Preparation and Characterization of H-Shaped Polylactide (2024)

Zografos, A., Maines, E., Hassler, J. F., Bates, F. S. (Accepted/In press). Preparation and Characterization of H-Shaped Polylactide. ACS Macro Letters, 695-702. https://doi.org/10.1021/acsmacrolett.4c00217

Preparation and Characterization of H-Shaped Polylactide. / Zografos, Aristotelis; Maines, Erin; Hassler, Joseph F et al.
In: ACS Macro Letters, 2024, p. 695-702.

Research output: Contribution to journal › Article › peer-review

Zografos, A, Maines, E, Hassler, JF, Bates, FS 2024, 'Preparation and Characterization of H-Shaped Polylactide', ACS Macro Letters, pp. 695-702. https://doi.org/10.1021/acsmacrolett.4c00217

Zografos A, Maines E, Hassler JF, Bates FS, Hillmyer MA. Preparation and Characterization of H-Shaped Polylactide. ACS Macro Letters. 2024;695-702. doi: 10.1021/acsmacrolett.4c00217

Zografos, Aristotelis ; Maines, Erin ; Hassler, Joseph F et al. / Preparation and Characterization of H-Shaped Polylactide. In: ACS Macro Letters. 2024 ; pp. 695-702.

@article{33d1a5589f9b480d955faf91ef953648,

title = "Preparation and Characterization of H-Shaped Polylactide",

abstract = "An H-polymer has an architecture that consists of four branches symmetrically attached to the ends of a polymer backbone, similar in shape to the letter “H”. Here, a renewable H-polymer efficiently synthesized using only ring-opening transesterification is demonstrated. The strategy relies on a tetrafunctional poly(±-lactide) macroinitiator, from which four poly(±-lactide) branches are grown simultaneously. 1H NMR spectroscopy, size exclusion chromatography (SEC), and matrix-assisted laser desorption/ionization (MALDI) spectrometry were used to verify the macroinitiator purity. Branch growth was probed using 1H NMR spectroscopy and SEC to reveal unique transesterification phenomena that can be controlled to yield architecturally pure or more complex materials. H-shaped PLA was prepared at the multigram scale with a weight-average molar mass Mw > 100 kg/mol and low dispersity {\D} < 1.15. Purification involved routine precipitations steps, which yielded products that were architecturally relatively pure (∼93%). Small-amplitude oscillatory shear and extensional rheology measurements demonstrate the unique viscoelastic behavior associated with the H-shaped architecture.",

author = "Aristotelis Zografos and Erin Maines and Hassler, {Joseph F} and Bates, {Frank S} and Hillmyer, {Marc A.}",

note = "Publisher Copyright: {\textcopyright} 2024 American Chemical Society.",

year = "2024",

doi = "10.1021/acsmacrolett.4c00217",

language = "English (US)",

pages = "695--702",

journal = "ACS Macro Letters",

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publisher = "American Chemical Society",

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AU - Zografos, Aristotelis

AU - Maines, Erin

AU - Hassler, Joseph F

AU - Bates, Frank S

AU - Hillmyer, Marc A.

N1 - Publisher Copyright:© 2024 American Chemical Society.

PY - 2024

Y1 - 2024

N2 - An H-polymer has an architecture that consists of four branches symmetrically attached to the ends of a polymer backbone, similar in shape to the letter “H”. Here, a renewable H-polymer efficiently synthesized using only ring-opening transesterification is demonstrated. The strategy relies on a tetrafunctional poly(±-lactide) macroinitiator, from which four poly(±-lactide) branches are grown simultaneously. 1H NMR spectroscopy, size exclusion chromatography (SEC), and matrix-assisted laser desorption/ionization (MALDI) spectrometry were used to verify the macroinitiator purity. Branch growth was probed using 1H NMR spectroscopy and SEC to reveal unique transesterification phenomena that can be controlled to yield architecturally pure or more complex materials. H-shaped PLA was prepared at the multigram scale with a weight-average molar mass Mw > 100 kg/mol and low dispersity Đ < 1.15. Purification involved routine precipitations steps, which yielded products that were architecturally relatively pure (∼93%). Small-amplitude oscillatory shear and extensional rheology measurements demonstrate the unique viscoelastic behavior associated with the H-shaped architecture.

AB - An H-polymer has an architecture that consists of four branches symmetrically attached to the ends of a polymer backbone, similar in shape to the letter “H”. Here, a renewable H-polymer efficiently synthesized using only ring-opening transesterification is demonstrated. The strategy relies on a tetrafunctional poly(±-lactide) macroinitiator, from which four poly(±-lactide) branches are grown simultaneously. 1H NMR spectroscopy, size exclusion chromatography (SEC), and matrix-assisted laser desorption/ionization (MALDI) spectrometry were used to verify the macroinitiator purity. Branch growth was probed using 1H NMR spectroscopy and SEC to reveal unique transesterification phenomena that can be controlled to yield architecturally pure or more complex materials. H-shaped PLA was prepared at the multigram scale with a weight-average molar mass Mw > 100 kg/mol and low dispersity Đ < 1.15. Purification involved routine precipitations steps, which yielded products that were architecturally relatively pure (∼93%). Small-amplitude oscillatory shear and extensional rheology measurements demonstrate the unique viscoelastic behavior associated with the H-shaped architecture.

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