SYNTHESIS OF HIGH-MOLECULAR-WEIGHT NYLON-6 BY ANIONIC-POLYMERIZATION OF EPSILON-CAPROLACTAM - FORMATION OF CYCLIC OLIGOMERS

Authors
UEDA K HOSODA M MATSUDA T TAI K
Citation
K. Ueda et al., SYNTHESIS OF HIGH-MOLECULAR-WEIGHT NYLON-6 BY ANIONIC-POLYMERIZATION OF EPSILON-CAPROLACTAM - FORMATION OF CYCLIC OLIGOMERS, Polymer Journal, 30(3), 1998, pp. 186-191
Citations number
27
Categorie Soggetti
Polymer Sciences
Journal title
Polymer Journal → ACNP
ISSN journal
00323896
Volume
30
Issue
3
Year of publication
1998
Pages
186 - 191
Database
ISI
SICI code
0032-3896(1998)30:3<186:SOHNBA>2.0.ZU;2-8
Abstract
The formation of cyclic oligomers in the process of the anionic polyme rization of E-caprolactam was studied. Cyclic oligomer contents increa sed with chain initiator concentration and decrease in catalyst concen tration. Cyclic dimer content was much higher than that of cyclic trim er to cyclic hexamer and sensitively influenced by the concentrations of catalyst and chain initiator in comparison with cyclic trimer to cy clic hexamer. A mechanism is proposed in which cyclic dimer is peculia rly formed at the acyl-lactam terminal group.