µm to 356 µm with the increase of water level from 3 pph to 7 pph, respectively. At the same time, poorer dimensional stability was encountered with the increase of average cell size due to fast diffusion rate of CO 2 out of the foam. The results of thermal analysis show that the glass transition temperature (T g ) shifted to a higher temperature with the increase of isocyanate level when more water was used as chemical blowing agent.

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“…On the other hand, the properties of the foam mainly depend on the type of polyol such as functionality and hydroxyl value, and type and amount of surfactant, and blowing agent. To reinforce the foam, composites with particle, clays and fiber have been considered [17][18][19][20][21]. As far as the present authors are concerned, systematic investigations of the effects of surfactant on various properties of RPUF are sparse, perhaps except those blown with water [7,22].We synthesized various types of RPUFs from CMDI and polypropylene glycols (PPGs) with an environmentally friendly physical blowing agent, viz.…”

mentioning

confidence: 99%