Projekteja vuodessa
Abstrakti
When cellulose nanocrystals (CNCs) are isolated from cellulose microfibrils, the parallel arrangement of the cellulose chains in the crystalline domains is retained so that all reducing end-groups (REGs) point to one crystallite end. This permits the selective chemical modification of one end of the CNCs. In this study, two reaction pathways are compared to selectively attach atom-transfer radical polymerization (ATRP) initiators to the REGs of CNCs, using reductive amination. This modification further enabled the site-specific grafting of the anionic polyelectrolyte poly(sodium 4-styrenesulfonate) (PSS) from the CNCs. Different analytical methods, including colorimetry and solution-state NMR analysis, were combined to confirm the REG-modification with ATRP-initiators and PSS. The achieved grafting yield was low due to either a limited conversion of the CNC REGs or side reactions on the polymerization initiator during the reductive amination. The end-tethered CNCs were easy to redisperse in water after freeze-drying, and the shear birefringence of colloidal suspensions is maintained after this process.
Alkuperäiskieli | Englanti |
---|---|
Sivut | 2702–2717 |
Sivumäärä | 16 |
Julkaisu | Biomacromolecules |
Vuosikerta | 22 |
Numero | 6 |
Varhainen verkossa julkaisun päivämäärä | 1 kesäk. 2021 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 14 kesäk. 2021 |
OKM-julkaisutyyppi | A1 Julkaistu artikkeli, soviteltu |
Sormenjälki
Sukella tutkimusaiheisiin 'Challenges in Synthesis and Analysis of Asymmetrically Grafted Cellulose Nanocrystals via Atom Transfer Radical Polymerization'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 3 Päättynyt
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SYMBIOCELL: Symbioosi monikomponenttisten reaktioiden ja Pickering-emulsioiden välillä edistyneeseen nanoselluloosan muokkaukseen - SYMBIOCELL
Heise, K.
01/09/2020 → 31/01/2023
Projekti: Academy of Finland: Other research funding
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CERES: Competence Center for the materials Bioeconomy: A Flagship for our Sustainable Future
01/05/2018 → 31/12/2022
Projekti: Academy of Finland: Other research funding
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Nano: (Nano)selluloosan vedetön, edullinen click-muokkaus ja hapettava regenerointi
Sixta, H., Guizani, C., Johansson, L., Moriam, M. K., Schlapp-Hackl, I., Witos, J. & Fang, W.
01/09/2017 → 31/08/2021
Projekti: Academy of Finland: Other research funding