Abstract

The chemical performance of plastics has a number of different aspects, including solubility, diffusion of gases and liquids, the effect of high-energy radiation, aging and weathering, and fire performance. In this chapter, chemical bonding in polymers is first considered briefly. Polymer/solvent compatibility is important when considering, for example, chemical resistance, adhesive formulation, solvent welding, migration of additives, and plasticization. Valuable information can be obtained from solubility parameters, which are discussed in detail in this chapter. Values of solubility parameters are provided for polymers, plasticizers, and other liquids, together with methods of measurement and calculation. The thermodynamics of solubility is also discussed. Diffusion of gases and liquids through different plastics is compared. Consideration is also given to the effects of thermal, photochemical, and high-energy radiation on different polymers. Natural and artificial weathering tests, and those used to assess fire retardancy are discussed.

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