Polymer networks: principles of their formation, structure, and properties
Polymer network materials are widespread in their occurrence and find many applications in the exploitation of polymer systems. The characteristic separating a network material from a conventional polymer is a molecular structure which permeates the whole sample. This structure may be the result of covalent linking of molecules, or a physical association of simple molecules, but whichever is present the properties are strongly influenced by the formation of a network. As the network formed is itself influenced strongly by the method and conditions of preparation it follows that in comparison with simple linear polymers, the properties of the final network polymer are much more influenced by preparative variables.
Written by an international team of authors, with a strong emphasis on the underlying chemistry, this book forms a timely, concise and accessible evaluation of the fundamentals of network formation, structure and properties, and how these three aspects are interrelated.
Chemists, technologists, materials scientists and engineers working in all areas of the polymer industry along with academic researchers in polymer science and technology will find this book an essential source of information in the course of their work.
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Nonlinear polymerization gelation and network formation
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behaviour block copolymers Chapter Chem chemical components composition concentration constant conversion copolymerization crosslinking CTT diagram cure curve cyclization decrease deformation degree of polymerization density dependence distribution Dusek EANCs effects Eichinger elastomeric elastomers endlinking entanglements equation equilibrium Erman experimental Flory formed Frisch gel point gelation hard segments hard-segment content Ilavsky increase initial injection moulding intramolecular reaction junction points kinetics linear Macosko Macromol Macromolecules mechanical microphase separation modulus molar mass molecular weight molecules monomer morphologies mould network chains network formation network materials network structure network-forming occur parameter phase separation Phys polymer networks Polymer Sci polyurethane predicted primary chains properties ratio reactants reacted reactive groups relaxation RIM copolymer RIM materials ring structures rubber sample shear modulus shown in Figure soft segments soft-segment spinodal spinodal decomposition Stepto stress-strain temperature tensile thermodynamic thermosetting tion trifunctional triol units values versus viscoelastic viscosity vitrification vitrification region volume fraction