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Shear effects on crystallization behaviors and structure transitions of isotactic poly-1-butene

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Abstract

Different melt pre-shear conditions were applied to isotactic poly-1-butene (iP-1-B) and the effect on the crystallization behaviors and the crystalline structure transitions of iP-1-B were investigated. The polarized optical microscope observations during isothermal crystallization process revealed that the applied melt pre-shear within the experimental range could enhance the nucleation of crystal II and accelerate the diameter growth of the formed spherulites. If the applied melt pre-shear rate was large enough, Shish-Kebabs structure could be formed. After the isothermal crystallization process, the following crystal transition from form II to form I of iP-1-B at room temperature was characterized by X-ray diffraction. It was found that the applied melt pre-shear within the experimental range seemed to have no influence on the crystal transition, implying no strong enough internal stress was formed in the melt pre-sheared iP-1-B samples. Further investigations were applied with synchrotron radiation instruments. Wide angle X-ray scattering (WAXS) and small angle X-ray scattering (SAXS) after the crystal transition showed that the applied melt pre-shear could result in orientated fine crystalline structures. With the melt pre-shear rate increasing, the lattice spaces of the crystallites decreased and the long period, L, and the amorphous layer thickness, La, along the equator direction increased slightly, but L and La along the meridian direction was not affected by melt pre-shear flow. Though the orientated crystalline structures existed in the iP-1-B samples, no accelerating effect on crystal transition from II to I was found. Importantly, the final crystalline structures of iP-1-B in form I was found tunable under different melt pre-shear conditions, even though there was an additional crystal transition process after the isothermal crystallization process of iP-1-B.

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Acknowledgements

The authors gratefully acknowledge the supports of National Natural Science Foundation of China (51173130, 21374077, 21204062, 51173089 and 50903061).

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Correspondence to Shichun Jiang.

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Li, J., Guan, P., Zhang, Y. et al. Shear effects on crystallization behaviors and structure transitions of isotactic poly-1-butene. J Polym Res 21, 555 (2014). https://doi.org/10.1007/s10965-014-0555-8

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