13C NMR spectra of nylon 6/12 copolymers and related model compounds

Autor:	Derek J. Maitland, Isaac Goodman, Aristides H. Kehayoglou
Rok vydání:	2000
Předmět:	Polymers and Plastics Organic Chemistry Nylon 12 General Physics and Astronomy Nuclear magnetic resonance spectroscopy Carbon-13 NMR chemistry.chemical_compound Nylon 6 chemistry Polymerization Polymer chemistry Materials Chemistry Lactam Copolymer Molecule Physical chemistry
Zdroj:	European Polymer Journal. 36:1301-1311
ISSN:	0014-3057
DOI:	10.1016/s0014-3057(99)00194-9
Popis:	The 13C NMR spectra of model mono- to tetra-amides containing CO, (CH2)5 and (CH2)11 groups in varied sequential arrangements have been used to reinterpret assignments previously proposed for signals in the spectra of nylon 6/12 random copolyamides. From the CO signal intensities, the mean nylon 6 and nylon 12 homo-unit block lengths have been determined in copolyamides prepared by rapid (ca. 15 min) activated anionic lactam copolymerisation at 180°C. The results are virtually identical with published data for equilibrium copolymers of similar co-unit ratios made by hydrolytic polymerisation at 260°C in reaction times >144 h. Maximum sequential randomness occurs at ca. 50–60 mol% nylon 6 component, coinciding with minima in the thermal and solid-state properties.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c6eecc2df66f498c8f4df297ca18062 https://doi.org/10.1016/s0014-3057(99)00194-9 Zobrazit plný text záznamu Full Text from ScienceDirect