scholarly journals POSS Compounds as Modifiers for Rigid Polyurethane Foams (Composites)

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1092 ◽  
Author(s):  
Anna Strąkowska ◽  
Sylwia Członka ◽  
Krzysztof Strzelec
Keyword(s):  
Mechanical Properties ◽  
Viscoelastic Behavior ◽  
Physical And Mechanical Properties ◽  
Large Cell ◽  
Processing Parameters ◽  
Polyurethane Foams ◽  
Bending Test ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Rigid Polyurethane Foams ◽  
Cell Shapes

Three types of polyhedral oligomeric silsesquioxanes (POSSs) with different functional active groups were used to modify rigid polyurethane foams (RPUFs). Aminopropylisobutyl-POSS (AP-POSS), trisilanoisobutyl-POSS (TS-POSS) and octa(3-hydroxy-3-methylbutyldimethylsiloxy-POSS (OH-POSS) were added in an amount of 0.5 wt.% of the polyol weight. The characteristics of fillers including the size of particles, evaluation of the dispersion of particles and their effect on the viscosity of the polyol premixes were performed. Next, the obtained foams were evaluated by their processing parameters, morphology (Scanning Electron Microscopy analysis, SEM), mechanical properties (compressive test, three-point bending test, impact strength), viscoelastic behavior (Dynamic Mechanical Analysis, DMA), thermal properties (Thermogravimetric Analysis, TGA, thermal conductivity) and application properties (contact angle, water absorption). The results showed that the morphology of modified foams is significantly affected by the fillers typology, which resulted in inhomogeneous, irregular, large cell shapes and further affected the physical and mechanical properties of the resulting materials. RPUFs modified with AP-POSS represent better mechanical properties compared to the RPUFs modified with other POSS.

scholarly journals Composites of Rigid Polyurethane Foams Reinforced with POSS

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 336 ◽  
Author(s):  
Sylwia Członka ◽  
Anna Strąkowska ◽  
Krzysztof Strzelec ◽  
Agnieszka Adamus-Włodarczyk ◽  
Agnė Kairytė ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Water Absorption ◽  
Viscoelastic Behavior ◽  
Physical And Mechanical Properties ◽  
Polyurethane Foams ◽  
Bending Test ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams ◽  
Cell Shapes

Rigid polyurethane foams (RPUFs) were successfully modified with different weight ratios (0.5 wt%, 1.5 wt% and 5 wt%) of APIB-POSS and AEAPIB-POSS. The resulting foams were evaluated by their processing parameters, morphology (Scanning Electron Microscopy analysis, SEM), mechanical properties (compressive test, three-point bending test and impact strength), viscoelastic behavior (Dynamic Mechanical Analysis, DMA), thermal properties (Thermogravimetric Analysis, TGA, and thermal conductivity) and application properties (contact angle, water absorption and dimensional analysis). The results showed that the morphology of modified foams is significantly affected by the type of the filler and filler content, which resulted in inhomogeneous, irregular, large cell shapes and further affected the physical and mechanical properties of resulting materials. RPUFs modified with APIB-POSS represent better mechanical and thermal properties compared to the RPUFs modified with AEAPIB-POSS. The results showed that the best results were obtained for RPUFs modified with 0.5 wt% of APIB-POSS. For example, in comparison with unfilled foam, compositions modified with 0.5 wt% of APIB-POSS provide greater compression strength, better flexural strength and lower water absorption.

scholarly journals Physical and Mechanical Properties of Rigid Polyurethane Faoms Modified with Selected Flame Retardants or Layered Silicates

2011 ◽  
Vol 20 (3) ◽  
pp. 096369351102000 ◽  
Author(s):  
Łukasz Piszczyk ◽  
Magdalena Danowska ◽  
Michał Strankowski ◽  
Iwona Gibas ◽  
Józef Tadeusz Haponiuk
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Flame Retardants ◽  
Layered Silicate ◽  
Physical And Mechanical Properties ◽  
Processing Parameters ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
X Ray Diffraction ◽  
X Ray

The flame retardants: expandable graphite, decabromodiphenyloxid, triethylphosphate and nanofillers: natural montmoryllonite [MMT] – Nanofil®116, natural MMT modified with a quaternary ammonium salt - Cloisite®10A, synthetic layered silicate – Laponite®RD has been used in rigid polyurethane foams (PUFs). The influence of fillers amounts on processing parameters, physical–mechanical properties (compression strength, density, water absorption, brittleness, mass loss and volume change) and thermal properties (thermal stability and storage modulus in DMA methods) of such foams has been analysed. The morphology has been characterized by X-ray diffraction and scanning electron microscopy (SEM). The X-ray diffraction of the polyurethane nanocomposite foams has been indicated the partial exfoliation of the clay in the polyurethane matrix. The flame retardancy and the thermal stability of all polyurethane modified systems was improved by an addition of flame retardants or nanoclays. Best results, in comparison for pure polyurethane foam, was obtained for polyurethane modified with organically modified montmorillonite (Cloisite 10A).

scholarly journals New Flame Retardant Systems Based on Expanded Graphite for Rigid Polyurethane Foams

2020 ◽  
Vol 10 (17) ◽  
pp. 5817 ◽  
Author(s):  
Anna Strąkowska ◽  
Sylwia Członka ◽  
Piotr Konca ◽  
Krzysztof Strzelec
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquid ◽  
Flame Retardant ◽  
Construction Materials ◽  
Great Influence ◽  
Expanded Graphite ◽  
Polyurethane Foams ◽  
Bending Test ◽  
Maximum Temperature ◽  
Rigid Polyurethane Foams

The effect of the addition of new flame retardant systems on the properties of rigid polyurethane (RPUF) foams, in particular, reduction in flammability, was investigated. The modification included the introduction of a flame retardant system containing five parts by weight of expanded graphite (EG) (based on the total weight of polyol), one part by weight of pyrogenic silica (SiO2) and an ionic liquid (IL): 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim] [BF4]), in an amount of 3:1 with respect to the weight of added silica. The kinetics of the synthesis of modified foams—including the growth rate and the maximum temperature—were determined and the physicochemical properties, such as the determination of apparent density and structure by optical microscopy, mechanical properties such as impact strength, compressive strength and, three-point bending test were determined. An important aspect was also to examine the thermal properties such as thermal stability or flammability. It has been shown that for rigid polyurethane foams, the addition of expanded graphite in the presence of silica and ionic liquid has a great influence on the general use properties. All composites were characterized by reduced flammability as well as better mechanical properties, which may contribute to a wider use of rigid polyurethane foams as construction materials.

Morphology and Mechanical Properties of Nylon-1010-filled Rigid Polyurethane Foams

2004 ◽  
Vol 36 (4) ◽  
pp. 333-349 ◽  
Author(s):  
Bo Yin ◽  
Zhong-Ming Li ◽  
Hui Quan ◽  
Ming-Bo Yang ◽  
Qiu-Ming Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Nylon 1010 ◽  
Morphology And Mechanical Properties

Thermo Mechanical behaviour of Phenol Novolac Resin and Unsaturated Polyester Toughened Epoxy using nano Bentonite and Silica Nanoparticles

2020 ◽  
Vol 1 (3) ◽  
pp. 77-83
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Silica Nanoparticles ◽  
Moisture Absorption ◽  
Unsaturated Polyester ◽  
Physical And Mechanical Properties ◽  
Bending Test ◽  
Mechanical And Thermal Properties ◽  
Novolac Epoxy ◽  
Industrial Needs

Phenol novolac epoxy resin is a polymer matter which its properties can be modified for industrial needs. In this research, nanocomposites of phenol novolac epoxy resin and unsaturated polyester are made nano Bentonite and silica nanoparticles as filler. For this purpose, effect of nanoparticles percent on nanocomposite formation is studied and their physical, mechanical and thermal properties are obtained. The presence of unsaturated polyester in this process forms a cross-link capable of improving the physical and mechanical properties of epoxy resin. Fracture behavior was determined by a SEM device. Moreover, TGA, DSC, impact tests and bending test were applied for data analysis. When process ability is growing, moisture absorption decreases. Fracture toughness was also evaluated in a stoichiometric network. Physical and mechanical properties improve significantly with increasing nanoparticles. The most important reason for using this nanocomposite is its high resistance to corrosion.

Preparation of rigid polyurethane foams with powder filler

2012 ◽  
Vol 32 (2) ◽  
Author(s):  
Joanna Paciorek-Sadowska ◽  
Bogusław Czupryński ◽  
Joanna Liszkowska ◽  
Kazimierz Piszczek
Keyword(s):  
Compressive Strength ◽  
Polyvinyl Chloride ◽  
Softening Point ◽  
Processing Parameters ◽  
Polyurethane Foams ◽  
Favorable Effect ◽  
Start Time ◽  
Rigid Polyurethane Foams ◽  
Powder Filler ◽  
Foam Plastics

Abstract The diversified properties of polyurethane (PUR) foam plastics result from differences in the receipts applied during their preparation. The preparation of rigid polyurethane-polyisocyanurate foams (PUR-PIR) with application of different amounts of polyvinyl chloride (PVC) s-70 as a filler is described in this study. It was found that application of PVC s-70 has an effect on the prolongation of processing parameters, i.e., start time and, to a greater extent, expansion and gelation times. Moreover, it was found that introduction of filler into the foam composition causes a reduction in the capacity of the foam to absorb water; however, a distinct change in the amount of closed cells in comparison with standard foam was not observed. A favorable effect of filler on brittleness and flammability of PUR-PIR foams (significant reduction) as well as on compressive strength and softening point (a significant increase in these values) was observed.

Effect of Processing Parameters on the Properties of Glass–Ceramics from Arc-Melting Slag of Incineration Fly Ash

2011 ◽  
Vol 399-401 ◽  
pp. 864-868
Author(s):  
Han Qiao Liu ◽  
Guo Xia Wei ◽  
Yin Liang ◽  
Jun Lan Yang
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Milling Time ◽  
Bending Strength ◽  
Compaction Pressure ◽  
Glass Ceramics ◽  
Physical And Mechanical Properties ◽  
Processing Parameters ◽  
Arc Melting ◽  
Melting Slag

The glass-ceramics were made of arc-melting slag from incinerator fly ash mixed with glass cullet additive by sintering method. The effects of ball milling time and powder compaction pressure on the microstructure, physical and mechanical properties of the glass–ceramics were respectively investigated. Results showed that with milling time delaying, granularity of the parent glass evidently reduces, the major phases of glass–ceramics have no change but the diffraction peaks present intensive trend, the crystal sizes of glass–ceramics decrease, the properties such as volumetric densities, compressive strength, bending strength and toughness are improved, the appropriate milling time is 6h with fifty percent of the volume (d50 value) of 10.62μm. The physical and mechanical properties first increase and then decrease with compaction pressure increasing, and the optimal compaction pressure is 60MPa.

Tailoring Mechanical Properties of Rigid Polyurethane Foams by Sorbitol and Corn Derived Biopolyol Mixtures

2015 ◽  
Vol 3 (12) ◽  
pp. 3382-3387 ◽  
Author(s):  
Lorena Ugarte ◽  
Sandra Gómez-Fernández ◽  
Cristina Peña-Rodrı́uez ◽  
Aleksander Prociak ◽  
Maria Angeles Corcuera ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams

Surface-modifiers of clay on mechanical properties of rigid polyurethane foams/organoclay nanocomposites

2007 ◽  
Vol 105 (5) ◽  
pp. 2988-2995 ◽  
Author(s):  
Zhongbin Xu ◽  
Xiling Tang ◽  
Aijuan Gu ◽  
Zhengping Fang ◽  
Lifang Tong
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Surface Modifiers
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