Chemistry - Morphology - Properties

A comprehensive overview on the topic of Polyurethanes
Berend Eling, Wolfgang Friederichs
246 pages
144 colored illustrations and 40 b/w tables
paperback
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246 pages
144 colored illustrations and 40 b/w tables
paperback
ISBN-13: 9783110744569
€ 65.37 (plus. 7% German VAT, if applicable)
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This book, written by Berend Eling and our editor in chief Dr. Wolfgang Friederichs, discusses the synthesis of isocyanates and polyols, along with their polymerization, linking the structures of the starting components to the polymer morphology and mechanical properties of the resulting polymers. It provides a fundamental introduction to polymer physics, processing, and foam formation while focusing on three main applications of polyurethane: low-density rigid foam, low-density flexible foam, and elastomers. The book is suitable for graduate students in chemistry, materials science, and industrial chemistry, as well as for those new to the polyurethanes industry.
Prof. Dr. Berend Eling earned his PhD in polymer chemistry from the University of Groningen in 1984 and spent nearly 40 years in R&D at ICI (now Huntsman) and BASF Polyurethanes. He became a senior principal scientist at BASF and an honorary professor of polymer chemistry at the University of Hamburg.
Dr. Wolfgang Friederichs earned his PhD in organic chemistry from the University of Cologne in 1985. Subsequently, he joined Bayer Material Science, where he led the global polyurethane product research group. After leaving the industry in 2014, he became the editor-in-chief of PU Magazine.
If you want to have quick look into the book, open these sample pages:
| Chp. | Title | page |
|---|---|---|
| 1 | Introduction | 1 |
| 1.1 | Historical background | 3 |
| 1.2 | Polyurethane market | 5 |
| References | 8 | |
| 2 | Starting components | 9 |
| 2.1 | Polyisocyanates | 9 |
| 2.2 | Polyether polyols | 23 |
| 2.3 | Polyester polyols | 32 |
| 2.4 | Bio-based polyols | 35 |
| 2.5 | Hydroxyl value and equivalent mass | 37 |
| 2.6 | Diamines and polyamines | 38 |
| 2.7 | Additives | 40 |
| References | 46 | |
| 3 | Polyurethane chemistry | 47 |
| 3.1 | Reactivity of the isocyanate group | 47 |
| 3.2 | Isocyanate reactions with active hydrogen compounds | 49 |
| 3.3 | Isocyanate-isocyanate reactions | 58 |
| 3.4 | PU system technology | 63 |
| 3.5 | Chain topology and polymer morphology | 66 |
| 3.6 | Rheology and cure | 71 |
| 3.7 | Structure development and reaction rate | 73 |
| References | 79 | |
| 4 | Physical properties and flammability | 81 |
| 4.1 | General thermal behavior of polymers | 81 |
| 4.2 | Viscoelasticity | 84 |
| 4.3 | Dynamic mechanical analysis | 87 |
| 4.4 | Melting of the hard domains | 89 |
| 4.5 | Burning behavior and flame protection | 93 |
| References | 97 | |
| 5 | Processing | 98 |
| 5.1 | Prepolymer process and one-shot method | 98 |
| 5.2 | Discontinuous and continuous processing | 98 |
| 5.3 | Low-pressure processing | 100 |
| 5.4 | High-pressure processing | 101 |
| 5.5 | RIM technology | 102 |
| 5.6 | Equipment | 104 |
| References | 110 | |
| 6 | Foam formation | 111 |
| 6.1 | Simultaneous formation of polymer and foam | 111 |
| 6.2 | Aeration and nucleation | 113 |
| 6.3 | Bubble growth | 115 |
| 6.4 | Fine-cell rigid foams | 122 |
| 6.5 | Foam properties | 123 |
| References | 124 | |
| 7 | Rigid foams | 125 |
| 7.1 | Rigid foam formulations | 125 |
| 7.2 | Glass transition temperature | 129 |
| 7.3 | Foam formation | 131 |
| 7.4 | Properties | 134 |
| 7.5 | Applications and processing | 147 |
| References | 157 | |
| 8 | Flexible foams | 159 |
| 8.1 | Foam properties | 161 |
| 8.2 | Flexible foam formulations | 164 |
| 8.3 | Polymer topology and morphology | 166 |
| 8.4 | Manufacturing of open-cell foam | 169 |
| 8.5 | Morphology and polymer hardness | 174 |
| 8.6 | Compression hardness | 176 |
| 8.7 | Ball rebound resilience, hysteresis, and loss factor | 179 |
| 8.8 | MDI versus TDI technology | 179 |
| 8.9 | Processing | 181 |
| 8.10 | Technical foams | 185 |
| References | 188 | |
| 9 | Elastomers | 190 |
| 9.1 | Elastomer starting materials and formulations | 191 |
| 9.2 | Chain topology | 194 |
| 9.3 | Polymer morphology | 196 |
| 9.4 | Effect of processing on morphology | 208 |
| 9.5 | Performance-related tests | 212 |
| 9.6 | Mechanical properties | 214 |
| 9.7 | Applications | 218 |
| References | 222 | |
| 10 | Sustainability and outlook | 224 |
| 10.1 | Improved carbon footprint of PU starting materials | 224 |
| 10.2 | Emission and odor | 225 |
| 10.3 | Insulation | 226 |
| 10.4 | Recycling of PU | 226 |
| 10.5 | Epilogue | 227 |
| References | 228 | |
| 11 | Symbols and abbreviations | 229 |
| 12 | Unit conversion tables | 233 |
| 13 | Calculations | 236 |
| 13.1 | Basic equations | 236 |
| 13.2 | Worked examples | 237 |
| 13.3 | Average functionality of a polyol mixture | 238 |
| 13.4 | Hard block content of an elastomer | 238 |
| Index | 241 |
Polyurethanes are well—established materials. With an annual production volume of 25 million metric tons, they belong to the commercially most important specialty polymers. Polyurethanes are widely used as flexible foam for furniture, rigid foam for insulation, and various elastomer applications such as shoe soles and steering wheels. The manufacturing of polyurethanes from liquid reactive components enables the production of low—density cellular materials, and the wide variety of starting components allows for a broad spectrum of properties, ranging from rigid and glassy to soft and elastomeric. The vast spectrum of polyurethanes and the large variety of available starting materials introduce a high level of complexity, requiring a basic fundamental understanding of their structure—property relationships.
A master course at the University of Hamburg, Institute of Technical and Macromolecular Chemistry, Germany, 2010, aimed to teach the basics of polyurethanes. The present textbook is an extended version of this course. It is especially suited for master courses at universities and polytechnics, as well as for newcomers working in research and development within the polyurethanes industry.
This textbook approaches the subject from an application viewpoint. It provides a fundamental understanding of the required basic organic, physical, and polymer chemistry and links the starting materials to the polymer morphology and mechanical properties of polyurethanes. Keeping the book down to a manageable size, we concentrated on the three main applications: low-density rigid and flexible foams and elastomers.
Our special thanks go to Dr. Günter Scholz for bringing us together and establishing contact with the publisher. We thank Prof. Almut Stribeck and Dr. Mengyu Zhang for critically reading parts of the manuscript. We are very much indebted to BASF Polyurethanes and Covestro for allowing us to present some data on physical properties. Sincere thanks are given to AutoR1M Ltd, BASF—Polyureth- anes, Bucher Hydraulics GmbH, Cannon S.p.A., Covestro AG, DESMA Schuhmaschinen GmbH, Graco Inc., Hennecke GmbH, KraussMaffei Technologies GmbH, Ottobock SE & Co. KGaA, Prüfinstitut Hoch, puren GmbH, SPFA (Spray Polyurethane Foam Alliance), Soudal N.V., and SATRA Technology for providing pictures that illustrate the processing, properties, and polyurethane applications.
Spring 2025
Berend Eling
Wolfgang Friederichs