Effects of the addition of LiCl, LiClO4, and LiCF3SO3 salts on the chemical structure, density, electrical, and mechanical properties of rigid polyurethane foam composite

2011 ◽  
Vol 51 (6) ◽  
pp. 1137-1144 ◽  
Author(s):  
L. Verdolotti ◽  
S. Colini ◽  
G. Porta ◽  
S. Iannace
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Chemical Structure ◽  
Rigid Polyurethane Foam ◽  
Foam Composite ◽  
Structure Density

scholarly journals The effect of oil palm trunk particles and composite density on the physical and mechanical properties of rigid polyurethane foam composite

2021 ◽  
Vol 891 (1) ◽  
pp. 012003
Author(s):  
S S Munawar ◽  
C D Widyanto ◽  
L S Hutahean ◽  
D Purnomo ◽  
B Subiyanto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Oil Palm ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Rigid Polyurethane Foam ◽  
Oil Palm Trunk ◽  
Foam Composite ◽  
Screw Withdrawal ◽  
Closed Mold

Abstract The oil palm trunk (OPT) particle was used as a filler for the manufacture of rigid polyurethane foam composites (RPUFC). The purpose of this research is to investigate the effect of OPT particle content and variation of composite density on the physical and mechanical properties of RPUFC. The RPUFC was created with five different volume fractions of OPT particles (0, 2.5, 5, 7.5, 10 wt%) and three different composite densities (40, 50, 60 kg/m3). The OPT particles, polyols, and isocyanate were mixed, poured and formed in a closed mold. The moisture content (MC), water absorption (WA), compressive strength (CS), screw withdrawal (SW), and internal bonding strength (IB) properties were determined according to JIS A 5908-2003. The flexural strength (FS) properties were determined according to ASTM D790. The physical properties (MC, WA) were increased with increasing OPT particles in the RPUFC. The RPUFC with 2.5% OPT particle was higher in modulus of rupture, modulus of young and CS values compared to RPUFC control. The IB and SW values were increased when 2.5% OPT particles were added to RPUFC. The best PURFCs were produced with the addition of 2.5% particles at a density of 50 and 60 kg/m3.

Cell Morphology and Mechanical Properties of Rigid Polyurethane Foam

2005 ◽  
Vol 41 (3) ◽  
pp. 267-285 ◽  
Author(s):  
Michelle Cameron Hawkins ◽  
Brendan O’Toole ◽  
Dacia Jackovich
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Cell Morphology ◽  
Rigid Polyurethane Foam ◽  
Morphology And Mechanical Properties

scholarly journals Influence of carbon nanotubes on mechanical properties and structure of rigid polyurethane foam

2014 ◽  
Vol 64 ◽  
pp. 012007
Author(s):  
E Ciecierska ◽  
M Jurczyk-Kowalska ◽  
P Bazarnik ◽  
M Kulesza ◽  
M Lewandowska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polyurethane Foam ◽  
Rigid Polyurethane Foam

Effect of Kenaf Fiber on Morphology and Mechanical Properties of Rigid Polyurethane Foam Composite

2017 ◽  
Vol 888 ◽  
pp. 188-192 ◽  
Author(s):  
Nur Suhaili Mohd Soberi ◽  
Rozyanty Rahman ◽  
Firuz Zainuddin
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Cell Shape ◽  
Kenaf Fiber ◽  
Kenaf Core ◽  
Foam Composite ◽  
The Matrix ◽  
Sem Micrograph ◽  
Core Fiber ◽  
Irregular Cell

In this work polyurethane foam composites were prepared by using kenaf core fiber as filler at different percentages. Polyurethane foam acts as the matrix and was prepared by using palm oil based polyol and isocyanate with ratio of 1:1.1. From the results obtained, composites filled with kenaf core fiber showed lower mechanical properties i.e modulus and compression strength, up to 85% decrease. However the addition of kenaf core fiber decreases the rise time of the polyurethane foam composites. SEM micrograph analysis showed the evidence of irregular cell shape with the presence of kenaf core fiber. The percentage of kenaf core fiber plays crucial role in determining the composites properties.

scholarly journals Bio-Based Rigid Polyurethane Foam Composites Reinforced with Bleached Curauá Fiber

2021 ◽  
Vol 22 (20) ◽  
pp. 11203
Author(s):  
Sylwia Członka ◽  
Eduardo Fischer Kerche ◽  
Roberta Motta Neves ◽  
Anna Strąkowska ◽  
Krzysztof Strzelec
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Cellular Structure ◽  
Cell Structure ◽  
Rigid Polyurethane Foam ◽  
Processing Times ◽  
Civil Aircraft ◽  
Viscoelastic Characteristics ◽  
Vegetable Fiber ◽  
Curauá Fiber

This study aims to evaluate the influence of using a bleached Curauá fiber (CF) as filler in a novel rigid polyurethane foam (RPUF) composite. The influence of 0.1, 0.5 and 1 wt.% of the reinforcements on the processing characteristics, cellular structure, mechanical, dynamic-mechanical, thermal, and flame behaviors were assessed and discussed for RPUF freely expanded. The results showed that the use of 0.5 wt.% of CF resulted in RPUF with smoother cell structure with low differences on the processing times and viscosity for the filled pre-polyol. These morphological features were responsible for the gains in mechanical properties, in both parallel and perpendicular rise directions, and better viscoelastic characteristics. Despite the gains, higher thermal conductivity and lower flammability were reported for the developed RPUF composites, related to the high content of cellulose and hemicellulose on the bleached CF chemical composition. This work shows the possibility of using a Brazilian vegetable fiber, with low exploration for the manufacturing of composite materials with improved properties. The developed RPUF presents high applicability as enhanced cores for the manufacturing of structural sandwich panels, mainly used in civil, aircraft, and marine industries.

scholarly journals Preparation of Polypyrrole/Polyurethane Foam Composite Material

2020 ◽  
Vol 28 (3(141)) ◽  
pp. 69-73
Author(s):  
Yuanjun Liu ◽  
Wenyue Li ◽  
Christopher Kick ◽  
Xiaoming Zhao ◽  
Haiying Wu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Composite Material ◽  
Polyurethane Foam ◽  
Sem Images ◽  
Continuous Layer ◽  
Pu Foam ◽  
Foam Composite ◽  
Scanning Electron

Firstly, the paper focused on the polyurethane foam soaking process with pyrrole solution, and discuss the estimated electro-mechanical properties of the modified PU foam. Secondly, scanning electron microscopy (SEM) micrographs were collected to understand the polypyrrole distribution inside the foam. The results show that the chemical polymerisation parameters needed to realise this amount of polypyrrole in the foam were 0.1 mol/L of pyrrole, a mole ratio of 1:2.25, an oxidation temperature of 12 ± 3 °C, and an oxidation time of 2 hours. SEM images of the samples prepared with the modified approach showed a continuous layer of about 10-15 μm thickness of the polypyrrole attached to the surface of the PU foam.

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