A study of cryostructuring of polymer systems. 37. Composite cryogels formed from dispersions of poly(butadiene-co-styrene) latex in aqueous poly(vinyl alcohol) solution

作者：Podorozhko E A^*; D'yakonova E A; Lozinsky V I

来源：Colloid Journal, 2015, 77(1): 46-57.

DOI：10.1134/S1061933X15010111

Composite macroporous poly(vinyl alcohol) (PVA) cryogels have been prepared by cryogenic treatment (freezing at -20A degrees C for 12 h followed by thawing at a rate of 0.03A degrees C/min) of mixtures of an aqueous PVA solution and poly(butadiene-co-styrene) latex. The values of the elasticity modulus and fusion temperature have been determined for the obtained samples, and their microstructures have been studied by optical microscopy of thin sections. The rigidity and heat endurance of the filled cryogels have been shown to markedly increase with the fraction of the latex in the initial liquid disperse system. Moreover, it has been found that, beginning from some critical concentration of the latex in a mixture with the initial PVA solution, cryostructuring leads to the formation of two interpenetrating phases-a continuous phase of the hydrophilic PVA cryogel and a network of the hydrophobic phase that results from cryocoagulation of non-frost-resistant poly(butadiene-co-styrene) latex. The morphological features of this phase have been studied, and the sizes of macropores and the thicknesses of their walls have been determined with the help of scanning electron microscopy.

• 出版日期2015-1