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Bibliography Includes bibliographical references and index. Introduction Chapter 2.
Blowing Agents for Polyurethane Foams
Chemical Origin of Blowing Agents 2. Mechanisms of Action of Blowing Agents 3. Parameters of Foaming 5. Foaming Efficiency Measures 7. Additives Effect of Foaming on Physical-mechanical Properties of Foams Analytical Techniques Useful in Foaming Summary "A variety of foaming techniques and equipment are available to produce very diverse range of products. Several monographic sources are available to learn about these methods of production but very little is known and discussed about the composition of materials to be processed and additives enhancing foamed products and making the foam production more economical.
Sign up to take part. Rigid polyurethane foams PUFs were prepared from polymeric 4,4-diphenylmethane diisocyanate PMDI and polyether polyol with amine catalyst. Water was used as the chemical blowing agent and, cyclopentane and hydrofluorocarbon HFC were used as the physical blowing agents.
The kinetic rate of forming the PUF increased with the catalyst and water content.
The cell size of the PUF sample decreased with increasing amount of the blowing and gelling catalysts. In the case of the PUF sample blown by water only, the amount of the blowing catalyst had no significant influence on the density and the compressive strength of the PUF sample.ransmohydre.ml
Handbook of Polymer Foams - PDF Free Download
In the case of the PUF sample prepared with using HFC or cyclopentane as the blowing agent, however, as the amount of the blowing catalyst increased, the density and the compressive strength of the PUF sample increased. The PUF sample blown by the physical blowing agent had smaller cell size than the PUF sample blown by the chemical blowing agent, if compared at same density.
This result suggests that the low thermal conductivity of the PUF sample blown by mixed blowing agent is due to the increase in the structural stability of the PUF foams. Access provided by.
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