Chemistry and Technology of Polyols for Polyurethanes by Mihail Ionescu

By Mihail Ionescu

''The building more and more calls for items which are good value and simple to take advantage of, to allow quickly tune program while reaching a excessive actual functionality. Incorporating a polymer in a cementitious combine brings key merits, relatively when it comes to workability, abrasion and influence resistance, with the ensuing actual and chemical houses established upon the character of the polymer fabric and the volume utilized in relation to the cement part.

This Rapra guide is meant to supply an perception into the makes use of of polymers in the building undefined. It describes the perception of polymer-modified cementitious fabrics via to the array of polymer-based or polymer-modified fabric utilised in modern-day building.

It not just covers using polymers in direct mix with cement yet polymer concrete, impregnation of polymers into the concrete substrate and different polymer-based items, (i.e., coatings and adhesives). either normal and artificial polymers are reviewed.

This e-book is geared toward all people who find themselves operating with cement, and in addition at a person who wishes additional info approximately this such a lot flexible of fabrics, supplying perception into:

  • the universal polymers utilized in cementitious fabrics
  • polymer concrete
  • polymer Portland cement concrete
  • reinforcement utilizing artificial fibres
  • adhesives and coatings ''
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    Oertel, Hanser Verlag, Munich, Germany, 1985. 17. M. Buist, Applied Science Publishers, London, UK, 1978. 18. H. Ulrich, Reaction Polymers, Hanser Publishers, New York, NY, USA, 1992. 19. R. Sayigh, H. J. K. W. 231. 20. J. B. Staley, Wiley Interscience, New York, NY, USA, 1969, Volume 16, Part III, High Polymers. 21. W. Woods, Flexible Polyurethane Foams, Chemistry and Technology, Applied Science Publishers, Englwood, NJ, USA, 1982. 28 Basic Chemistry of Polyurethanes 22. H. I. 448. 23. Kunststoffe Plast Europe, 1997, 87, 9, 6.

    1 Hydroxyl Percentage Hydroxyl percentage (%OH) is another form of expressing the concentration of hydroxyl groups in any polyol. The sum of the atomic weights in the OH groups is 16 + 1 = 17 g/OH group. Hydroxyl percentage is defined as the gravimetric percentage of all the hydroxyl groups in an oligo-polyol molecule: f •17 f •17 = f • 56100 M OH # OH # %OH = 33 %OH = The hydroxyl percentage is easily obtained by dividing the hydroxyl number (OH#) by 33. 12% hydroxyl groups. 2 Functionality Functionality is the second important characteristic of an oligo-polyol and is defined as the number of hydroxyl groups/molecule of oligo-polyol.

    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. [In Romanian] 29 Chemistry and Technology of Polyols for Polyurethanes 30 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.

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