Rigid polyurethane foam based on modified vegetable oil

Soybean oil and castor oil were modified and used to prepare rigid polyurethane foam with similar properties to a commercial foam used for thermal insulation applications. Soybean oil was firstly modified according to a peracid method, using formic acid and hydrogen peroxide to yield a formiated soy...

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Veröffentlicht in:Journal of applied polymer science 2011-04, Vol.120 (1), p.530-537
Hauptverfasser: Veronese, Vinícius B, Menger, Rodrigo K, Forte, Maria Madalena de C, Petzhold, Cesar L
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container_issue 1
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container_title Journal of applied polymer science
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creator Veronese, Vinícius B
Menger, Rodrigo K
Forte, Maria Madalena de C
Petzhold, Cesar L
description Soybean oil and castor oil were modified and used to prepare rigid polyurethane foam with similar properties to a commercial foam used for thermal insulation applications. Soybean oil was firstly modified according to a peracid method, using formic acid and hydrogen peroxide to yield a formiated soy polyol. Furthermore, transesterification was performed with a polyfunctional alcohol to increase OH-functionality. Castor oil, which has hydroxyl groups in the molecular structure, was only transesterified. The vegetable polyols were characterized by OH-number, Brookfield viscosity, differential scanning calorimetry, and size exclusion chromatography. The foams were prepared at constant NCO/OH ratio (1.2 : 1) by the hand mix method and poured into a closed steel box. They were characterized using scanning electron microscopy, thermogravimetric analysis, and dynamic mechanical analysis. The apparent density and the compression strength of foams were determined, respectively, by the mass/volume relation and through the table tensile tester. After modification, the polyols reached an OH-number between 393 and 477 mg KOH/g oil, showing a low viscosity and molecular weight, allowing the preparation of a rigid vegetable foam with an apparent density of 50 ± 1 kg/m³ and compression strength around 200 kPa.
doi_str_mv 10.1002/app.33185
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subjects Applied sciences
Bulk density
Castor oil
Cellular
Compressive strength
Exact sciences and technology
Foams
Forms of application and semi-finished materials
Materials science
mechanical properties
Polymer industry, paints, wood
Polymers
Polyols
Polyurethane foam
soybean oil
Soybeans
Technology of polymers
thermal properties
Vegetables
title Rigid polyurethane foam based on modified vegetable oil
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