抄録
Coumarin containing poly(ethylene glycol) monols and diols were prepared in a telechelic fashion using quantitative end group esterification. The coumarin modified poly(ethylene glycol) monols and diols were solution cast into films (1 to 15 μm) and chain extended via the dimerization of the coumarin derivatives with UVA (>300 nm) light irradiation. The coumarin-modified PEG diol doubled in molecular weight, and the molecular weight distribution increased from 1.17 to 2.75 upon exposure to 110 J·cm-2 of UVA light. The chain extended poly(ethylene glycol)s were subsequently converted to their original molecular weight via the photocleavage reaction of the coumarin dimer at 254 nm with less than 2 J·cm-2. The photoreversible chain length modulation was monitored utilizing GPC, DSC and UV-Vis spectroscopy.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 715-723 |
| ページ数 | 9 |
| ジャーナル | Macromolecular Chemistry and Physics |
| 巻 | 205 |
| 号 | 6 |
| DOI | |
| 出版ステータス | Published - 2004 4月 23 |
| 外部発表 | はい |
ASJC Scopus subject areas
- 凝縮系物理学
- 物理化学および理論化学
- ポリマーおよびプラスチック
- 有機化学
- 材料化学