Ultrasonic attenuation and mobility in polymer solutions and dispersions. Poly(vinyl alcohol) and poly(vinyl acetate)

Relaxation study of aqueous solutions of poly(ethylene oxide) by ultrasonic

“…This is attributed to the normal mode of motion of non-free draining coil[ll 1. Moreover, the absorption of ultrasound in liquid polymers and polymers in solutions was connected witli local modes of motion (segmental conformation change) [12], and with cooperative movement of the whole molecule [13]. In this case the PEO macromolecule could be affected by intcrchain forces, and one PEO molecule may influence another by mutual interaction.…”

Ultrasonic study of molecular association of polystyrene solutions in benzene

“…Ultrasonic relaxation in disolved polystyrene can be explained in terms of viscoelastic normal mode contribution and a COIIformational relaxation; this latter can be assigned to specific isornerizatior~s which are relatively insensitive to solvent, and are dependent on the chain length in short chains occurring only in certain sections of the chain below a transition region [20].…”

A simple derivation of the critical condition for the ultrasonic atomization of polymer solutions

“…2(c)). As listed in Table 1 [21][22][23]. Therefore, it appears that at 2.5 wt.% PVA, the acoustic pressure at the surface of the liquid becomes insufficient to overcome the surface tension, and thus ultrasonic atomization does not work.…”