Results 251 to 260 of about 105,720 (304)

Formaldehyde levels in homes insulated with urea-formaldehyde foam

Environmental Monitoring and Assessment, 1982
Twenty seven UFFI homes in Colorado and Wisconsin were sampled for formaldehyde levels. The formaldehyde concentrations found in these homes averaged 0.059 ppm. Two homes were monitored for an extended period to determine the impact of ambient climatic conditions.
W C, Schutte, R S, Cole, K R, Long, C W, Frank   +3 more
openaire   +2 more sources

Urea–Formaldehyde and Melamine–Formaldehyde Polymers

1989
According to Meyer1 the history of urea–formaldehyde (UF) resins can be divided into five different periods: (i) Synthesis of the raw materials urea and formaldehyde. This period started with the synthesis of urea by Wohler in 1824. Formaldehyde was first recognized by Butlerov in 1859 when attempting to synthesize methanediol.
Dietrich Braun, Hans-Josef Ritzert
openaire   +1 more source

Epoxy resin modified urea formaldehyde and silicon urea formaldehyde as microwave absorbers

2008 International Conference on Recent Advances in Microwave Theory and Applications, 2008
In recent days, various microwave absorbers are used for electromagnetic interference and compatibility measurements in anechoic and semi-anechoic chambers. The authors have synthesized three different polymer composites of epoxy resin modified by urea formaldehyde and silicon urea formaldehyde of different wt%.
M. Murugan, V.K. Kokate, A.A. Athawale, M.H.M. Alhousami   +3 more
openaire   +1 more source

Electrophoretic ink using urea-formaldehyde microspheres

Journal of Microencapsulation, 2006
A kind of electronic ink, which is supported on indium-tin-oxide (ITO) glass before polymerization, is prepared using urea and formaldehyde resin as wall materials, in which TiO(2) modified with PMMA are dispersed in tetrachloroethylene (TCE) using a mixture of oil blue dyes and charge control additive (span80).
Y T, Wang, X P, Zhao, D W, Wang
openaire   +2 more sources

Colloidal aggregation of aminoplastic polycondensation resins: Urea–formaldehyde versus melamine–formaldehyde and melamine–urea–formaldehyde resins

Journal of Applied Polymer Science, 2006
AbstractColloidal particles formation followed by their clustering have been shown to be the normal way of ageing of aminoplastic resins, namely urea–formaldehyde (UF) resins, melamine–formaldehyde (MF) resins, and melamine–urea–formaldehyde (MUF) resins. Ageing or further advancement of the resin by other means such as longer condensation times causes
A. Despres, A. Pizzi
openaire   +1 more source

Formaldehyde and urea formaldehyde cavity wall insulation

Structural Survey, 1984
Formaldehyde and UF foam cavity wall insulation Urea formaldehyde (UF) foam cavity wall insulation was introduced into this country, from Denmark, in 1959. Relatively little was installed until after the oil crisis which followed the Arab‐Israeli War of 1973. In total, some 1.5 million buildings have been insulated with it.
openaire   +1 more source

Formaldehyde Release From Urea-Formaldehyde Bonded Wood Products

The Journal of Adhesion, 1985
Abstract During the past decade significant progress has been made in reducing formaldehyde release from UF-bonded wood products. The purpose of this work was to test formaldehyde release from medium density fibreboard (MDF) manufactured in a commercial pilot plant using seven different UF resins with molar ratios between 1.85 and 1.05 that were ...
B. Meyer, K. Hermanns, D. C. Smith
openaire   +1 more source

Physical gelation of water‐borne thermosetting resins by percolation theory—Urea‐formaldehyde, melamine‐urea‐formaldehyde, and melamine‐formaldehyde resins

Journal of Polymer Science Part B: Polymer Physics, 2008
AbstractPercolation and effective‐medium theories are applied for calculating the connectivity threshold of colloid particles of given shapes, observed during the physical gelation, distinguished from chemical gelation, of aminoplastic resins. The rigidity threshold, being the critical solid fraction at which a rigid network is first formed, was also ...
Celzard, A., Pizzi, Antonio, Fierro, V.
openaire   +2 more sources

Pyrolysis of melamine–formaldehyde and urea–formaldehyde resins

Journal of Applied Polymer Science, 1991
AbstractPyrolysis of melamine–formaldehyde and urea–formaldehyde resins in helium and air was investigated by means of TG and gravimetry with isothermal heating, as well as elemental and HCN analyses. Weight loss curves suggest three kinds of reactions involved in the pyrolysis, namely, initiation reactions, reactions splitting off volatile fragments ...
Toshimi Hirata, Sumire Kawamoto, Akio Okuro   +2 more
openaire   +1 more source

Nickel ferrocyanide as a high-performance urea oxidation electrocatalyst

Nature Energy, 2021
Yao Zheng, Hui Su, Mietek Jaroniec
exaly