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Relationship between Localization of PBSU in Interlamellar/Interfibrillar Regimes and Double Peaks in DSC/SAXS in its Blend with PVDF

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Abstract

In this work, phase segregation and localization of PBSU have been investigated with the combination of SAXS and DSC in its blend with PVDF. After stepwise crystallization of PVDF and PBSU, there are double melting peaks of PBSU in DSC and double scattering peaks in SAXS. It has been demonstrated that double peaks can be attributed to the localization of PBSU in interlamellar/interfibrillar region in pre-formed PVDF crystal framework. In the case of low content of PBSU in blend, PBSU is trapped into the interlamellar region of PVDF crystals, resulting in the alternating lamellae crystal of them and the first peak (with low-q) in SAXS. The enhanced confinement effect produces thinner PBSU lamellae, corresponding to the lower melting temperature in DSC. Upon increasing its content in blend, some PBSU segregates in interfibrillar regions in addition to the enrichment in interlamellar regions of PVDF crystal framework. The larger space and higher concentration of PBSU in interfibrillar-regions contribute to periodic lamellae structure of PBSU with higher thickness, which is the reason for the second peak (with high-q) in SAXS and DSC. Our results not only clarify the relationship between localization of PBSU in interlamellar/interfibrillar regions and double peaks in DSC/SAXS, but also provide a novel strategy to detect the interlamellar and interfibrillar segregation of low-Tm component in miscible crystalline/crystalline blend.

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Acknowledgments

This work was financially supported by National Key Research and Development Program of China (No. 2018YFB0704200) and the National Natural Science Foundation of China (Nos. 51973048 and U1732123).

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Authors and Affiliations

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Jia-Yao Wang & Feng-Gang Bian

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jia-Yao Wang & Feng-Gang Bian

  3. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China

    Feng-Gang Bian

  4. College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, China

    Jia-Yao Wang, Yong-Jin Li & Ji-Chun You

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  1. Jia-Yao Wang
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Relationship between Localization of PBSU in Interlamellar/Interfibrillar Regimes and Double Peaks in DSC/SAXS in its Blend with PVDF

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Wang, JY., Li, YJ., You, JC. et al. Relationship between Localization of PBSU in Interlamellar/Interfibrillar Regimes and Double Peaks in DSC/SAXS in its Blend with PVDF. Chin J Polym Sci 40, 631–641 (2022). https://doi.org/10.1007/s10118-022-2718-0

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