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Unusual Spherulitic Morphology of Poly(propylene fumarate)

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Abstract

Spherulites are the most common crystalline morphology and thus the visual expression of crystal structures for polymers. The diversified patterns have provided intuitive morphology probes for various crystallization behaviors, while the correlations between them are still needed to be enriched. In this work, the complicated spherulitic morphology of poly(propylene fumarate) (PPF), which is sensitive to crystallization temperature, is investigated. PPF melt, respectively, crystallizes into rough spherulites, regularly banded spherulites, and spherulites containing both two kinds of morphology at low, high, and mediate temperatures. By systematically assaying, it is clear that the growth axis along the radial direction changes from a-axis to b-axis as the crystallization temperature increases, which leads to the formation of unique crystallization-temperature-dependent spherulites. Based on detailed characterization of Fourier transform infrared spectroscopy, the packing state of the specific hydrogen bonds of “C=C-H⋯O=C-C=C” in PPF crystal lattices is determined, and furthermore, the mechanism for temperature-dependent selection of growth axes for PPF spherulites in melt is reasonably speculated.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 21674128) and Science Foundation of China University of Petroleum, Beijing (No. ZX20200097).

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Correspondence to Hai-Mu Ye.

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Meng, XY., Li, Y., Yao, SF. et al. Unusual Spherulitic Morphology of Poly(propylene fumarate). Chin J Polym Sci 39, 493–500 (2021). https://doi.org/10.1007/s10118-021-2518-y

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