Polyvinyl alcohol modification with sustainable ketones

Abstract

Water-degradable polyvinyl ketals with high glass transition temperatures (78–127 °C) were made via ketalization of polyvinyl alcohol (PVA) with sustainable ketones.

A novel biomedical compatibilizer (polyvinyl alcohol‐allyl polyethylene glycol graft copolymer) for polyvinyl alcohol/polyethylene oxide composite system

“…In addition, the signal peaks at δ5.13–5.27 are ascribed to the c, d, and f protons in the molecular formula 37,38 . It can be seen from Figure 1c that the proton signal peak at δ1.34–1.45, δ3.34, and δ4.47 are assigned to CH 2 , CH, and OH, respectively 39–41 . As illustrated in Figure 1d, the signal peak of the PVA structure still exists, and only the signal peak at δ3.51 remains in APEG, which is the CH 2 proton in the ethylene glycol unit.…”

“…37,38 It can be seen from Figure 1c that the proton signal peak at δ1.34-1.45, δ3.34, and δ4.47 are assigned to CH 2 , CH, and OH, respectively. [39][40][41] As illustrated in Figure 1d, the signal peak of the PVA structure still exists, and only the signal peak at δ3.51 remains in APEG, which is the CH 2 proton in the ethylene glycol unit. The signal peaks of δ3.94-3.96, δ5.13-5.27, and δ5.82-5.93 in APEG disappeared, indicating that the allyl group in APEG disappeared.…”

Editing of Polymer Backbones

“…55 Poly(vinyl acetal)s-especially poly(vinyl butyral)-have since then become a valuable industrial material, with numerous applications including coatings and adhesives 56 ; development of novel poly(vinyl acetal)s-e.g., more sustainable ones-continues to be a subject of modern research. 57,58 Other condensation-type mechanisms-e.g., aldol condensation, lactonization, and anhydride formation-have been explored in the subsequent years. [59][60][61][62][63][64][65][66][67][68] A seminal example of these studies is the 1960 report by Grant and Grassie on the thermal dehydration of poly(methacrylic acid): using IR spectroscopy, they determined that the predominant product was the formation of sixmembered cyclic anhydrides along the polymer backbone.…”

Augmentation in proton conductivity of crosslinked poly(vinyl alcohol) through the introduction of polyvinyl pyrrolidone

“…To date, researchers have primarily focused on the physicochemical characterization of the materials and have not studied the ionic conductivity. The ketalization of PVA with various ketones has been explored to produce suitable films for water‐degradable packaging materials 19 . The glass transition temperature ( T g ) of PVA increased from 75 to 127°C through ketalization.…”

“…This eventually results in the loss of principal‐chain conformational flexibility. The conformational freedom decreases, and T g increases 19 . The present work aims to crosslink PVA with PVP to form polyvinyl ketal (PVKL) to augment the proton conductivity of PVA.…”