Unique Banded Cylindrites of Polyoxymethylene/Poly(butylene succinate) Blends Induced by Interfacial Shear AITranslate

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DOI：https://doi.org/10.1021/acsapm.9b00658

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Unique banded cylindrites of polyoxymethylene/poly(butylene succinate) blends were induced by the intense interfacial shear, which was applied by pulling a single glass fiber (GF) with non-nucleation ability. The crystalline morphology and structure of banded cylindrites were quantitively correlated with the shear rates to provide revealing insights in shear-induced nucleation and lamellar assembly. Densely packed row-nuclei emerged on the surface of pulled GF and the nucleation density increased dramatically with the shear rate. The subsequent lamellar extension and twisting were restricted perpendicularly to the GF axis, resulting in the formation of banded cylindrites. As the shear rate increased, the band spacing showed a linear decrease and the eccentricity of elliptical bands showed a linear increase. It was attributed to the augment of unbalanced surface stress caused by steric hindrance of serried nuclei. While the growth rate of banded cylindrites remained constant regardless of the shear rate, suggesting that the growth of twisted lamellae was a diffusion-dominated process. Subtle observation by scanning electronic microscopy indicated that shear-induced row-nuclei always started from edge-on bands, and there was a threshold value for the size of central nuclei to activate lamellar twisting. The mechanism for the formation of interfacial shear-induced banded cylindrites was discussed, which gives a valuable reference to tailor the crystalline morphology of polymer blends for broadening their application.