Structural study of poly(vinyl alcohol) in the gel state by high-resolution solid-state 13C NMR spectroscopy

CP/MAS13C NMR analyses of hydrogen bonding and the chain conformation in the crystalline and noncrystalline regions for poly(vinyl alcohol) films

“…More detailed discussion about the intramolecular hydrogen bonding in the crystalline and noncrystalline regions is performed later. In the gel state of PVA, different assignments for lines I, II, and III were proposed but the experimental results supporting these assignments seem not to be clearly described 21. It should also be noted here that an upfield shoulder of the CH 2 line for the films prepared from the DMSO solution [Figure 1(c)] is attributed to a trace of residual DMSO.…”

Synthesis and characterization of novel, highly crystalline poly(vinyl alcohol) microspheres for chemoembolization therapy

“…It was proposed in the literature that the chemical shifts at 77, 71, and 65 ppm observed for solid PVA originated from the intramolecular and intermolecular hydrogen bonding of the CH carbon to the hydroxyl groups. [36][37][38] The chemical shift at 77 ppm was assigned to the CH carbon with two intramolecular hydrogen bonds with the hydroxyl groups. The chemical shift at 71 ppm was assigned to the CH carbon with one intermolecular hydrogen bond with the hydroxyl group, whereas the chemical shift at 65 ppm was not assigned or related to any hydrogen bond with the hydroxyl groups in the crosslinked region.…”

A Brief History of Polymeric Cryogels

“…2. Intermolecular H-bonding via the interactions of OH groups of the neighboring PVA chains plays a key role in the formation of PVA cryogels [305][306][307][308][309]. 3.…”