On the stereoregulation in polymerization of vinyl formate

The effect of annealing on the structure and relaxation processes of vinyl alcohol-ethylene copolymers

“…It is also viewed that the quenched specimens absorbed more water than the slowly cooled ones because of the higher crystallinity 1,2 in the latter ones, because water absorption takes place in the amorphous phase. 3 As expected, samples just molten absorbed less water than those previously prepared. Though absorbed water content is not high (less than 2.25%), samples have been placed in a desiccator at 80°C under vacuum to study the effect of such amount of water.…”

The effect of residual acetate groups on the structure and properties of vinyl alcohol-ethylene copolymers

“…It is also viewed that the quenched specimens absorbed more water than the slowly cooled ones because of the higher crystallinity in the latter ones, since water absorption takes place in the amorphous phase. 8,9 As expected, samples just molten absorbed less water than those previously prepared because the hydrogen bonds are weakened by interaction with environmental water. Consequently, the shorter interaction time corresponding to just molten specimens, the lesser intra-and intermolecular bonds weakening.…”

Water-Soluble Poly(vinyl alcohol)/Biomass Waste Composites: A New Route toward Ecofriendly Materials

“…As shown in Figure a and b, PVA with a lower molecular weight and an 88% alcoholysis degree exhibited considerable mass loss, while that with a 99% alcoholysis degree took four days. As demonstrated by Fuji, the crystallinity and interchain hydrogen bonding exhibited a determining effect on the water solubility of PVA. The stronger intermolecular interaction in PVA with a 99% degree of alcoholysis, high crystallinity, and a high molecule weight consequently led to poor water solubility.…”