Controlled depolymerization of poly(5-ethyl-5-phenyl-1,3-dioxan-2-one): Selective liberation of cyclic carbonate monomer from polymer chain end

Macromolecules

Volumn 37, Issue 2, 2004, Pages 251-253

  Sudo, Atsushi ^a   Kataoka, Kyoko ^b   Sanda, Fumio ^c   Endo, Takeshi ^d  

^a KINKI UNIVERSITY   (Japan)

^b TOKYO INSTITUTE OF TECHNOLOGY   (Japan)

^c KYOTO UNIVERSITY   (Japan)

^d YAMAGATA UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

DEPOLYMERIZATION; INITIATORS (CHEMICAL); METHANOL; MOLECULAR WEIGHT; MONOMERS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; OLIGOMERS; POLYMERIZATION; PRECIPITATION (CHEMICAL); SIZE EXCLUSION CHROMATOGRAPHY;

CYCLIC CARBONATES; HYDROXYL GROUP; POTASSIUM TERTBUTOXIDE; TETRAHYDROFURAN;

ORGANIC POLYMERS;

EID: 0442295478     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma035049e     Document Type: Article

References (13)

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9. For the recent work by the other authors, see: Kanoh, S.; Nishimura, T.; Senda, H.; Ogawa, H.; Motoi, M.; Tanaka, T.; Kano, K. Macromolecules 1999, 32, 2438.
10. Enzymatic degradation of polycarbonate is also of recent great interest. Tsutsumi, C.; Nakagawa, K.; Shirahama, H.; Yasuda, H. Macromol. Biosci. 2002, 2, 223.
11. 2 has been found to be an effective promoter in polymerizations of cyclic lactones and cyclic carbonates using alcohol as an initiator; Shibasaki, Y.; Sanada, H.; Yokoi, M.; Sanda, F.; Endo, T. Macromolecules 2000, 33, 4316.
12. n were identical with those of 1a. For acetylation of the solid-supported polymer 3a, dichloromethane and 4-(dimethylamino)pyridine (DMAP) were additionally used as a solvent and a catalyst, respectively.
13. 2 and swelled in THF (3 mL). To this THF dispersion of the beads, a THF solution (2 mL) of EP6CC (206 mg, 1.0 mmol) was added. The mixture was shaken at -40°C for 3 h. The reaction was quenched by addition of saturated aqueous solution of ammonium chloride/methanol (1/9 (v/v), 0.1 mL). The beads were filtered, washed by THF and methanol, and dried under vacuum to give 3a (187 mg).