Viscoelastic properties of poly(vinyl alcohol) hydrogels and ferrogels obtained through freezing–thawing cycles

摘要: Abstract We report the preparation of poly(vinyl alcohol) (PVA) hydrogels obtained through freezing–thawing cycles. The viscoelastic properties these gels using parallel-plate shear mode were evaluated as a function temperature, time, degree swelling, concentration and number storage modulus was analyzed on basis theoretical model based scaling approach. These results provide additional evidence for non-crystalline nature structure PVA cryogels. Furthermore, ferrogels have been prepared from aqueous solutions ferrofluid materials evaluated. It is shown that variation with cannot be fitted classical theories what has attributed to small dimensions particles in magnetic interactions between particles.