By William Woishnis, Sina Ebnesajjad (Eds.)
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Additional resources for Chemical Resistance of Thermoplastics
Pipe of the same diameter but of different wall thicknesses will develop different strains with the same deflection. Also, pipes having the same wall thickness but different constructions making up the wall may develop different strains with the same deflection. Scope 1. This test method covers the procedure for determining the chemical-resistant properties of fiberglass pipe in a deflected condition for diameters 4 in. (102 mm) and larger. Both glass-fiber-reinforced thermosetting resin pipe (RTRP) and glassfiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipes.
For amorphous polymers above the Tg, that is, in the flexible and rubbery states, there is more space (free volume) available through which diffusing molecules may pass, and so these materials show comparatively high diffusion rates with low molecular-weight diffusing fluids. For crystalline polymers between Tg and Tm, the diffusion rate is very dependent on the degree of crystallization. Several factors affect the permeation rate of the polymer. Temperature increase raises the permeation rate for two reasons.
However, as the melting point is approached, the TΔS term in the equation below increases. ΔG5ΔH2TΔS ð2:5Þ Here, T is the absolute temperature, ΔS the entropy change, and ΔH the enthalpy change. So, with increasing temperature, ΔG can become negative and dissolution can therefore occur. Hence, at room temperature, there are no solvents for polyethylene, polypropylene, poly-4-methylpentene-1, polyacetal or polytetrafluoroethylene, but at temperatures of about 30°C below their melting points, solvents of similar solubility parameter are effective.
Chemical Resistance of Thermoplastics by William Woishnis, Sina Ebnesajjad (Eds.)