Structural and mechanical properties of flexible polyurethane foams cured under pressure

@article{Rampf2012StructuralAM,
  title={Structural and mechanical properties of flexible polyurethane foams cured under pressure},
  author={Markus Rampf and Olga Speck and Thomas Speck and Rolf H. Luchsinger},
  journal={Journal of Cellular Plastics},
  year={2012},
  volume={48},
  pages={53 - 69}
}
Flexible two-component polyurethane foam was synthesized under various extents of overpressure up to 2 bar. The influence of the pressure conditions on shrinkage and basic foam properties such as the relative density, microstructure, and ratio of open to closed pores as well as the elastic mechanical properties were investigated. The relationship between the relative foam density and the applied overpressure is shown to be rather linear. An abrupt change of the mainly open pore structure to… 

Figures from this paper

Investigation of a fast mechanical self-repair mechanism for inflatable structures
Abstract The self-repair mechanism of flexible cellular as well as dense polyurethane coatings applied on the internal side of a commercially available membrane for inflatable structures was
Comparison of flexible polyurethane foams properties from different polymer polyether polyols
Abstract Flexible polyurethane foams (FPUs) having polystyrene (PS) stabilized by silica gel or polystyrene-acrylonitrile (SAN) particles were synthesized employing polymer polyether polyols (PPPs).
Physico-Mechanical Properties of Rigid Polyurethane Foams Synthesized From Modified Castor Oil Polyols
Using two different formulations with isocyanate/polyol (NCO/OH) ratios of 1/2 and 1/1, rigid castor oil-based polyurethane foams (RCPUFs) were prepared by oneshot method. Foam reaction involved
Effect of fiber surface characteristics on foam properties
Besides natural fibers, synthetic fiber filaments are increasingly used in papermaking industry nowadays. As long fiber is used as raw material, it is necessary to design a process to prevent fiber
Recycled-based thermosetting material obtained from the decomposition of polyurethane foam wastes with castor oil
In this work, a castor-oil-based process for flexible polyurethane foam scrap decomposition was used to prepare a recycled-based polyurethane foam. Decomposed polyurethane (DP) and 4,4′
Biomechanics and Functional Morphology of Plants—Inspiration for Biomimetic Materials and Structures
During the last decades, biomimetics has attracted increasing attention as well from basic and applied research as from various fields of industry. Biomimetics has a high innovation potential and
Biological Archetypes for Self-Healing Materials
TLDR
An overview of some paradigmatic and well-studied examples of self-repair in living systems is provided, including a number of case studies that provide a detailed description of the structure–function relationships defining the healing mechanism.
Biological Archetypes for Self-Healing Materials Matthew
Damage and fatigue are ever-present facts of life. Given enough time, even the most robust material, whether man-made or natural, succumbs to the deleterious effects of cracks, fissures, and defects
Toward polymer composites based and architectural engineering induced flexible electrodes for lithium-ion batteries
Abstract Recently, polymers, especially conducting (CPs) and non-conducting polymers (nCPs), have been emerged as the promising flexible electrode components for lithium-ion batteries due to their
An Overview of Bioinspired and Biomimetic Self-Repairing Materials
TLDR
The current overview presents a selection of breakthroughs regarding bioinspired or biomimetic self-repairing materials, including the initial basic publications and the recent publications of the last eight years.
...
1
2
3
...

References

SHOWING 1-10 OF 23 REFERENCES
Foaming Power, Bubble Nature, and Sample Density Related to the Expansion Regime in Polyurethane Foams
Foamed polyurethane products were obtained from mixtures of polyolic and isocyanate compounds to which different amounts of water were added. The foaming process was carried out in a special homemade
The influence of shape-holding conditions on shape recovery of polyurethane-shape memory polymer foams
The thermomechanical properties of polyurethane-shape memory polymer (SMP) foams and the influence of shape-holding conditions on shape recovery were investigated experimentally. The results obtained
Self-repairing membranes for inflatable structures inspired by a rapid wound sealing process of climbing plants
A new self-repairing membrane for inflatable light weight structures such as rubber boats or Tensairity® constructions is presented. Inspired by rapid self-sealing processes in plants, a thin soft
Foam Pressure Monitoring as a Method of Studying Demold Characteristics of Appliance Polyurethane Insulation Foam Systems
s appliance industry production rates increase, demold time is a critical concern in the manufacture of refrigerators and freezers using rigid polyurethane foam as the insulation material. If
Measuring the time evolution of the gas pressure in closed cell polyolefin foams produced by compression moulding
The evolution with time of the gas pressure in the cells of low density closed cell polyolefin based foams has been measured using a method that combines mechanical testing and modelling of the
New Determination Method of Flowability and Demolding Properties in Polyurethane Rigid Molded Foams
This paper describes a method of determinating the flowability and demolding property of molded polyurethane rigid foams by the dynamic viscoelasticity spectrometer. In response to periodic
Measuring Pore Diameter Distribution of Gelcast Ceramic Foams from Two‐Dimensional Cross Sections
Increasing applications for gelcast ceramic foams is making the effective, accurate and cost effective measurement of pore diameter and distribution of significant value to a wide range of research
Investigation of the pressure generated in the mould cavity during polyurethane integral skin foam moulding
An industrial scale measuring system was set up to investigate the pressure arising in the mould cavity during polyurethane integral skin foaming. The system is able to measure the pressure arising
Foamed polymers. cellular structure and properties
This survey deals with the fundamental morphological parameters of foamed polymers including size, shape and number of cells, closeness of cells, cellular structure anisotropy, cell size
Finite element modelling of compressive mechanical behaviour of high and low density polymeric foams
In this work, different methodologies were studied by means of finite element modelling (FEM) with the aim of predicting the mechanical behaviour of high and low relative density (ρr) polymeric
...
1
2
3
...