Polymerization of Lactams: 57. G.l.c. and n.m.r. analysis of the anionic copolymers of 2-pyrrolidone with 6-caprolactam and 8-octanelactam

The activated anionic copolymerization of 2-pyrrolidone (PD) with 6-caprolactam (CL) or 8-octanelactam (OL) proceeds even above the ceiling temperature for PD homopolymerization. At high temperatures, the copolymerizations are accompanied by the depolymerization of PD sequences, which is more pronou...

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Bibliographic Details
Published in:Polymer (Guilford) 1983, Vol.24 (11), p.1491-1494
Main Authors: Chuchma, F., Trška, P., Roda, J., Králíček, J.
Format: Article
Language:English
Subjects:
1H and 13C nuclear magnetic resonance spectroscopy
2-pyrrolidone and 6-caprolactam
2-pyrrolidone and 8-octanelactam
Activated anionic copolymerization
copolymers
gas liquid chromatographic analysis
sequence analysis
spectroscopic analysis
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Summary:The activated anionic copolymerization of 2-pyrrolidone (PD) with 6-caprolactam (CL) or 8-octanelactam (OL) proceeds even above the ceiling temperature for PD homopolymerization. At high temperatures, the copolymerizations are accompanied by the depolymerization of PD sequences, which is more pronounced with the copolymers with CL. The copolymers obtained probably exhibit a constitutional heterogeneity and contain considerable amounts of low-molecular weight fractions. This may be the reason why the content of comonomers in the prepared copolymers determined by g.l.c. did not agree with that found by 1H n.m.r. or 13C n.m.r. spectroscopy. The copolymers with CL had in part a block structure and also an alternating character, depending on temperature and polymerization time, while random copolymers were obtained at high temperatures. The copolymers with OL tended mostly to alternation.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(83)90236-7