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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster Session I

CPP 15.55: Poster

Montag, 17. März 2025, 19:00–21:00, P4

The effect of intracrystalline chain dynamics (ICD) in the stress relaxation of semi-crystalline polymers — •Tonghua Liu, Rose Mary Michell, Albrecht Petzold, and Thomas Thurn-Albrecht — Von-Danckelmann-Platz 3, 06120, Halle(Saale)

The intracrystalline chain dynamics (ICD) plays a significant role in semi-crystalline polymers (SC), influencing not only the polymer crystallization and morphology but also the stability of crystals and the mechanical properties, such as drawability. Here we investigate how the ICD affects the stress relaxation of SC polymers.
Plane-strain compression test is used to study the relaxation behavior after yielding point. For crystal-fixed polymers like polycaprolactone (PCL), where ICD is absent or significantly hindered, only one relaxation process is observed. In contrast, crystal-mobile polymers like high density polyethylene (HDPE) exhibit two distinct relaxation processes, which can be attributed to the additional mobility within the crystals. The two relaxation processes in HDPE demonstrate markedly distinct time scales. The faster relaxation process is observed to relax faster with increasing temperature, whereas the slower relaxation process remains unaltered within the chosen temperature range.

Keywords: stress relaxation; incracrystalline chain dynamics; semi-crystalline polymer; alpha-c relaxation