ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
During the reaction of polyamide 6 or polyamide 6,6 with the bifunctional crosslinking agent 1,5-difluoro-2,4-dinitrobenzene in heterogeneous media, 5-fluoro-2,4-dinitrophenylamino groups and 4,6-dinitro-1,3-phenylenediamino groups are formed within the polymer. Owing to their different VIS-spectroscopic behaviour, the concentration of both groups can be determined by means of a bicomponent analysis, \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {c_1} & {= (15,36 \cdot A_{375} - 6,35 \cdot A_{425}) \cdot 10^{- 5} ({\rm mol} \cdot {\rm dm}^{- 3})} \\ {c_2} & {= (9,48 \cdot A_{425} - 4,78 \cdot A_{375}) \cdot 10^{- 5} ({\rm mol} \cdot {\rm dm}^{- 3})}\\ \end{array}$$\end{document} where c1 and c2 represent the concentration of 5-fluoro-2,4-dinitrophenylamino and 4,6-dinitro-1,3-phenylenediamino groups, respectively, and A375 as well as A425 represent the absorbances at 375 nm and 425 nm, measured in a 1 cm cell (solvent: 2,2,2-trifluoroethanol). N-(5-fluoro-2,4-dinitrophenyl)-ε-aminocaproic acid and N,N'-(4,6-dinitro-1,3-phenylene)-di-ε-aminocaproic acid are used as model compounds in order to calibrate the photometer. It is demonstrated that the degree of crosslinking, determined by means of the bicomponent analysis, is in accordance with the change of molecular weight, determined viscosimetrically.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1980.021811005
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