Thermal Stability and Flame Retardancy of Rigid Polyurethane Foams/Organoclay Nanocomposites

2008 ◽  
Vol 47 (11) ◽  
pp. 1136-1141 ◽  
Author(s):  
Zhongbin Xu ◽  
Xiling Tang ◽  
Jinyang Zheng
Keyword(s):  
Thermal Stability ◽  
Flame Retardancy ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams

scholarly journals Rigid Polyurethane Foams Modified with Biochar

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5616
Author(s):  
Katarzyna Uram ◽  
Maria Kurańska ◽  
Jacek Andrzejewski ◽  
Aleksander Prociak
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Thermal Insulation ◽  
Foam Cells ◽  
Polyurethane Foams ◽  
Cross Sectional ◽  
Rigid Polyurethane Foams ◽  
Insulation Materials

This paper presents results of research on the preparation of biochar-modified rigid polyurethane foams that could be successfully used as thermal insulation materials. The biochar was introduced into polyurethane systems in an amount of up to 20 wt.%. As a result, foam cells became elongated in the direction of foam growth and their cross-sectional areas decreased. The filler-containing systems exhibited a reduction in their apparent densities of up to 20% compared to the unfilled system while maintaining a thermal conductivity of 25 mW/m·K. Biochar in rigid polyurethane foams improved their dimensional and thermal stability.

Effect of aluminum diethylphosphinate on the thermal stability and flame retardancy of flexible polyurethane foams

2019 ◽  
Vol 106 ◽  
pp. 72-79 ◽  
Author(s):  
Xin Wang ◽  
Ping Zhang ◽  
Zunchu Huang ◽  
Weiyi Xing ◽  
Lei Song ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Flame Retardancy ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

New, thermally stable, rigid polyurethane foams based on polyols obtained using morpholine-2,3-dione derivatives

2018 ◽  
Vol 54 (4) ◽  
pp. 719-741 ◽  
Author(s):  
Iwona Zarzyka ◽  
Anita Bialkowska ◽  
Tomasz Paczesniak ◽  
Wieslaw Fracz ◽  
Dorota Majda
Keyword(s):  
Thermal Stability ◽  
Mechanical Strength ◽  
Operating Temperature ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
Thermally Stable ◽  
Insulating Materials ◽  
Research Results ◽  
Rigid Polyurethane Foams

In this work, the research results of the synthesis and properties of the polyols with the oxamidoester group, obtained in the reaction of N-substituted morpholine-2,3-dione derivatives with excess of alkylene carbonates have been presented. Using these derivatives as polyol components, rigid foamed polyurethane materials of high thermal stability and mechanical strength have been obtained. New polyurethane foams obtained using hydroxypropyl morpholine-2,3-dione derivatives can be used as heat-insulating materials of operating temperature as high as 150°C.

The effects of N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol on the flame retardancy and physical–mechanical properties of rigid polyurethane foams

2018 ◽  
Vol 36 (6) ◽  
pp. 535-545 ◽  
Author(s):  
Daikun Jia ◽  
Yi Tong ◽  
Jin Hu
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Flame Retardancy ◽  
Cone Calorimeter ◽  
Oxygen Index ◽  
Polyurethane Foams ◽  
Initial Decomposition Temperature ◽  
Limiting Oxygen Index ◽  
Rigid Polyurethane Foams ◽  
Upper Limit

Flame-retardant rigid polyurethane foams incorporating N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol have been prepared. After adding N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol, the density and compressive strength of the polyurethane foams were seen to decrease. The flame retardancy of the polyurethane foams has been characterized by limiting oxygen index, upper limit–94, and cone calorimeter tests. The polyurethane foam with 2.27 wt% N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol gave a highest limiting oxygen index of 33.4%, and the peak heat release rate of polyurethane foam reduced to 19.5 kW/m2 from 47.6 kW/m2 of PU-0 without N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol. Upper limit–94 revealed N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol did not change the burning rating, and all polyurethane foams had passed V-0 rating. The thermal stability of polyurethane foams has been investigated by thermogravimetric analyzer. N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol significantly increased the initial decomposition temperature of polyurethane foams and their residues. In addition, the morphology of residual char from the flame-retarded polyurethane foams after cone calorimeter tests has also been characterized by digital photographs. The results indicated that N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol significantly enhanced the strength and compatibility of the char layer formed by the polyurethane foams. These results indicate that N,N-(pyromellitoyl)-bis-l-phenylalanine diacid ester glycol can improve both the quality and quantity of the char, which has a significant effect on the flame-retardant properties of the foam.

scholarly journals Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 686 ◽  
Author(s):  
Yongjun Chen ◽  
Yuanfang Luo ◽  
Xiaohui Guo ◽  
Lijuan Chen ◽  
Tiwen Xu ◽  
...  
Keyword(s):  
Flame Retardancy ◽  
Photoelectron Spectroscopy ◽  
Oxygen Index ◽  
Optical Microscope ◽  
Carbon Layer ◽  
Polyurethane Foams ◽  
Limit Oxygen Index ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foams ◽  
Blending Method

In this paper, rigid polyurethane foams that were filled with expandable graphite (RPUF/EG) composites were prepared by the liquid blending method, and then the structure and flame retardancy performance of materials were investigated through optical microscope, scanning electron microscope, limit oxygen index, cone calorimeter, thermogravimetric analysis coupled to fourier transform infrared spectrum, and X-ray photoelectron spectroscopy. The results showed that a large number of EG could be good to the exhibition of flame retardancy of RPUF, where the optimal material was found at loading 15 phr EG that showed an increased limit oxygen index value and a decreased calorific or fuming value. TGA coupled FTIR and XPS revealed that EG could disassembled before RPUF under heating treatment, and it could form a pyknotic and enahnced residual carbon layer on RPUF surface after the fire, which restricted the transfer of gas, like oxygen or heat into PU matrix, finally resulting in the promotion of flame retardancy of RPUF.

New polyols with isocyanuric structure by thiol-ene “click” chemistry reactions

2016 ◽  
Vol 53 (6) ◽  
pp. 639-662 ◽  
Author(s):  
Ram K Gupta ◽  
M Ionescu ◽  
X Wan ◽  
D Radojcic ◽  
N Bilic
Keyword(s):  
Mechanical Properties ◽  
Click Chemistry ◽  
Flame Retardancy ◽  
Reaction Rates ◽  
Polyurethane Foams ◽  
Storage Tanks ◽  
Rigid Polyurethane Foams ◽  
High Yields ◽  
Pu Foams ◽  
Very High

New polyols with isocyanuric structure were synthesized by thiol-ene “click” chemistry of triallyl isocyanurate with 1-thioglycerol and 2-mercaptoethanol. The synthesized polyols, prepared with high reaction rates and in very high yields, were chemically and structurally characterized. These polyols were used for the preparation of rigid polyurethane foams with excellent physical–mechanical properties and inherent flame retardancy. By alkoxylation of isocyanuric polyols with propylene oxide and/or ethylene oxide in a self-catalytic process, odorless polyols with lower hydroxyl numbers and lower viscosities were obtained, leading to PU foams with good properties, but without inherent flame retardancy. The synthesized polyols with isocyanuric structure are suitable for the preparation of all types of rigid polyurethane foams, including thermoinsulation of freezers, buildings, storage tanks and pipes for the food and chemical industry, for packaging, and as wood substitutes.

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