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Depolymerization of Poly(2,6-dimethyl-1,4-phenylene oxide) in Green Solvents: Water and Ionic Liquid
Sepa
Nanayakkara A,
Antonio F.
Patti A and
Kei
Saito A B
A
School of Chemistry and Centre for Green Chemistry, Monash University, Clayton, Vic. 3800, Australia.
B
Corresponding author. Email: Kei.Saito@monash.edu
Australian Journal of Chemistry
66(1)
60-66 http://dx.doi.org/10.1071/CH12191
Submitted: 11 April 2012 Accepted: 24 August 2012 Published:
4
October
2012
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Abstract
The depolymerization of poly(2,6-dimethyl-1,4-phenyleneoxide) (PPO) was accomplished by employing 4-tert-butyl-2,6-dimethylphenol (TBDMP) and 2,6-dimethylphenol (DMP) under oxidative conditions in green solvents: water and ionic liquid. PPO depolymerized to oligomeric products in a faster process within 5 min with TBDMP and within 1 min with DMP in water. In addition to water, an ionic liquid mixture containing the 1-ethyl-3-methylimidazolium cation [C2mim] and a mixture of alkylbenzenesulfonate with xylene sulfonate anion [ABS] was used for the depolymerization of PPO. Depolymerization was successfully achieved in [C2mim][ABS] with TBDMP in a slower process within 3 h. 
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