Abstract
As pointed out in the introductory chapter, one of the methods of increasing the softening point and glass transition temperatures of a polymer is by chemical cross-linking of the chains. The properties of such a system depend upon the structure of the main chains, the structure of the cross-links, and the number of the cross-links Hence, many variants are possible. As the cross-link density increases, so normally does the heat resistance, but this is accompanied by decreases in impact strength, elongation at break, and reversible extensibility, and almost inevitably a compromise must be accepted. The cross-linking may be brought about either by addition or condensation reactions. The former have the advantage that no volatile by-products are evolved during cure, thus allowing simpler processing at lower pressures. Lower void contents are likely in the final material, and thick sections are much easier to fabricate. In theory all the functional groups should be used up in the cross-linking process, but in practice this is not so. Further reaction may therefore be possible if the material is later exposed to higher temperatures than those used in the cure cycle, with concomitant changes in properties.
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Critchley, J.P., Knight, G.J., Wright, W.W. (1983). Thermosetting Polymers. In: Heat-Resistant Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0396-9_2
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DOI: https://doi.org/10.1007/978-1-4899-0396-9_2
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