Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Activated and Glassy Dynamics of Soft Matter (joint session CPP/DY, organized by CPP)
CPP 35.5: Talk
Wednesday, March 9, 2016, 10:30–10:45, H51
Lifetime Prediction of Physical Ageing in Glassy Polymer Membranes — •Nils Müller1, Ulrich Alexander Handge1, and Volker Abetz1,2 — 1Helmholtz-Zentrum Geesthacht, Institute of Polymer Research, Geesthacht, Germany — 2University of Hamburg, Institute of Physical Chemistry, Hamburg, Germany
The long-term performance stability of glassy polymer membranes is strongly affected by physical ageing. Therefore, we investigate the lifetime evolution of membrane properties through the application of the ageing model developed by Struik [1] and the statistical analysis thereof [2]. We propose several lifetime definitions suitable for membrane characterisation. The bootstrapping method is used in our analysis of the influence of a reduction of the data points used in model fitting on prediction quality. In this context we discuss the interdependency of experimental time expenditure and choice of model parameters with regard to lifetime prediction. A dimensional analysis of the Struik equation yields a master curve concerning the accelerated ageing behaviour of thin films. Our analysis of the master curve reveals a weak dependence of the membrane lifetime on initial conditioning. Dependent on the lifetime definition, we find a varying relationship between lifetime and relaxation time ranging from proportional to inverse proportional.
[1] L.C.E. Struik (1978). Physical aging in amorphous polymers and other materials.
[2] N. Müller, U.A. Handge, and V. Abetz (2015). Physical ageing and lifetime prediction of polymer membranes for gas separation processes. Submitted for publication.