Characterization of hydrogen bonding in cellulose-synthetic polymer blend systems with regioselectively substituted methylcellulose

Abstract

Specifically substituted O-methylcelluloses, 2,3-di-O-methylcellulose and 6-O-methylcellulose (parts B and C of Figure 1, respectively), were used as cellulosic components in blends with poly (ethylene oxide) (PEO) and poly(vinyl alcohol) (PVA). Since their hydroxyl groups (OH) form controlled intraand intermolecular hydrogen bonds, the cellulose derivatives are useful as model compounds to investigate the effect of hydrogen bonding in cellulose-synthetic polymer blend systems. FTIR (Fourier transform infrared spectroscopy) spectra of the cellulosic-PEO blend films revealed that, while the primary hydroxyl groups at the C-6 position of cellulose interact strongly with ether oxygen in PEO, the secondary hydroxyl groups at the C-2 and C-3 positions show no evidence for polymer-polymer interactions. In the cellulosic-PVA blend films the FTIR analyses suggested that the secondary hydroxyl groups between the cellulose and the PVA were engaged in hydrogen bonds, and, in addition, a hydrogen bond between the anhydroglucose ring oxygen (0-5) of the cellulose and the hydroxyl groups of the PVA was formed. Thus, these results showed the specific regiochemistry of hydroxyl groups in cellulose and its importance to the study of the miscibility in cellulosesynthetic polymer blends.

Fourier Transform Infrared Spectroscopy for Natural Fibres

“…Hydroxyl groups in C2, C3 and C6 contribute to the formation of various kinds of inter-and intra-molecular hydrogen bonds. The formation of inter-and intra-molecular hydrogen bonds in the cellulose not only has a strong influence on the physical properties of cellulose, including solubility [7][8], hydroxyl reactivity [9][10] and crystallinity [11][12], but also plays an important role in the mechanical properties of the cellulose [13]. Calculated by Tashiro and Kobayashi [14] showed that hydrogen bonds contribute about 20% the strain energy to the cellulose.…”

Study on Properties of Poly(vinyl alcohol)/Polyacrylonitrile Blend Film

“…Numerous investigations regarding the miscibility in multicomponent polymer systems have been reported. Among them, the polymer blends between biopolymers and synthetic polymers are of particular significance as they could be used as biomedical and biodegradable materials [11][12][13] .…”

Characterization of Blend Films of Chitin Regenerated from Porous Chitosan with Poly(vinyl alcohol).

“…In the cellulose/PVA blends, two types of hydrogen bonds were reported (22). Then we investigated what kind of intermolecular interaction is present in the r-Ch/PVA blends by means of FT-IR spectrophotometry.…”