FTIR spectroscopy characterization of poly (vinyl alcohol) hydrogel with different hydrolysis degree and chemically crosslinked with glutaraldehyde

Cross-linked poly(vinyl alcohol)/sulfonated nanoporous silica hybrid membranes for proton exchange membrane fuel cell

“…The cross-linked membrane exhibits the characteristic bands at around 1,200-1,250 cm -1 due to the C-O-C group between the alcohol groups of PVA and the aldehyde groups of GLA [27]. The absorption peak at 2,870 cm -1 can confirm the free aldehyde groups [26]. The presence of sulfonic acid group in M 4 membrane was confirmed by the characteristic asymmetric and symmetric S=O stretching vibrations at 1,145 and 1,030 cm -1 .…”

“…The bands occurring at around 3,200 cm -1 (characteristic of O-H stretching vibration) are corresponding to the O-H stretching frequency, which indicates the presence of hydroxyl groups. After cross-linking with GLA, intensity of the O-H stretching vibration band is reduced and shifted to a higher wave number [26]. The cross-linked membrane exhibits the characteristic bands at around 1,200-1,250 cm -1 due to the C-O-C group between the alcohol groups of PVA and the aldehyde groups of GLA [27].…”

Friction behaviour of hydrophilic lubricious coatings for medical device applications

“…It is apparent from previous research into biomechanical modelling and the development of synthetic blood vessels for clinicians' training devices that PVA hydrogel can be used to simulate the interior of blood vessels [32][33][34]. In addition to having similar mechanical properties, PVA hydrogels have a high water content resulting in a low surface friction resistance and low interfacial energy with water or biological fluids [35], thus these materials canmimic human soft tissues. An important advantage of PVA is the possibility to plan/design its properties by suitable selection of the ratio of hydrogel components, for example by changing the PVA and/or crosslinking agent concentration [36][37][38].…”

DSC-FTIR microspectroscopy used to investigate the heat-induced intramolecular cyclic anhydride formation between Eudragit E and PVA copolymer

“…In the range of 1900-800 cm À1 , peaks at 1732 cm À1 (C¼O stretching), 1435 cm À1 (C-H bending), 1261 and 1248 cm À1 (C-O stretching), 1100-1000 cm À1 (C-O stretching in C-O-H groups and COC groups) and 849 cm À1 (C-H rocking mode) were observed. 20,21 Notably, the peak at 1140 cm À1 has been reported to be related to the crystalline C-O stretching vibration of PVA, which depends on the degree of crystallization in the PVA copolymer. 22,23 After heating to 320 1C, four new peaks at 3545, 1799, 1759 and 1012 cm À1 appeared, and the peak at 849 cm À1 vanished.…”