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- W4318219054 abstract "Bottlebrush molecules are branched polymers with a long linear backbone densely grafted by many relatively short linear side chains. Such a unique molecular architecture enables bottlebrush polymers with properties and functions inaccessible by their linear counterparts. The existing understanding is that, in melts of bottlebrush polymers, the interbackbone distance decreases as the grafting density of side chains becomes smaller. Here, we experimentally discover a behavior opposite to all existing works: the interbackbone distance increases monotonically as the grafting density decreases. To explain these remarkable experimental findings, we develop a theory by accounting for the incompatibility between the backbone and side chains within a bottlebrush molecule. The backbone polymer folds into a cylindrical core with all grafting sites on its surface to reduce interfacial free energy. As the grafting density decreases, the backbone collapses; this process not only increases the diameter of the cylindrical core but also reduces the distance between grafting sites in space, such that the extension of side chains is not alleviated. Our discovery presents a paradigm-shifting understanding of the molecular structure of bottlebrush polymers." @default.
- W4318219054 created "2023-01-27" @default.
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- W4318219054 date "2023-01-27" @default.
- W4318219054 modified "2023-10-01" @default.
- W4318219054 title "Unexpected Folding of Bottlebrush Polymers in Melts" @default.
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- W4318219054 doi "https://doi.org/10.1021/acs.macromol.2c02053" @default.
- W4318219054 hasPublicationYear "2023" @default.
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