Abstract
Torsional and tensile creep properties of a cellulose acetate butyrate ester and the polyimide Kapton-H were studied in order to reveal physical ageing in these rigid chain polymers. The measured shift rates, μ, were 0.75 and 0.5 for cellulose and polyimide respectively, which indicates that physical ageing also occurs in polymers with stiff chains. These values, compared with those already known for most thermoplastics ( μ ∼ 1), suggest that physical ageing is slowed down by the rigidity of the main chain.
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