Structure-property relationships of flexible polyurethane foams

Dounis, Dimitrios V.; Wilkes, Garth L.

doi:10.1016/s0032-3861(97)85620-0

Cited by 93 publications

(62 citation statements)

References 6 publications

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“…The amine produced in this reaction reacts with additional isocyanate to produce rigid urea groups which, when of sufficient size and concentration, phase separate into urea rich domains (hard segment domains) primarily due to hydrogen bonding with additional urea groups. The hard segment domains (structure, order, concentration) play a very important role on the final structure, morphology, and properties of the foam (Dounis and Wilkes 1997). The reaction product between the isocyanate and multifunctional polyol is a urethane group which links the urea groups to the other soft segments (Dieterich and uhlig 1992).…”

Section: Methodsmentioning

confidence: 99%

Statistical properties of microcracking in polyurethane foams under tensile test, influence of temperature and density

et al. 2006

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International audienceWe report tensile failure experiments on polyurethane (PU) foams. Experiments have been performed by imposing a constant strain rate. We work on heterogeneous materials for whom the failure does not occur suddenly and can develop as a multistep process through a succession of microcracks that end at pores. The acoustic energy and the waiting times between acoustic events follow power-law distributions. This remains true while the foam density is varied. However, experiments at low temperatures (PU foams more brittle) have not yielded power-laws for the waiting times. The cumulative acoustic energy has no power law divergence at the proximity of the failure point which is qualitatively in agreement with other experiments done at imposed strain. We notice a plateau in cumulative acoustic energy that seems to occur when a single crack starts to propagate

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Section: Methodsmentioning

confidence: 99%

Statistical properties of microcracking in polyurethane foams under tensile test, influence of temperature and density

et al. 2006

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“…Due to the great industrial importance of polyurethanes, the chemistry of isocyanates has been extensively studied [7][8][9][10]. In polyurethane polymerization, a compound containing two or more isocyanate groups per molecule reacts with a polyol or a polyfunctional alcohol [5].…”

Section: Introductionmentioning

confidence: 99%

Rigid and semi rigid polyurethane resins: A structural investigation using DMA, SAXS and Le Bail method

Trovati

Sanches

Souza

et al. 2014

Journal of Molecular Structure

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“…This is caused by their unparallel performance characteristics, i.e., vibration damping, sound insulation, energy and shock absorption, shape conformance, consumer comfort and protection from impact. These characteristics result from a specific open cell structure of flexible foams, which is built of struts and plateau borders [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis of Polyols from Rapeseed Oil and Properties of Flexible Polyurethane Foams

2012

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Abstract:The application of raw materials derived from renewable feedstock has given rise to growing interest recently, as it can be exploited for the production of bio-based materials from vegetable oils. Their availability, biodegradability and low prices have been taken into account. In this work, vegetable oil-based polyols as a prospective replacement for petroleum polyols were investigated. A two-stage method for polyol preparation by incomplete epoxidation of natural oils and subsequent complete oxirane ring opening under microwave irradiation is presented. The course of epoxidation and oxirane ring-opening process was determined analytically by an evaluation of iodine, epoxy and hydroxyl values. The samples of oils and their derivatives were also analyzed by FT-IR and characterized by size exclusion chromatography (SEC) in order to calculate their functionalities. Finally, polyols with two different hydroxyl values were obtained and used for the synthesis of flexible polyurethane (PUR) foams. The scope of this research includes the determination of the relationship between the rapeseed oil-based polyol content and the properties of the resulting materials. It was found that applying bio-based polyols in conjunction with petroleum-based polyols for PUR foams formulations resulted in materials with good mechanical properties and a higher number of cells with smaller dimensions.

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Structure-property relationships of flexible polyurethane foams

Cited by 93 publications

References 6 publications

Statistical properties of microcracking in polyurethane foams under tensile test, influence of temperature and density

Statistical properties of microcracking in polyurethane foams under tensile test, influence of temperature and density

Rigid and semi rigid polyurethane resins: A structural investigation using DMA, SAXS and Le Bail method

Microwave-Assisted Synthesis of Polyols from Rapeseed Oil and Properties of Flexible Polyurethane Foams

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