The swelling and mechanical properties of poly(vinyl alcohol) (PVA) hydrogel, and PVA gels obtained by swelling precursors in various solvents were investigated. On the basis of the experimental results, the structure of the gels in various solvents was estimated. PVA gels have a uniform structure with flexible PVA chains in a mixed solvent of dimethyl sulphoxide (DMSO) and water. On the other hand, those swollen in methanol, ethanol and formamide have a two-phase structure, which is composed of PVA-rich and solvent-rich phases. The PVA chains in the PVA-rich phase are crosslinked by hydrogen bonding.
Посилання на статтю:
Structure and mechanical properties of poly(vinyl alcohol) gels swollen by various solvents / Toshikazu Takigawa, Hisahiko Kashihara, Kenji Urayamaand Toshiro Masuda // Polymer. – 1992. – Vol 33. – P. 2334-2339.