Low density cellular plastics
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Low density cellular plastics: Physical basis of behaviour

Low density cellular plastics: Physical basis of behaviour


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About the Book

Foams are gas filled integral structures in which the gas is finely dispersed throughout acontinuouslyconnected solid phase. The bulk density is usually substantially lower than that of the solid component, and for the foams which form the focus for this book the volume fraction of the gas phase is considerably greater than 0.5 and in most instances in excess of 0.9. Many ofthe materials encountered in every day experience, such as bread, plants and trees, structural materials for buildings, comfort materials for domestic and automotive seating, shock absorbers or car bumpers and materials for noise control, have one thing in common - the cellular nature of their physical structure. Whyare thesestructuressoimportantin the naturaland man-made world? The reasons are both technical and commercial. From a technical viewpoint cellular materials offer: 1. high specific stiffness and strength - making them suitable for structural applications; 2. closeto idealenergymanagement - hencetheir useinthermalandacoustic insulation, vibration damping, acoustic absorption and shock mitigation; and 3. comfort - hence their use for domestic and automotive seating.

Table of Contents:
1 Physical behaviour of polymeric foams — an overview.- 1.1 General.- 1.2 Foam formation.- 1.3 Cell structure.- 1.4 Matrix polymer morphology.- 1.5 Thermal behaviour.- 1.6 Stress—strain behaviour.- 1.7 Energy management.- 1.8 Final comments.- References.- 2 Polyurethane flexible foam formation.- 2.1 Introduction.- 2.2 Reaction chemistry.- 2.3 Morphology development.- 2.4 The cell opening mechanism.- 2.5 Conclusions.- Acknowledgements.- References.- 3 Characterizations of polymeric cellular structures.- 3.1 Introduction.- 3.2 Background.- 3.3 Quantitative characterization.- 3.4 Stereology.- 3.5 Difficulties associated with measurement.- 3.6 Optical microscopy.- 3.7 Final comments.- Acknowledgements.- References.- 4 The morphology of flexible polyurethane matrix polymers.- 4.1 Introduction.- 4.2 The dynamics of phase separation.- 4.3 The morphological characterization of foams.- 4.4 Summary.- Acknowledgements.- References.- 5 Heat transfer in foams.- 5.1 Introduction.- 5.2 Conduction heat transfer.- 5.3 Radiative heat transfer.- 5.4 Gas conduction.- 5.5 Overall conductivity.- Acknowledgements.- Appendix A: Lower limit analysis.- Appendix B: List of symbols.- References.- 6 Thermal ageing.- 6.1 Introduction.- 6.2 Theory and modelling.- 6.3 Experimental methods.- 6.4 Different testing methods.- Appendix: List of symbols.- References.- 7 The elastic behavior of low-density cellular plastics.- 7.1 Introduction.- 7.2 Elastic behavior of perfectly ordered two-dimensional foams.- 7.3 Elastic behavior of three-dimensional foams.- 7.4 Future directions.- Acknowledgements.- References.- 8 Hysteresis and energy loss in flexible polyurethane foams.- 8.1 Introduction.- 8.2 Mechanical response.- 8.3 Definitions and relationships.- 8.4 Mechanisms.- 8.5 Static hysteresis.- 8.6Dynamics hysteresis.- 8.7 Ball rebound resilience.- 8.8 Conclusions.- Appendix: List of symbols.- References.- 9 Impact response.- 9.1 Introduction.- 9.2 Macroscopic deformation geometry.- 9.3 Cell geometry and deformation mechanisms.- 9.4 Impact properties.- 9.5 Relation of impact properties to microstructure.- 9.6 Packaging design.- 9.7 Complex impacts.- 9.8 Discussion.- References.- 10 Acoustic characteristics of low density foams.- 10.1 Introduction.- 10.2 Single-wave approximation for foams with a low flow resistivity.- 10.3 Acoustic properties of foams of medium and high flow resistivity.- 10.4 Matrix representation of layered porous materials.- 10.5 Conclusion.- Appendix A: Matrix elements.- References.

Review :
The book will be of major interest to polymer or materials scientists concerned with properties and applications of low density cellular polymers. Polymer International


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Product Details
  • ISBN-13: 9780412584107
  • Publisher: Chapman and Hall
  • Publisher Imprint: Chapman and Hall
  • Height: 235 mm
  • No of Pages: 369
  • Sub Title: Physical basis of behaviour
  • ISBN-10: 0412584107
  • Publisher Date: 30 Jun 1994
  • Binding: Hardback
  • Language: English
  • Returnable: Y
  • Width: 155 mm


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