Abstract
Structure changes of syndiotactic polypropylene (sPP) under uniaxial stretching are studied with the combination of micro-tensile tester and in situ wide angle X-ray diffraction (WAXD) measurement. Lamellae stacked “vertically” and “parallel” to the stretching direction (defined as “V” and “P” part) are separated on the basis of two-dimensional WAXD patterns. For all samples with different lamellar thickness, two critical points named as b 1 and b 2 were found in the stress–strain curves, while b 1 and b 2 points are the onsets of the rotation for the lamellae of “V” part and “P” part, respectively. The corresponding true stress and true strain for b 2 point are bigger than that of b 1 , demonstrating that for samples with initial isotropic lamellar orientation, inhomogeneous deformation of crystalline skeleton induced by uniaxial stretching is universal. And after b 1 point, “stress-induced melting” always occurs simultaneously with lamellar slips. Furthermore, the relationship between lamellar thickness and the true stress for b 1 and b 2 point was also studied, illustrating a linear correlation between ln σ and 1/l (σ is the corresponding true stress, l is the lamellar thickness), consistent with Young’s model. However, the critical true strains for these two points did not change with the varying thickness.
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Acknowledgements
The authors like to express their sincere thanks to the National Natural Science Foundation of China for financial support (Grant No.51103138) and thanks also go to Prof. Liangbin Li at the National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China for his help during synchrotron 2D-WAXD experiment.
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Shao, C., Ma, Z., Zhuo, R. et al. Inhomogeneous deformation of crystalline skeleton of syndiotactic polypropylene under uniaxial stretching. J Mater Sci 47, 3334–3343 (2012). https://doi.org/10.1007/s10853-011-6173-5
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DOI: https://doi.org/10.1007/s10853-011-6173-5