Conformation-Determined Segmental Dynamics in α‑Poly‑l‑Lysine Hydrobromide: The Impact of Thermally Induced β‑Sheet Formation on the Glass Transition Temperature
Rafał Bielas, Anjana Krishna Sudhakaran Nair Valsala Kumari, Krzysztof Witkowicz, Anna Mielańczyk, Magdalena Tarnacka, Anna Janowska, Karolina Jurkiewicz, Kamil Kamiński, Barbara Hachuła, Ewa Kamińska · 2026
Read Conformation-Determined Segmental Dynamics in α‑Poly‑l‑Lysine Hydrobromide: The Impact of Thermally Induced β‑Sheet Formation on the Glass Transition Temperature by Rafał Bielas, Anjana Krishna Sudhakaran Nair Valsala Kumari, Krzysztof Witkowicz, Anna Mielańczyk, Magdalena Tarnacka, Anna Janowska, Karolina Jurkiewicz, Kamil Kamiński, Barbara Hachuła, Ewa Kamińska (2026) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/PMC13501882.txt.
Description
Bielas and colleagues heated a polypeptide, poly-l-lysine hydrobromide, and watched its chain folding shift with effects for stiffness and conduction, in a 2026 study. The polymer starts as a mixture of helical, sheet-like, and turn structures. Using methods, infrared spectroscopy, X-ray scattering, calorimetry, and dielectric testing, the team tracked what heat does to structure.
Bielas found drying followed by heating driving a shift toward sheet-rich structures. The shift needed motion of hydrogen-bonded chains and an activation energy around sixty-four kilojoules per mole. Oddly, the more ordered sheet state softened the polymer, dropping its glass transition temperature rather than raising it. Electric conductivity fell even though the sheet state's hydrogen bonds are stronger. The authors infer that charge moves better through the helical state's looser electric setting, making this polymer a model for how folding governs a polymer's mobility and transport.
Catalog record
| CREATOR | Rafał Bielas, Anjana Krishna Sudhakaran Nair Valsala Kumari, Krzysztof Witkowicz, Anna Mielańczyk, Magdalena Tarnacka, Anna Janowska, Karolina Jurkiewicz, Kamil Kamiński, Barbara Hachuła, Ewa Kamińska |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 65 KB |
| LICENSE | https://creativecommons.org/licenses/by/4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |