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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 88: Responsive and Adaptive Systems

CPP 88.1: Vortrag

Donnerstag, 19. März 2020, 09:30–09:45, ZEU 114

Orientation approach to directional deformations in glassy azopolymers — •Bharti yadav, Jan Domurath, and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden e.V., PF 120411, 01069 Dresden

Glassy azopolymers deform in the presence of light even below the glass transition temperature , as the light induced stress is greater than the yield stress . The photodeformations are directional and depend on the polarization of light . For linearly polarized light the azopolymers elongate in the direction of polarization and for circularly polarized light in the plane perpendicular to the propagation vector. The cause of these directional deformations is the orientation potential which acts on each chromophore attached to the main chain and generates a light induced stress. We model the azopolymers as visco-plastic materials by implementing the stress in a finite element modelling software ANSYS. The true strains and elongations are calculated as a function of time for both linearly and circularly polarized light when the intensity of light is homogeneous [1]. Additionally, we implement the light induced stress corresponding to stripe-like Gaussian distributed light with polarization in the direction of intensity gradient to get the photodeformations and to compare with experimental results [2]. [1] B. Yadav, J. Domurath, K. Kim, S. Lee, M. Saphiannikova, J. Phys. Chem. B 122 (2019) 2001-2009 [2] A. Ambrosio , A. Camposeo, A. Carella,F. Borbone, D. Pisignano, A. Roviello, P. Maddalena, J. App. Phys. 107 (2010) 083110