effect of discontinuous fillers on the morphology and compressive properties of phenolic foams by Robert Edward Steele

Cover of: effect of discontinuous fillers on the morphology and compressive properties of phenolic foams | Robert Edward Steele

Published by s.n.] in [Toronto? .

Written in English

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Subjects:

  • Fillers (Materials),
  • Foam

Edition Notes

Book details

ContributionsToronto, Ont. University.
The Physical Object
Paginationxv, 251 leaves. :
Number of Pages251
ID Numbers
Open LibraryOL18641200M

Download effect of discontinuous fillers on the morphology and compressive properties of phenolic foams

Compressive tests were performed on aluminum foams with different orientations (morphologies) and densities. The compressive stress-strain curve obtained from a 20 cpi foam sample with a density of % (/20/T) is shown in Fig. foam exhibits a small elastic region, followed by a stress plateau, caused by the plastic yielding and bending of cell by: Effect of cell morphology on the compressive properties of open-cell aluminum foams Article in Materials Science and Engineering A () May with Reads How we measure 'reads'.

The effect of alkali treatment on the surface morphology and mechanical properties of coir fibers, interfacial shear strength (IFSS) and mechanical properties of coir fiber/PBS composites was studied. The compressive mechanical properties for several reinforced-phenolic foams reported and the results obtained in this study are summarized in Table increases in compressive mechanical properties by incorporating wood flour and lignin nanoparticle were more evident than cellulose fibers.The addition of wt.% of wood flour to the phenolic foams increased the compressive modulus and Cited by: Low-density Phenolic Syntactic Foams: Processing and Properties Propargyl ether novolac (PN) resins are synthesised by the Williamson's reaction between novolac and propargyl bromide in presence of a base [Bindu et al.,Nair et al., ].

The thermal cure chemistry of PN resin is well established [bNair et al., ]. The effect of filler type and mass percentage on the properties of low-density rigid polyurethane foams at a temperature of 77K was investigated.

The mechanical properties of foams of density kg/m3 filled with milled carbon fibers of average length of and 60 μm and hollow glass microspheres of average diameter of 65 μm were compared. A considerable increase in the Cited by: 2. Novatein® is a patented thermoplastic biopolymer produced from denatured haemoglobin and serum albumin proteins, in blood meal.

This material is biodegradable after processing, and when foamed could provide an alternative to expanded polystyrene and polyurethane for short-term applications such as packaging.

This study aims to investigate the effect of processing temperature on Cited by: 4. In flexible polyurethane foams, the fillers promote an increase in density and resistance to compression. However, they reduce the resiliency and contribute to the increase in permanent deforma-tion.

In addition, properties such as tear strength, for example, are significantly affected by. foams every day, whether it is in packaging, furniture, their car, the insulation of their house or as disposable coffee cups and in many more applications.

Properties Polymer foams are increasingly used because they extend the range of properties for particular requirements. of physical properties. Song et al. studied the effect of viscosity on aluminum structure, pore distribution and pore diameter [10].

Several studies about particles reinforced polymer foams explained the effect of cell morphology change on the mechanical properties. However, the analysis about the effect of particle to cell formation is rare.

Smoldering in Flexible Polyurethane Foams: the Effect of Foam Morphology. of such materials has been limited by the difficulties in obtaining foam samples with consistent and homogeneous properties.

Numerical simulation of smoldering combustion of PUF indicated the significance of oxygen supply on the rate of smolder propagation Cited by: 1. properties of the foams may affect the tribological behavior of the systems.

The aim of this study was to analyze the effect of morphology, mechanical properties and surface free energy on the values of the friction coefficients of orthopedic foams/ artificial skin systems.

File Size: KB. Influences of foaming temperature (i.e. and OC) and blowing agent content on cure characteristics, mechanical and morphological properties of natural rubber (NR) foams were investigated. The blowing agent used in this study was oxybis (benzene sulfonyl) hydrazide (OBSH).

The expandable rubber samples were prepared using a conventional compression molding technique via a heat Cited by: 5. Robert Edward Steele has written: 'The effect of discontinuous fillers on the morphology and compressive properties of phenolic foams' -- subject(s): Fillers (Materials), Foam Asked in Authors.

Brushite foams--the effect of Tween® 80 and Pluronic® F on foam porosity and mechanical properties. Resorbable calcium phosphate based bone void fillers should work as temporary templates for new bone formation. The incorporation of macropores with sizes of µm has been shown to increase the resorption rate of the implant and Cited by: 8.

Robert Edward Steele has written: 'The effect of discontinuous fillers on the morphology and compressive properties of phenolic foams' -- subject(s): Fillers (Materials), Foam Load More Trending.

Phenolic insulation is becoming a popular solution to these problems. Phenolic materials consist of solids mixed with phenolic resin and a surface acting agent. The resulting reaction produces a network of bubbles, which is then cured into a foam.

Phenolic insulation for use in chilled water applications is produced in large buns. Ice-templated (IT) cellulose microfibril porous foams with unique layer structure and controllable channels were successfully fabricated via unidirectional freezing methods.

The cellulose microfibril foam prepared from wt% suspension shows a cross-linked network structure. Increasing the content of the cCited by: The effect of fabrication conditions, such as the liquid to powder ratio and the addition of various setting retardants, on the porosity, microstructure, setting times, and mechanical properties of the foams was also analyzed, to assess the potential clinical applications of brushite by: 8.

Compression Properties and Cellular Structure of Polyurethane Composite Foams Combining Nanoclay and Different Reinforcements. Marcelo Antunes, Álvaro Cano, Vera Realinho, David Arencón, José Ignacio Velasco * Centre Català del Plàstic, Departament de Ciència dels Materials i.

foams, making it impossible to characterize the PU morphology in a particular cell configuration such as cell strut and cell window. Identifying these fea-tures is essential to understand the mechanism of cell opening and various properties of final foam products.

The compressing method involves apply-ing a compressive stress at high. In the study, both experimental work and numerical modeling are performed to investigate the pore size effects on the mechanical properties and deformation behaviours of titanium foams. Cylindrical titanium foam samples with different pore sizes are fabricated through powder metallurgy.

Scanning electron microscope (SEM) is used to determine the pore size, pore distribution and the ratios of Cited by: 5. In the present work we prepared and characterized several polyurethane (PU) composite foams by combining variable concentrations of nanoclay (montmorillonite, MMT) with metal wires or low cost cellulosic-based reinforcements, with the objective of developing multi-scalar rigid foams for structural applications.

The addition of MMT promoted foaming and the formation of finer and more. Polymer nanocomposite foams have received considerable attention because of their potential use in advanced applications such as bone scaffolds, food packaging, and transportation materials due to their low density and enhanced mechanical, thermal, and electrical properties compared to traditional polymer foams.

In this study, silica nanofillers were used as nucleating agents and supercritical Cited by: Á. Oroszlány et al. Compressive Properties of Commercially Available PVC Foams Intended for Use as Mechanical Models for Human Cancellous Bone – 92 – the density of the studied bone samples.

Shepherd et al. [17] used the same method in their study on commercially available PUR foams used as a mechanical model for OP human bones. Investigation of the relationship between morphology and permeability for open-cell foams using virtual materials testing Daniel Westho a, Jakub Skibinskib, Ond rej Sedivy a, Bartlomiej Wysockib,c, Tomasz Wejrzanowskib, Volker Schmidta aUlm University, Institute of Stochastics, Helmholtzstr.

18, Ulm, Germany bWarsaw University of Technology, Faculty of Materials Science and Engineering. This effect was more pronounced in the foams prepared with large L/P [Figures 5 and 6; (a,c,e) vs.

(b,d,f)]. When a smaller amount of powder was added to the liquid foam, there was likely not enough powder present to reduce the drainage of the liquid and both the coalescence of neighboring bubbles and Ostwald ripening could occur to a higher Cited by: 8.

The effect of processing on the entrapment of voids in both fiber-free and fiber-bearing syntactic foam systems is studied. The process modifications for reinforced foam systems decreased the amount of voids.

Foams with different void contents were later on tested for evaluating the compressive by:   The investigated brushite foams show potential for future clinical use, both as bone void fillers and as scaffolds for in vitro bone regeneration Citació Unosson, J., Montufar, E., Engqvist, H., Ginebra, M.P., Persson, C.

Brushite foams - the effect of Tween® 80 and Pluronic® F on foam porosity and mechanical by: 8. MORPHOLOGY EFFECTS O 3 NCONSTITUTIVE PROPERTIES OF FOAMS increase in mid-sized faces while there are fewer small and large faces. The largest faces present in the RSA structures are not to be found in the RCP structures.

At the same time the peak for very small faces remains, even if it is less pronounced. absorption coefficient of polyurethane foams as a porous medium is investigated.

Biot’s equations with transfer matrix m approach selected polyurethane foams. The major issue is the dependency of non acoustic properties on each other which makes difficulties to examine the effect of.

@article{osti_, title = {Mechanical properties and energy absorption characteristics of a polyurethane foam}, author = {Goods, S H and Neuschwanger, C L and Henderson, C and Skala, D M}, abstractNote = {Tension, compression and impact properties of a polyurethane encapsulant foam have been measured as a function of foam density.

Significant differences in the behavior of the foam. The surfactant effect on the properties of the PUF was studied, and it was observed that the cell size of the PUF samples decreased from to μm with an increase in surfactant from 0 to php, respectively.

Choe, K. ; Kim, S. / Mechanical, morphological, and thermal properties of rigid polyurethane foams blown by distilled Cited by: extent to which nanofillers affect foam mechanical properties.

Remarkably, a large number of articles on polymer foams, including Xu et al.1 (Figure 1), do not quote the density of the foams at all. Thus, a quantitative ‘‘normalization’’ for the effect of foam density, or even a qualitative judgment ofFile Size: 6MB.

The physical and mechanical properties of the foams were measured in accordance with the following standards: foam density – DINcompressive strength – DINdimensional stability at 70 °C and relative humidity 95% for 48 h – ISOclosed cell content – ISOand water absorbance after 7 days – DIN mechanical behaviour and failure mechanisms in polymeric syntactic foams huang ruoxuan school of mechanical and aerospace engineering nanyang technological university.

steel metal foams with different relative densities and pores per inch (p.p.i.) were undertaken in the present investigation to determine the effect of microstructural parameters on the relative densities of metal foams. Several elements of the microstructure, such as major and minor cell sizes, cell areas and.

The exotherms of the reactions leading to the formation of polyurethane foams were measured. The inflection points of the exotherm curves were made evident by continuous differentiation with respect to time.

The position and magnitude of the inflection points. The paper aims at the synthesis and characterization of high density rigid Polyurethane Foams (PUF’s). Five varied density PUF’s viz., (, and kg/m 3) have been synthesized at lab standards.

Effects of PUF density on the flexural, edgewise and flat wise compressive strength of the rigid polyurethane foams have been : D M Chinthankumar, K J Jathin, B J Manujesh, K S Umashankar, M R Prajna.

foams and their sound absorbing efficiency, and more specifically the effect of membranes closing the cells. This study is based on the complete characterization of 15 polyurethane foam with various cell sizes and reticulation rates (i.e., open pore content): (i) characterization of.

Item Type: Article: Uncontrolled Keywords: Cell morphology, Cell size, Concentration of, Foam densities, Open-cell, Poly(propylene glycol), Polyurethane Foam.

Water blown rigid polyurethane foams with different functionality were prepared. The physical properties of rigid foams were measured with rotational viscometer (NDJ-1), universal testing machine (Instron), scanning electron microscope (SEM) and differential scanning calorimeter (DSC).

The results show that the viscosity of polyether polyol increases exponentially from 62 mPas to 6 Cited by: Foams are a special type of complex fluids with unusual flow properties. Macroscopically, foams often exhibit a yield stress and aging behavior.

The physical mechanisms are to be sought from the bubble morphology and packing on the microscopic level. We approach the problem from the viewpoint of interfacial fluid dynamics.

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