By Mihail Ionescu
Polyurethanes became probably the most dynamic teams of polymers and so they locate use in approximately each element of contemporary existence, in functions akin to furnishings, bedding, seating and device panels for automobiles, shoe soles, thermoinsulation, carpet backings, packaging, and as coatings.
The major uncooked fabrics used for the construction of polyurethanes are polyols, isocyanates and propylene oxide. the 1st of those is the topic of the newest Rapra instruction manual: Chemistry and expertise of Polyols for Polyurethanes.
This e-book 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 provides the main points of oligo-polyol synthesis, and explains the chemical and physico-chemical subtleties of oligo-polyol fabrication.
This e-book makes an attempt to hyperlink information and data in regards to the chemistry and expertise of oligo-polyols for polyurethanes, delivering a accomplished evaluation of:
This booklet could be of curiosity to all experts operating with polyols for the manufacture of polyurethanes and to all researchers that may prefer to be aware of extra approximately polyol chemistry.
Read Online or Download Chemistry and Technology of Polyols for Polyurethane PDF
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Extra info for Chemistry and Technology of Polyols for Polyurethane
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.
One equivalent weight of an oligo-polyol reacts with one equivalent weight of the diisocyanate (the MW of the isocyanate divided by the number of -NCO groups). The EW of polyols with the same OH# are identical, irrespective of the functionality. 1 mg KOH/g (MW = 2000) and a triol of the same OH# (MW = 3000), have the same EW of 1000. 5 Water Content The water content  is expressed as the percentage of free, nonchemically bound water in the oligo-polyol. The water content is determined by the classical Karl-Fischer method, described, in detail, for oligo-polyols in ASTM D4672  and ISO 14897 .
The acid number is expressed as the number of miligrams of potassium hydroxide required to neutralise the acidity of one gram sample. Acid number is important to correct the value of hydroxyl number, in order to obtain the real value for OH# (for a good correction of the OH# value, the acid number is added to the determined value of OH#). 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 .
Chemistry and Technology of Polyols for Polyurethane by Mihail Ionescu