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Piotr Krol - Linear Polyurethanes: Synthesis Methods, Chemical Structures, Properties and Applications
Published by e-man | Filed under Science & Social Science

Piotr Krol - Linear Polyurethanes: Synthesis Methods, Chemical Structures, Properties and Applications
Brill | 2008 | ISBN: 9004161244 | Pages: 256 | PDF | 4.40 MB
| “ | After having analysed some selected process related issues within polyurethane plastics, I entirely agree with the opinion presented in the monograph by G. Oertel [2] which is known to all skilled in that fi eld. According to that view, the history of polyurethanes may be organised into the following periods of time: years 1937–1962, when the chemical grounds for polyurethanes were studied, the manufacturing methods for the most important feedstocks were learned, and so were the principal production processes for foamed urethanes, elastomers and polyurethane coatings; and years 1963–1987, when further major progress was made in the polyurethane industry, inter alia owing to the RIM method which was just implemented. Late 80’s and the 90’s of the twentieth century—that is the time of further expansion of polyurethane plastics as construction materials predominantly for the automotive and building industries, which became possible after diisocyanate MDI and a vast range of polyethers produced from relatively cheap derivatives of ethylene oxide and propylene oxide were marketed. On the other hand, fi rst serious refl ections were reported in just that period of time on environmental impacts resulting from the use of freons as effi cient but environmentally noxious blowing agents for foamed polyurethanes, and on toxic properties of volatile diisocyanate feedstocks. Moreover, the need was noticed of developing the process(es) for safe utilisation of spent polyurethane foams—it is just polyurethane foams and foamed elastomers that make about 80 % of the produced volume of polyurethane plastics. New kinds of diisocyanates, more resistant to photo-degradation, were also marketed at that time, like IPDI and HMDI, which made some outlets for polyurethanes (lacquers and coatings) even more attractive. |
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