Infrared spectroscopy of ethylene–vinyl chloride copolymers

Autor: Alan E. Tonelli, Trevor N. Bowmer
Rok vydání: 1986
Předmět:
Zdroj: Journal of Polymer Science Part B: Polymer Physics. 24:1631-1650
ISSN: 1099-0488
0887-6266
DOI: 10.1002/polb.1986.090240801
Popis: This paper continues an investigation into the ethylene–vinyl chloride copolymers prepared by partial reduction of poly(vinyl chloride). The infrared spectra of the copolymers have been obtained and the individual resonances assigned. Each infrared band has been quantitatively analyzed in terms of peak position (cm−1) and intensity, and correlations with the sequence microstructure (dyad, triads, etc.) have been determined. The infrared resonances have been found to be sensitive to long sequences; i.e., (V)x or (E)x where x ≥ 10. Sequences of up to 10–15 monomer units were seen to affect the position (cm−1) and intensity of CH stretching and bending frequencies. Methylene rocking bands between 850 and 700 cm−1 were observed to be sequence dependent with V(E)xV resonanting at 860, 750, or 730 cm−1 for x = 0, 1 and 2, or ≥3, respectively. The CCl stretching resonances, which are well known for their conformational complexity in pure PVC, were found to be dominated by sequence length effects reducing to two bands at 665 and 610 cm−1 characteristic of and isolated CHCl unit in a long methylene chain.
Databáze: OpenAIRE
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