By Mihail Ionescu
Polyurethanes became essentially the most dynamic teams of polymers they usually locate use in approximately each point of contemporary existence, in purposes comparable to furnishings, bedding, seating and tool panels for vehicles, shoe soles, thermoinsulation, carpet backings, packaging, and as coatings.
The major uncooked fabrics used for the creation of polyurethanes are polyols, isocyanates and propylene oxide. the 1st of those is the topic of the most recent Rapra instruction manual: Chemistry and expertise of Polyols for Polyurethanes.
This ebook considers the uncooked fabrics used to construct the polyurethane polymeric structure. It covers the chemistry and expertise of oligo-polyol fabrication, the features of some of the oligo-polyol households and the results of the oligo-polyol constitution at the homes of the ensuing polyurethane. It offers the main points of oligo-polyol synthesis, and explains the chemical and physico-chemical subtleties of oligo-polyol fabrication.
This publication makes an attempt to hyperlink info and knowledge in regards to the chemistry and expertise of oligo-polyols for polyurethanes, supplying a finished assessment of:
This booklet may be of curiosity to all experts operating with polyols for the manufacture of polyurethanes and to all researchers that might prefer to recognize extra approximately polyol chemistry.
Read or Download Chemistry and Technology of Polyols for Polyurethane PDF
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Additional info for Chemistry and Technology of Polyols for Polyurethane
23. Kunststoffe Plast Europe, 1997, 87, 9, 6. 24. G. V. I. Kuzaev, Reactive Oligomers, Brill Publishers, Moscow, Russia, 1988. 25. D. , Lugoa, Rio de Janeiro, 2002. br/. 26. F. D. R. 1, Rapra Technology, Shrewsbury, UK, 1994. 27. G. Wegener, M. Brandt, L. Duda, J. Hofmann, B. Klesczewski, D. Koch, R-J. Kumpf, H. Orzesek, H-G. Pirkl, C. Six, C. Steinlein and M. Weisbeck, Applied Catalysis, 2001, 221, 1-3, 303. 28. , E. Müller, O. Bayer, H. Meerwein and K. 57. 29. V. Oprea and V. 399. indb 30 24/2/06 11:16:11 am The General Characteristics of Oligo-Polyols 3 The General Characteristics of Oligo-Polyols Author Polyols used in polyurethane manufacture are divided from the structural point of view in two groups.
1 mg KOH/g. For some polyols, such as polyester polyols or reactive flame retardants, the maximum acidity accepted is around 2 mg KOH/g. Acid number in polyols is determined according to ASTM D4662 . 11). Of course, some oligo-polyols have specific and particular characteristics and these special characteristics will be presented in detail for each group of oligo-polyol.
10. A broad MWD represents a large number of macromolecules which have a wide distribution of molecular weights. The MWD of oligo-polyols is currently determined by GPC using tetrahydrofuran as solvent . 10 General aspect of the oligo-polyols MWD curves A narrow MWD shows that the majority of molecular species are situated in a very narrow interval of polymerisation degree. The extremely narrow MWD polymers, called monodisperse polymers (all the macromolecules have the same molecular weight), are very difficult to obtain by synthetic methods.
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