Polyurethanes

Chemistry - Morphology - Properties

Polyurethanes

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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Description:

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.

  • The physicochemical aspects of the polymerization reactions are clearly presented.
  • The relationships between structure and properties are explained in terms of foam density, as well as the glass transition and melting temperatures of the polymer.

Authors

Berend ElingProf. 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.


Wolfgang FriederichsDr. 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.


Sample pages

If you want to have quick look into the book, open these sample pages:

Polyurethane chemistry
Processing
Properties


Table of contents

Chp.Titlepage
1Introduction1
1.1Historical background3
1.2Polyurethane market5
References8
2Starting components9
2.1Polyisocyanates9
2.2Polyether polyols23
2.3Polyester polyols32
2.4Bio-based polyols35
2.5Hydroxyl value and equivalent mass37
2.6Diamines and polyamines38
2.7Additives40
References46
3Polyurethane chemistry47
3.1Reactivity of the isocyanate group47
3.2Isocyanate reactions with active hydrogen compounds49
3.3Isocyanate-isocyanate reactions58
3.4PU system technology63
3.5Chain topology and polymer morphology66
3.6Rheology and cure71
3.7Structure development and reaction rate73
References79
4Physical properties and flammability81
4.1General thermal behavior of polymers81
4.2Viscoelasticity84
4.3Dynamic mechanical analysis87
4.4Melting of the hard domains89
4.5Burning behavior and flame protection93
References97
5Processing98
5.1Prepolymer process and one-shot method98
5.2Discontinuous and continuous processing98
5.3Low-pressure processing100
5.4High-pressure processing101
5.5RIM technology102
5.6Equipment104
References110
6Foam formation111
6.1Simultaneous formation of polymer and foam111
6.2Aeration and nucleation113
6.3Bubble growth115
6.4Fine-cell rigid foams122
6.5Foam properties123
References124
7Rigid foams125
7.1Rigid foam formulations125
7.2Glass transition temperature129
7.3Foam formation131
7.4Properties134
7.5Applications and processing147
References157
8Flexible foams159
8.1Foam properties161
8.2Flexible foam formulations164
8.3Polymer topology and morphology166
8.4Manufacturing of open-cell foam169
8.5Morphology and polymer hardness174
8.6Compression hardness176
8.7Ball rebound resilience, hysteresis, and loss factor179
8.8MDI versus TDI technology179
8.9Processing181
8.10Technical foams185
References188
9Elastomers190
9.1Elastomer starting materials and formulations191
9.2Chain topology194
9.3Polymer morphology196
9.4Effect of processing on morphology208
9.5Performance-related tests212
9.6Mechanical properties214
9.7Applications218
References222
10Sustainability and outlook224
10.1Improved carbon footprint of PU starting materials224
10.2Emission and odor225
10.3Insulation226
10.4Recycling of PU226
10.5Epilogue227
References228
11Symbols and abbreviations229
12Unit conversion tables233
13Calculations236
13.1Basic equations236
13.2Worked examples237
13.3Average functionality of a polyol mixture238
13.4Hard block content of an elastomer238
Index 241

Preface

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

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