Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2025

Weak non-linearities of amorphous polymer under creep in the vicinity of the glass transition

Résumé

The creep behavior of an amorphous poly(etherimide) (PEI) polymer is investigated in the vicinity of its glass transition in a weakly non linear regime where the acceleration of the creep response is driven by local configurational rearrangements. From the time shifts of the creep compliance curves under stresses from 1 to 15 MPa and in the temperature range between T g -10K and T g , where T g is the glass transition, we determine a macroscopic acceleration factor. The macroscopic acceleration is shown to vary as e -(Σ/Y ) n with n = 2 ± 0.2, where Σ is the macroscopic stress and Y is a decreasing function of compliance. Because at the beginning of creep, the stress is homogeneous, the macroscopic acceleration is thus similar to the local one, in agreement with the recent theory of Long et al. (Phys. Rev. Mat. (2018) 2, 105601 ) which predicts n = 2. For larger compliances, the decrease of the of Y is interpreted as a signature of the development of stress disorder during creep.

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Dates et versions

hal-04886808 , version 1 (14-01-2025)

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Martin Roman-Faure, Hélène Montes, François Lequeux, Antoine Chateauminois. Weak non-linearities of amorphous polymer under creep in the vicinity of the glass transition. European Physical Journal E: Soft matter and biological physics, 2025, 48 (1), pp.4. ⟨10.1140/epje/s10189-024-00468-x⟩. ⟨hal-04886808⟩
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