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Orientation behavior of AB and ABC block copolymers under large amplitude oscillatory shear flow

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Abstract

Flow alignment in a large amplitude oscillatory shear field (LAOS) of a lamellar AB and a lamellar ABC block copolymer (A,B are lamellae, C forms cylinders in B-lamellae) has been studied. 2D-small angle X-ray scattering (2D-SAXS) and scanning electron microscopy were used for morphological characterization, and flow birefringence and Fourier-Transform rheology were used to monitor the orientation. The diblock copolymer shows the known frequency-dependent orientation behavior, i.e., a perpendicular or a parallel orientation of the lamellae, while under all conditions for the ABC block copolymer only a perpendicular orientation after a long induction period was found. Due to the introduced third block C the AB lamellar structure with a high viscosity contrast between the A and B domains cannot adapt a parallel orientation of sliding phases. Dynamic mechanical analysis indicates shear induced improvement of the microphase separation of the short C block.

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Acknowledgement

We acknowledge stimulating discussions with H. R. Brand, G. Auernhammer and M. Gradzielski. We also thank C. Abetz and A. Göpfert for performing the SEM and TEM investigations. Financial support by the Deutsche Forschungsgemeinschaft (SFB481), the German Israeli Foundation for Scientific Research and Development (G.I.F. I-0542–144.05/97) and INTAS (99–01852) is gratefully acknowledged.

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  1. Makromolekulare Chemie II, Universität Bayreuth, D-95440, Bayreuth, Germany

    Stefan Stangler & Volker Abetz

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  1. Stefan Stangler
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  2. Volker Abetz
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Correspondence to Volker Abetz.

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Stangler, S., Abetz, V. Orientation behavior of AB and ABC block copolymers under large amplitude oscillatory shear flow. Rheol Acta 42, 569–577 (2003). https://doi.org/10.1007/s00397-003-0313-z

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