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Relaxation dynamics of stretched polymer chains traced by shear induced Shish-Kebab structure

Authors


Correspondence to: Q. Liao (E-mail: qiliao@iccas.ac.cn) or J. Zhou (E-mail: pla_zjj@bnu.edu.cn)

ABSTRACT

We have developed a morphologic method to investigate the relaxation processing of the stretched polymer chains in melts, in which an atomic force microscope probe was used to shear the surface of an isotactic polypropylene melt to obtain the isolated shish-kebab structure. We present the results of the time dependence of length of the isolated shish-kebab structure and the stress dependence of the kebab density along the direction of shish in this paper. Our results demonstrate that the shear-oriented polymer melts show the relaxation dynamics of worm-like chain where the length deficit of the isolated shish-kebab structure is scaled with the relaxation time as a power of 1/3. The melting behavior of shish-kebab structure was also investigated. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 907–914

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