The effect of poly(acrylic acid) (PAA)

poly (allylamine) (PEI) and poly (vinyl alcohol) (PVA) on the ice recrystallization (IR) were studied. The results showed that the IR inhibition activity gradually increased with the increase of polymer solution concentration. Compared with the weak IR inhibition activity of PAA and PEI

PVA was a very effective inhibitor of IR. PVA with higher alcoholysis degree could inhibit IR much more effectively. The water mobility was detected by

1

H-NMR

namely

water proton spin-spin relaxation times (T

2

). As the proportion of hydroxyl groups increased

the IR inhibition activity of PVA increased due to the reduced mobility of water molecules.