Hydrogen bonding between both polymer components leads to significant spectral modification in pyridine rings spectral bands. Minor modifications in other spectral modes have been also detected. The spectral results indicate at least three competing equilibria processes in the blends: hydroxyl-hydroxyl ...
FTIR analysis of hydrogen bonding in amorphous linear aromatic polyurethanes. I. Influence of temperature. Journal of Polymer Science Part B: Polymer Physics, v. 32, p. 1305-1313, 1994.Wang F C,Feve M,Lam T M,Pascault J P.FTIR analysis of hydrogen bonding in amorphous linear aromatic ...
(terahertz waves) corresponds to hydrogen bonding and Van der Waals forces believed to hold the key to an understanding of the functional expressions of and structural changes in biological molecules in liquids, as well as absorption energy in hydrophobic interactions.Calculations, generally theoretical,...
In aqueous media, interactions of the hydrophilic side chains with water are maximized through hydrogen bonding, while interactions of hydrophobic side groups are minimized. The protein secondary structure of aqueous free-BSA had the α-helix conformation as the prevalent form (Fig. 2C), with ...
experiments employing a 1:1 mixture of H2O and D2O, the derivative-shaped feature was attributed to a water molecule coupled or bound to the Mn4CaO5 cluster that has an asymmetric hydrogen-bonding structure in the S1 state and an even greater asymmetry of hydrogen-bonding in the S2 state [...
Furthermore, the sensitivity of the Amide I band to subtle differences in hydrogen bonding enables discrimination between different β-sheet conformations, including intramolecular and intermolecular β-sheet. Compared to other methods for secondary structure determination, such as circular dichroism, this ...
第4期 弹性体1997年第7卷 分析与测试 FTIR 3 (,266042 杨光华 (石油大学, 北京102200 外对其结构的研究表明:N-H 振动区, 羰基区和醚链区各特征基团吸收谱带的位置, 峰形都会随温度的变化发生改变。FTIR 对反应过程中反应基团NCO 吸收峰(V ～2275cm -1 面积的减小, 脲羰基峰面积的增加进行快速定量扫描跟踪...
The intensity and position of these bands, determined by backbone confirmation of the hydrogen bonding pattern change with malignancies13,42. Amide I band position shifts towards the lower wavenumber due to malignancy (see supplementary materials Fig. S1). The average position of amide I representing...
FTIR. MDI/BD blocks may dissociate or reorganize during heating [21], which can be characterized by hydrogen bonding formation amongst them. Thus, in-situ FTIR was employed to monitor the variation of hydrogen bonding with increasing temperature. Fig. 5 shows the band variation of the CO group...
The research also discusses spectral and chemical changes in the PEU binder layer between SSS tapes, non-SSS, and SSS tapes treated by baking including changes in hydrogen bonding of the carbonyl groups. The results support chemical/physical changes occurring in the soft segment of the PEU binder...