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8.1 Polymer Blends > 8.1.5 IR Spectrum of Nylon 4, 6 and Ethylvinylalcohol (EVO...

8.1.5. IR Spectrum of Nylon 4,6 and Ethylvinylalcohol (EVOH)

Figure 8.6 [23] shows the relative intensity of the IR peak around the 1700 cm–1 region for a blend of nylon 4,6 and ethylvinylalcohol (EVOH). The peaks of the carbonyl group in EVOH shift to lower wave number up to 35% of nylon 4,6 content by 10 cm–1, but no shift in the peaks is observed for the blends having more than 65% nylon 4,6.


Figure 8.6. Relative intensity of the peak around 1700 cm–1 of nylon 4,6/EVOH blends on IR spectrum as a function of blend concentrations. [Reprinted with permission from C.-S. Ha, M.-G. Ko, and W.-J. Cho, Polymer 38, 1243 (1997). Copyright © 1997 Elsevier Ltd. All rights reserved.]

The peak shift suggests that there exists some interaction between EVOH and nylon at higher EVOH contents. The interaction is also evidenced with 85% and 65% EVOH, indicating a strong interaction. When the composition of the blend is more than 35% nylon 4,6, however, the interaction between the components becomes weaker with increasing nylon 4,6 concentration. This suggests that a certain molecular interaction exists between the N–H group of nylon 4,6 and the C–O group of EVOH. It is suggested that these interactions are hydrogen bonding and/or dipole-–dipole interactions between the C–O group of EVOH and the N–H group in nylon4,6, and that these interactions may vary with the concentration of the blend.


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