By Mihail Ionescu
Polyurethanes became some of the most dynamic teams of polymers they usually locate use in approximately each point of recent existence, in purposes similar 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 newest Rapra instruction manual: Chemistry and expertise of Polyols for Polyurethanes.
This publication considers the uncooked fabrics used to construct the polyurethane polymeric structure. It covers the chemistry and know-how of oligo-polyol fabrication, the features of many of the oligo-polyol households and the consequences of the oligo-polyol constitution at the houses 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 ebook makes an attempt to hyperlink facts and knowledge about the chemistry and know-how of oligo-polyols for polyurethanes, delivering a finished evaluation of:
This publication might be of curiosity to all experts operating with polyols for the manufacture of polyurethanes and to all researchers that might prefer to understand extra approximately polyol chemistry.
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Extra info for Chemistry and Technology of Polyols for Polyurethane
Seven components, three different oligo-polyols). The correct ratio between the components is assured by the perfectly controlled flow of each component. In this manner, it is possible to use a large range of formulations by simply changing the component flow. This facility assures a high flexibility in the foaming process. All the previous information regarding the general chemistry of polyurethanes and the structure of isocyanates have a role in the better understanding of how the oligo-polyols get chemically inserted in the high MW polyurethane structure and to understand the role played by the polyol structure in the properties of the resulting polyurethanes.
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 . 1%. 6 Primary Hydroxyl Content The terminal hydroxyl groups in the oligo-polyols for polyurethanes are only primary hydroxyl groups or secondary hydroxyl groups [22, 25-34].
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. In the first group there are the low molecular weight (MW) polyols, very well described in organic chemistry, having unitary and concrete MW, such as: propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,4 butanediol, neopentyl glycol, triethanolamine, glycerol, etc.