0100491840

open access

Accepted Manuscript

Selective acetylation of amorphous region of poly(vinyl alcohol) in supercritical carbon dioxide

English (英語)

Polymer Journal

55(12)

1287-1293

Nature Publishing Group

2023-08-23

2024-10-23

The postfunctionalization of poly(vinyl alcohol) (PVA) with a hierarchical structure has been challenging because conventional polymer functionalization reactions are performed in homogeneous solution states. In this study, the selective functionalization of PVA was achieved in supercritical carbon dioxide (sc-CO₂) through acetylation in the amorphous region only and not in the crystalline region. The crystalline region of PVA was retained in the amorphous-selective acetylated PVA synthesized in sc-CO₂. In addition, the oriented structure of the PVA crystallites was maintained even after acetylation of the drawn PVA film in sc-CO2. Moisture adsorption affected the crystalline structure of PVA acetylated in sc-CO₂. The acetylated PVA synthesized in sc-CO₂ included a larger number of water molecules under humid conditions, and the increase in thickness was smaller than that of randomly acetylated PVA. This reason was the rigid crystalline structure and the sequential hydrophilic PVA units in the PVA acetylated in sc-CO₂.

Polymers

学術雑誌論文

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1038/s41428-023-00832-2