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Living ring-opening polymerization of L,L-lactide initiated with potassium t-butoxide and its 18-crown-6 complex

Sipos, L., Zsuga, M., Kelen, T.: Living ring-opening polymerization of L,L-lactide initiated with potassium t-butoxide and its 18-crown-6 complex.
Polym. Bull. 27 (5), 495-502, 1992.
cím:
Living ring-opening polymerization of L,L-lactide initiated with potassium t-butoxide and its 18-crown-6 complex
szerzők:
  • Sipos L.
  • Zsuga Miklós
  • Kelen Tibor
levelező szerző:
Kelen Tibor
kiadás éve:
1992
típus:
folyóiratcikk
műfaj:
idegen nyelvű folyóiratközlemény külföldi lapban
folyóirat:
Polymer Bulletin (ISSN: 0170-0839, 1436-2449)
nyelv:
angol
MAB:
természettudományok, kémiai tudományok
absztrakt:
Living polymerization of L,L-lactide initiated by potasium t-butoxide and its 18-crown-6 complex was investigated in THF solution at room temperature. The results support a reversible polymerization mechanism consisting of first order in monomer propagation and of unimolecular depropagation. The presence of 18-crown-6 has a strong MWD narrowing effect (Mw/Mn<1.2), slows down the overall rate of polymerization and gives rise to slow initiation. The polymerizations yield optically pure polymers both in the presence and absence of 18-crown-6.
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