Biopolymers/PVA Hydrogels/Anionic Polymerisation/ by J.Y. Chang, D.Y. Godovsky, M.J. Han, C.M. Hassan, J. Kim, B.

By J.Y. Chang, D.Y. Godovsky, M.J. Han, C.M. Hassan, J. Kim, B. Lee, Y. Lee, N.A. Peppas, R.P. Quirk, T. Yoo

Offers current and destiny developments in polymer technology, with a set of papers contributed by way of researchers within the biopolymers, PVA hydrogels, anionic polymerisation, and nanocomposites.

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Additional work by Hyon et al. [46] further examined the preparation of such PVA gels due to crystallization at low temperatures. Other contributions have been made concerning the characterization of PVA gels prepared by freezing and thawing techniques in the presence of other solvents. In particular, Berghmans and Stoks [47] described a two-step mechanism for the gelation of PVA gels in the presence of ethylene glycol. The first step involves a liquid-liquid phase separation that occurs as the gel turns opaque.

Rhodes W (1961) J Am Chem Soc 83:3609 34. Bush CA (174) In: Ts'o POP (ed) Basic principles in nucleic acid chemistry. Academic, New York, vol II, chap 2 35. Browne DT, Eisinger J, Leonard NJ (1968) J Am Chem Soc 90:7302 36. Inaki Y, Renge T, Kondo K, Takemoto K (1975) Makromol Chem 176:2683 37. MacDonald JR, Echols WE, Price TR, Fox RB (1972) J Chem Phys 57:1746 38. Iyata T, Ochiai H, Ueda K, Imamura A (1993) Macromolecules 26:6021 39. Riley M, Mailing B, Charmberin MJ (1966) J Mol Biol 20:359 40.

61 References . . . . . . . . . . . . . . . . . . . 62 Advances in Polymer Science, Vol. 153 # Springer-Verlag Berlin Heidelberg 2000 38 Christie M. Hassan, Nikolaos A. Peppas 1 Structure and Properties of Poly(vinyl alcohol) (PVA) Poly(vinyl alcohol) (PVA) has a relatively simple chemical structure with a pendant hydroxyl group. The monomer, vinyl alcohol, does not exist in a stable form rearranging to its tautomer, acetaldehyde.

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