AI Article Synopsis
- Single crystals that lack translational symmetry have been observed in different materials, particularly in polymers where unique structures like twisted crystals and non-flat single crystals appear.
- Researchers have discovered scrolled single crystals of poly(L-lactic acid) (PLLA), a biodegradable polymer, which differ from the typical flat crystals formed in solution.
- The scrolled structure of PLLA crystals is influenced by factors such as the polymer's molecular weight and the presence of polymer chain ends, suggesting a novel mechanism for disrupting translational symmetry in the growth of polymer single crystals.
Article Abstract
Single crystals that do not obey translational symmetry have been reported in various material systems. In polymers, twisted crystals are typically formed in banded spherulites, while a class of non-flat polymer single crystals (PSCs) has been observed. Herein, we report the formation of scrolled single crystals of biodegradable polymer poly(L-lactic acid) (PLLA). While classical 2-dimensional single crystals formed in solution-crystallized PLLA are flat, we show that PLLA crystals bend into scrolls when the polymer molecular weight is low. The formation of these unique scrolled PLLA single crystals depends on polymer chain ends and the polymer molecular weight. This work, therefore, demonstrates a new mechanism to break translational symmetry in PSC growth.
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| http://dx.doi.org/10.1002/anie.202420137 | DOI Listing |
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