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 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.

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.

Investigation of Physical, Mechanical and Thermal Properties of Building Wall Materials

2017 ◽  
Vol 751 ◽  
pp. 521-526 ◽  
Author(s):  
Jiraphorn Mahawan ◽  
Somchai Maneewan ◽  
Tanapon Patanin ◽  
Atthakorn Thongtha
Keyword(s):  
Compressive Strength ◽  
Thermal Properties ◽  
Water Absorption ◽  
Calcium Silicate Hydrate ◽  
Lightweight Concrete ◽  
Physical And Mechanical Properties ◽  
Mechanical And Thermal Properties ◽  
Thermal Insulating ◽  
Building Wall ◽  
Wall Materials

This research concentrates to the effect of changing sand proportion on the physical, mechanical and thermal properties of building wall materials (Cellular lightweight concrete). The density, water absorption and compressive strength of the 7.0 cm x 7.0 cm x 7.0 cm concrete sample were studied. It was found that there are an increase of density and a reduction of water absorption with an increase of sand content. The higher compressive strength can be confirmed by higher density and lower water absorption. The physical and mechanical properties of lightweight concrete conditions conformed to the Thai Industrial Standard 2601-2013. The phases of CaCO3 and calcium silicate hydrate (C-S-H) in the material indicate an important factor in thermal insulating performance.

MECHANICAL AND THERMAL PROPERTIES OF SAWDUST CONCRETE

2017 ◽  
Vol 79 (6) ◽  
Author(s):  
Ruhal Pervez Memon ◽  
Abdul Rahman Mohd. Sam ◽  
A. S. M. Abdul Awal ◽  
Lemar Achekzai
Keyword(s):  
Heat Transfer ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Properties ◽  
Lightweight Concrete ◽  
Physical And Mechanical Properties ◽  
Developing Nations ◽  
Mechanical And Thermal Properties ◽  
Construction Technology ◽  
Long Duration

 Industrialization in developing countries has resulted in an increase in agricultural output and consequent accumulation of unmanageable agro wastes. Pollution arising from such wastes is a matter of concern for many developing nations. The aim of this study is to investigate the behavior of lightweight concrete and the utilization of sawdust as waste material in concrete. This paper focuses on the manufacturing of concrete which possess long duration heat transfer by using sawdust waste. In this research, cement to sawdust ratio of 1:1, 1:2 and 1:3 by volume was prepared for sawdust concrete, and the ratio of sand was kept constant that is 1. At these ratios, the mechanical and thermal properties like density, workability, strength and heat transfer were measured after, 7, 28 and 56 days of air curing. The tests results show that with the increase in the amount of sawdust, the workability, compressive strength, tensile strength and flexural strength decreased. It also resulted in reduction of heat transfer of sawdust concrete. Taking into account the overall physical and mechanical properties, sawdust concrete can be used in construction technology. 

scholarly journals Anti-flammability, mechanical and thermal properties of bio-based rigid polyurethane foams with the addition of flame retardants

RSC Advances ◽  
2020 ◽  
Vol 10 (53) ◽  
pp. 32156-32161
Author(s):  
Guangyu Zhang ◽  
Xiaoqi Lin ◽  
Qinqin Zhang ◽  
Kaisen Jiang ◽  
Weisheng Chen ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Flame Retardant ◽  
Flame Retardants ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams ◽  
Flame Retardant Properties

Bio-based rigid polyurethane foams with the addition of flame retardant exhibit preferable flame-retardant properties.

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.

Evaluation of the physical, chemical, mechanical, and thermal properties of steam-cured PET/polyester cured-in-place pipe

2019 ◽  
Vol 53 (19) ◽  
pp. 2687-2699 ◽  
Author(s):  
Md Nuruddin ◽  
Gamini P. Mendis ◽  
Kyungyeon Ra ◽  
Seyedeh Mahboobeh Teimouri Sendesi ◽  
Tyler Futch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Outer Layer ◽  
Flexural Modulus ◽  
Physical And Mechanical Properties ◽  
Organic Chemical ◽  
Mechanical And Thermal Properties ◽  
Volatile Organic

Cured-in-place pipe (CIPP), a popular trenchless technology, has gained wide attention for drinking water, sewerage and storm water pipe rehabilitation because of its ease of installation. Here, the physical and thermal properties of steam-cured PET felt/polyester resin CIPPs were studied. 1H NMR and GC-MS analysis was performed to identify the unreacted volatile organic compounds in cured CIPPs and results were compared to uncured resin and laboratory cured liner characterizations. Results indicated that organic chemicals in cured CIPP altered the mechanical properties and may be leached out with water. Significantly, lower porosity, density and amount of unreacted volatile organic compounds were much less in the CIPP's inner layer as compared to its outer layer. Water conditioning was conducted to investigate the influence of water on CIPP physical and mechanical properties. No changes were observed for density and porosity for either the CIPP's inner and outer layer; however, the flexural modulus increased slightly due to unreacted organic chemical leaching from the CIPPs.

Mechanical and Thermal Properties of High-Density Rigid Polyurethane Foams from Renewable Resources

2016 ◽  
Vol 4 (1) ◽  
pp. 86-100 ◽  
Author(s):  
M. Kirpluks ◽  
U. Cabulis ◽  
A. Ivdre ◽  
M. Kuranska ◽  
M. Zieleniewska ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Renewable Resources ◽  
Polyurethane Foams ◽  
High Density ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams
Sign in / Sign up

Export Citation Format

Share Document