Initiation, Development and Stabilization of Cavities during Tensile Deformation of Semicrystalline Polymers
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By using polybutene-1 as a typical example, we illustrate the initiation, development and stabilization of cavities in the sample during tensile deformation. Samples with the same crystallinity, long spacing and crystalline lamellar thickness but very different sizes of spherulites were prepared via changing the melt history. Dimension of cavities during stretching the samples was determined by in situ ultra small angle X-ray scattering techniques. It turned out that the size of the cavities was bigger in the sample with larger spherulites than the one with smaller spherulites. The results show clear evidence of initiating cavities within crystalline phase at the grain-boundary of crystalline blocks, growing of cavities passing through parallel stacked lamellar crystals and amorphous layers and finally stablized by tilted lamellae at both ends of the plate-like cavities within the spherulites.
KeywordsCavitation Deformation Polymer Polubutene-1 Spherulite
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51525305 and 21134006), and the Newton Advanced Fellowship of Royal Society (No. NA150222). We thank Dr. Bijin Xiong for his assistance during USAXS experiments.
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