Is PVA thermoplastic

Answer 1

Strictly speaking, yes, PVA (polyvinyl alcohol) is thermoplastic. It is in its natural state however exceedingly difficult to process via conventional means (say, injection molding), as there is a very narrow window of temperature where the material is hot enough to melt, yet cool enough not to have severe thermal degradation. The resulting melt of pure PVA is of very high viscosity as well, and thus does not flow well to fill anything but the smallest mold cavities.