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.

Preparation and properties of polyurethane foams from hydroxypropoxy derivatives of urea and isocyanates

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Iwona Zarzyka-Niemiec ◽  
Katarzyna Rydel
Keyword(s):  
Thermal Stability ◽  
Propylene Carbonate ◽  
Water Uptake ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
Diphenylmethane Diisocyanate ◽  
Rigid Polyurethane Foams ◽  
Molar Excess ◽  
Derivatives Of

AbstractThe products of hydroxyalkylation of N,N’-bis(2-hydroxypropyl)urea (BHPU) with large molar excess of propylene carbonate (PC) posses enhanced thermal stability. These products and 4,4’-diphenylmethane diisocyanate were used as substrates for obtaining rigid polyurethane foams, which had high thermal stability and low water uptake.

scholarly journals Improved thermally stable oligoetherols from 6-aminouracil, ethylene carbonate and boric acid

2019 ◽  
Vol 17 (1) ◽  
pp. 1080-1086
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Boric Acid ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
H Nmr ◽  
Maldi Tof ◽  
Instrumental Methods

AbstractSyntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.

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.

Porphyrinated polyimide honeycomb films with high thermal stability for HCl gas sensing

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 30472-30477 ◽  
Author(s):  
Fu-Wen Lin ◽  
Xiao-Ling Xu ◽  
Ling-Shu Wan ◽  
Jian Wu ◽  
Zhi-Kang Xu
Keyword(s):  
Thermal Stability ◽  
Gas Sensing ◽  
High Thermal Stability ◽  
Thermally Stable ◽  
Hcl Gas ◽  
Excellent Property

Thermally stable films with ordered pores are fabricated from porphyrinated polyimides and they exhibit excellent property in HCl gas sensing.

High Resistivity GaN Formed by Ion Implantation

2000 ◽  
Vol 639 ◽  
Author(s):  
Jun Kudo ◽  
Yuji Hishida ◽  
Masanori Watanabe ◽  
Tomoaki Hatayama ◽  
Takashi Fuyuki
Keyword(s):  
Thermal Stability ◽  
Ion Implantation ◽  
High Frequency ◽  
High Thermal Stability ◽  
High Resistivity ◽  
Thermally Stable ◽  
Active Elements ◽  
High Frequency Devices ◽  
Underlying Substrate

ABSTRACTAdvanced high frequency devices using GaN-based semiconductor require the technology to form high resistivity regions with high thermal stability to electrically isolate the active elements from surroundings, as well as from the underlying substrate. The present paper describes the preparation of thermally stable, high resistivity GaN layers by ion implantation. It was confirmed that C or Zn implantation yielded high resistivity layers. In particular, Zn implantation yielded the layers with resistivity on the order of 1010 cm, which could be sustained at temperatures as high as 1000.

DESIGN AND SYNTHESES OF HIGHLY EFFICIENT AND THERMALLY-STABLE IMIDAZOLE CHROMOPHORES BEARING DIAMINO GROUPS FOR NONLINEAR OPTICS

2005 ◽  
Vol 14 (01) ◽  
pp. 61-65 ◽  
Author(s):  
WEI WU ◽  
ZHAOLI ZHANG ◽  
XIAOYUN ZHANG
Keyword(s):  
Thermal Stability ◽  
Charge Transfer ◽  
Nonlinear Optics ◽  
Second Order ◽  
High Thermal Stability ◽  
Transfer System ◽  
Thermally Stable ◽  
Highly Efficient ◽  
Nlo Materials ◽  
Good Transparency

Four imidazole type chromophores bearing diamino groups were designed and synthesized with a facile method. All the chromophores possess efficient second-order nonlinearities based on MOPAC/AM1 calculation, high thermal stability and good transparency for the application in NLO materials. Chromophore 1d, an X-type dual charge transfer system, shows well-balanced nonlinearity/transparency properties.

Thermophysical and physical-mechanical properties of the modernized industrial PVC-plastic compound

2021 ◽  
pp. 84-93
Author(s):  
T. A. Borukaev ◽  
R. M. Martazanova
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Heat Release ◽  
Hydrogen Chloride ◽  
High Thermal Stability ◽  
Heat Of Combustion ◽  
Zinc Borate ◽  
Insulating Materials ◽  
Operational Characteristics

Compounds based on PVC-plasticate of I40-13A grade, zinc borate, antimony and chalk oxide have been obtained. The thermal stability, thermophysical and operational properties of the obtained compounds have been investigated. It was found that the modernized compounds have high thermal stability values that meet the requirements for insulating materials. It is shown that the obtained compounds have low values of heat release, heat of combustion, smoke formation and release of hydrogen chloride. It was found that the operational characteristics of the modernized PVC cable compounds are improved.

Sign in / Sign up

Export Citation Format

Share Document