By Mihail Ionescu
Polyurethanes became essentially the most dynamic teams of polymers and so they locate use in approximately each element of contemporary lifestyles, in purposes corresponding to furnishings, bedding, seating and device panels for autos, 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 ebook 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 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 publication makes an attempt to hyperlink info and data in regards to the chemistry and know-how of oligo-polyols for polyurethanes, supplying a accomplished assessment of:
This ebook could be of curiosity to all experts operating with polyols for the manufacture of polyurethanes and to all researchers that will prefer to be aware of 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
Sample text
The most usual and practical method for functionality determination is based on the assessment of the MW of an oligo-polyol, by a method applicable to low MW compounds (MW < 10,000 daltons), such as vapour pressure osmometry (VPO) or gel permeation chromatography (GPC), together with hydroxyl number determination. 5) where x1 and x2 are the molar ratios of each oligo-polyol in the mixture and f1 and f2 are the functionalities of the corresponding oligo-polyols. 8. 8 General structure of an octol (oligo-polyol with eight hydroxyl groups/mol) The average functionality of a complex mixture of polyols may be calculated in a simple manner, by dividing the total number of hydroxyl groups by the total number of molecules.
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.
The most usual and practical method for functionality determination is based on the assessment of the MW of an oligo-polyol, by a method applicable to low MW compounds (MW < 10,000 daltons), such as vapour pressure osmometry (VPO) or gel permeation chromatography (GPC), together with hydroxyl number determination. 5) where x1 and x2 are the molar ratios of each oligo-polyol in the mixture and f1 and f2 are the functionalities of the corresponding oligo-polyols. 8. 8 General structure of an octol (oligo-polyol with eight hydroxyl groups/mol) The average functionality of a complex mixture of polyols may be calculated in a simple manner, by dividing the total number of hydroxyl groups by the total number of molecules.