Open-Cell Aliphatic Polyurethane Foams with High Content of Polysaccharides: Structure, Degradation, and Ecotoxicity

2021 ◽  
Author(s):  
Kateřina Skleničková ◽  
Věra Vlčková ◽  
Sabina Abbrent ◽  
Sonia Bujok ◽  
Aleksandra Paruzel ◽  
...  
Keyword(s):  
Polyurethane Foams ◽  
Open Cell ◽  
Structure Degradation

Mechanical and sound absorption properties of open-cell polyurethane foams modified with rock wool fiber

2021 ◽  
pp. 103872
Author(s):  
Behzad Mohammadi ◽  
Amir Ershad-Langroudi ◽  
Gholamreza Moradi ◽  
Abdolrasoul Safaiyan ◽  
Peymaneh Habibi
Keyword(s):  
Sound Absorption ◽  
Polyurethane Foams ◽  
Wool Fiber ◽  
Absorption Properties ◽  
Open Cell ◽  
Rock Wool

Preparation of open cell rigid polyurethane foams and modified with organo-kaolin

2019 ◽  
Vol 56 (4) ◽  
pp. 435-447
Author(s):  
Guojian Wang ◽  
Tao Yang
Keyword(s):  
Compressive Strength ◽  
Polyurethane Foam ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Polyurethane Foams ◽  
Compressive Property ◽  
Rigid Polyurethane Foam ◽  
Open Cell ◽  
Silane Coupling ◽  
Cell Opening

The open cell rigid polyurethane foam (ORPUF) was prepared by adding chemical cell openers including O-500 and AK-9903. The FTIR results of cell openers and open cell rate of ORPUFs showed that O-500 has more effective cell opening capacity. In the ORPUF foaming formulation using O-500 as cell opener, silane coupling agent (KH-550) modified kaolin (organo-kaolin) was introduced into ORPUF with different weight loadings. The cellular morphology, apparent density, and compressive strength of the foams were tested in order to investigate the effects of organo-kaolin on the open cell rate and compressive property of the foams. The results showed that the open cell rate of ORPUFs slightly increased from 83.9% to 92.9% with the content of organo-kaolin. Meanwhile, compared to neat ORPUF, the compressive strength of foams increased by 72.8% when the content of introduced organo-kaolin was 4 parts per hundred of polyol by mass (php).

scholarly journals Stiffness, Energy Dissipation, and Hyperelasticity in Hierarchical Multilayer Composite Nanocoated Open‐Cell Polyurethane Foams

2019 ◽  
Vol 21 (12) ◽  
pp. 1900459 ◽  
Author(s):  
Francesca Cura' ◽  
Raffaella Sesana ◽  
Xiao-Chong Zhang ◽  
Fabrizio Scarpa ◽  
Wen Jiang Lu ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Polyurethane Foams ◽  
Multilayer Composite ◽  
Open Cell

FEM Modeling of Failure of a Foam Single Cell

2010 ◽  
Vol 165 ◽  
pp. 400-403 ◽  
Author(s):  
Wiesław Szymczyk ◽  
Danuta Miedzińska
Keyword(s):  
Effective Properties ◽  
Failure Process ◽  
Polyurethane Foams ◽  
Fem Modeling ◽  
Open Cell ◽  
Rail Vehicles ◽  
Open Cell Foam ◽  
Different Types ◽  
Open Cell Foams ◽  
Energy Absorbing

. The paper deals with the numerical analysis of foam materials. Open cell foam is investigated. Numerical simulations enable prediction of failure process and assessment of effective properties of the modeled foam structures [1]. Metal as well as polyurethane foams exhibit interesting properties. They are light, possess good acoustic and/or magnetic isolation, have ability to absorb energy of vibration and impacts [2]. They are used for sandwich panels, hit absorbers (i.e. as elements of buffer constructions in rail vehicles), fillers of construction parts, bodies of vehicles (i.e. floating combat vehicles), dividing walls on vessels and others. Specially prepared open cell foams demonstrate auxetic properties [3] and shape memory effect [4]. Such materials are very good for seats in aircrafts, which may protect pilots and passengers during crashes and restrict heavy backbone injuries. Foams are also applied for filtering purposes. Foams themselves or in combination with different types of fillers (i.e. elastomers) or ceramic reinforcement may be used for impact energy absorbing panels for military purposes (protection against explosion shock wave and splinters).

scholarly journals Open-cell polyurethane foams based on modified used cooking oil

Polimery ◽  
2020 ◽  
Vol 65 (03) ◽  
pp. 216-225 ◽  
Author(s):  
Maria Kuranska ◽  
Krzysztof Polaczek ◽  
Monika Auguscik-Krolikowska ◽  
Aleksander Prociak ◽  
Joanna Ryszkowska
Keyword(s):  
Polyurethane Foams ◽  
Open Cell ◽  
Cooking Oil ◽  
Used Cooking Oil

scholarly journals A Pathway toward a New Era of Open-Cell Polyurethane Foams—Influence of Bio-Polyols Derived from Used Cooking Oil on Foams Properties

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5161
Author(s):  
Maria Kurańska ◽  
Elżbieta Malewska ◽  
Krzysztof Polaczek ◽  
Aleksander Prociak ◽  
Joanna Kubacka
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Foam Cell ◽  
Polyurethane Foams ◽  
Cell Content ◽  
Open Cell ◽  
New Era ◽  
Used Cooking Oil ◽  
Coefficient Of Thermal Conductivity ◽  
Cooking Oils

In order to create greener polyurethane (PUR) foams, modified used cooking oils (UCO) were applied as starting resources for the synthesis of bio-polyols. The bio-polyols were produced using transesterification of UCO with diethylene glycol (UCO_DEG) and triethanolamine (UCO_TEA). Next, open-cell PUR foams were synthesized by replacing 20, 40, 60, 80 and 100% of the petrochemical polyol with the bio-polyol UCO_DEG or UCO_TEA. It was observed that an increasing bio-polyol content (up to 60%) led to an increase of the closed cell content. However, a further increase in the bio-polyol content up to 100% resulted in foam cell opening. The bio-foams obtained in the experiment had an apparent density of 13–18 kg/m3. The coefficient of thermal conductivity was determined at three different average temperatures: 10, 0 and −10 °C. The PUR bio-foams modified with bio-polyol UCO_TEA had lower values of thermal conductivity, regardless of the average temperature (35.99–39.57 mW/m·K) than the foams modified with bio-polyol UCO_DEG (36.95–43.78 mW/m·K). The compressive strength of most of the bio-foams was characterized by a higher value than the compressive strength of the reference material (without bio-polyol). Finally, it was observed that the bio-materials exhibited dimensional stability at 70 °C.

scholarly journals Correction: High piezo-resistive performances of anisotropic composites realized by embedding rGO-based chitosan aerogels into open cell polyurethane foams

Nanoscale ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 10556-10556
Author(s):  
Tianliang Zhai ◽  
Letizia Verdolotti ◽  
Saulius Kaciulis ◽  
Pierfrancesco Cerruti ◽  
Gennaro Gentile ◽  
...  
Keyword(s):  
Polyurethane Foams ◽  
Open Cell

Correction for ‘High piezo-resistive performances of anisotropic composites realized by embedding rGO-based chitosan aerogels into open cell polyurethane foams’ by Tianliang Zhai et al., Nanoscale, 2019, 11, 8835–8844.

Development and Characterization of SS316L Foam Prepared by Powder Metallurgy Route

2014 ◽  
Vol 534 ◽  
pp. 31-37 ◽  
Author(s):  
Fazimah Mat Noor ◽  
Khairur Rijal Jamaluddin ◽  
Sufizar Ahmad ◽  
Rosdi Ibrahim ◽  
Noor Idayu Mad Rosip
Keyword(s):  
Powder Metallurgy ◽  
Pore Size ◽  
Bone Cells ◽  
Cell Structure ◽  
Average Pore Size ◽  
Polyurethane Foams ◽  
Vacuum Furnace ◽  
Average Pore ◽  
Open Cell ◽  
Replication Method

Open cell foams, made on the basis of polyurethane foams replication method are well known and had been widely used since decades. The advantage of the network-like metal foams is it exhibits a natural bone-like structure which enables ingrowth of bone cells and blood vessels. The aim of the present study is to develop SS316L foam with an open cell structure by using powder metallurgy routes via foam replication method. The SS316L slurry was produced by mixing SS316L powder with Polyethylene Glycol (PEG), Methylcellulose (CMC) and distilled water. The composition of the SS316L powder in the slurry was varied from 40 to 60 wt. %. Then, polymeric foam template was impregnated in SS316L slurry and dried at room temperature. Sintering was carried out in a high temperature vacuum furnace at 1300°C. The microstructure of the SS316L foam produced was observed by Scanning Electron Microscope (SEM) and the elemental analysis was carried by Energy Dispersive X-ray (EDX). It was found that pore size are within 200-400μm and the average pore size is 293μ. The detected elements in the SS316L foam were C, Al, Ca, O, Cr, Fe, Mo, Ni and Si.

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