Reversible photoreaction of C60-containing poly(vinyl alcohol)

✍ Scribed by Yun Chen; Chang-Hsin Tsai

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 183 KB
• Volume: 70
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19981017)70:3<605::aid-app23>3.0.co;2-y

✦ Synopsis

Poly(vinyl alcohol) (PVA) was reacted with strong base NaH to convert its pendant hydroxy to oxy anions, followed with nucleophilic addition to buckminsterfullerene-C 60 . The resulted PVA(C 60 Ϫ Na ϩ ) n products were then converted to PVA(C 60 H) n by stirring with a strong acid cation exchanger of the H ϩ form. The reduced viscosities of PVA(C 60 H) n decreases with amount of C 60 , and are between 0.38 and 0.66 dL/g compared to 1.97 dL/g of the original PVA. Repeated photocrosslinking under 300 nm light and photocleavage under 254 nm light of these C 60 -containing PVAs were investigated in DMSO by tracing their UV absorption variations at 325 nm (maximum absorption of C 60 H). It is confirmed that both PVA(C 60 H) n exhibit excellent reversibility at least under the observed three cycles.