A comparison between 13C NMR spectra of polymer solutions and Fourier transform infrared spectra of polymer films for several ethene–butadiene copolymers, including most butadiene as 1,2-cyclopropane and 1,2-cyclopentane units, is presented. This spectral comparison, also with the help of a low-molecular-mass model compound specifically synthesized for this purpose, has allowed to locate infrared absorbances associated with the cyclic comonomer units. In particular, a satisfactory calibration curve for evaluation of the amount of the reactive cyclopropane units, from the absorbance of the 1020 cmK1 band, has been achieved. An analysis of 1,2-cyclopropane unit reactivity in annealed films, has also pointed out that the presence of remnants of the polymerization catalyst can produce large increase in cyclopropane reactivity. q 2006 Elsevier Ltd. All rights reserved.
Infrared spectra and thermal reactivity of ethene copolymers containing 1,2-cyclopropane units
CAVALLO, GABRIELLA;
2006-01-01
Abstract
A comparison between 13C NMR spectra of polymer solutions and Fourier transform infrared spectra of polymer films for several ethene–butadiene copolymers, including most butadiene as 1,2-cyclopropane and 1,2-cyclopentane units, is presented. This spectral comparison, also with the help of a low-molecular-mass model compound specifically synthesized for this purpose, has allowed to locate infrared absorbances associated with the cyclic comonomer units. In particular, a satisfactory calibration curve for evaluation of the amount of the reactive cyclopropane units, from the absorbance of the 1020 cmK1 band, has been achieved. An analysis of 1,2-cyclopropane unit reactivity in annealed films, has also pointed out that the presence of remnants of the polymerization catalyst can produce large increase in cyclopropane reactivity. q 2006 Elsevier Ltd. All rights reserved.File | Dimensione | Formato | |
---|---|---|---|
Polymer_2006_47_2274.pdf
Accesso riservato
:
Altro materiale allegato
Dimensione
400.88 kB
Formato
Adobe PDF
|
400.88 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.