Unusual Spherulitic Morphology of Poly(propylene fumarate)

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...

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Bibliographic Details
Published in:Chinese journal of polymer science 2021-04, Vol.39 (4), p.493-500
Main Authors: Meng, Xiao-Yu, Li, Yi, Yao, Shu-Fang, Wei, Xue-Wei, Ye, Hai-Mu
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Crystal lattices
Crystal structure
Crystallization
Fourier transforms
Hydrogen bonds
Industrial Chemistry/Chemical Engineering
Morphology
Polymer Sciences
Polypropylene fumarate
Spherulites
Temperature
Temperature dependence
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Summary: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.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-021-2518-y