ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The kinetics and yields of N-trifluoracetylation of polyamides, polyesteramides, polyurethanes were studied by direct titration of trifluoracetic acid formed during the conversion. For polycaprolactam a limiting yield, corresponding to a complete substitution, was always achieved, independently of polymer molecular mass. The functionalization was equally effective on ultra high molecular masses or “gels”, as well as on low molecular mass compounds (monomer and higher oligomers), making possible their fast detection in any polycaprolactam sample. As the reaction starts and proceeds for most of its time in the heterogeneous phase, the substitution rate was found to be strongly dependent on the size of polymer particles. Extension of the above reaction to polyurethanes revealed that they react much slower than aliphatic polyamides, showing relevant differences in the behaviour of aromatic and aliphatic moieties.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1983.021840609
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