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Structural relaxation of poly(methyl methacrylate) has been studied by differential scanning calorimetric (d.s.c.) and dynamic mechanical techniques, and the effect of temperature of ageing has been investigated. Isothermal ageings at temperatures between T g - 30 K and T g - 100 K lead to d.s.c. pre-peaks and a diminution of the mechanical loss tangent. The β relaxation is not affected...
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