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 means of researchers within the biopolymers, PVA hydrogels, anionic polymerisation, and nanocomposites.
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Additional info for Biopolymers/PVA Hydrogels/Anionic Polymerisation/ Nanocomposites
When considering the stability, several issues were addressed including the possible dissolution of PVA, melting out of crystalline regions, and additional crystallization during swelling at long times. In addition, structure and stability have been related to the use of such materials as carriers for drug delivery . 54 Christie M. Hassan, Nikolaos A. Peppas Although the work of Mallapragada and Peppas [24, 86] did not involve pure PVA gels prepared by freezing and thawing techniques, the analysis and results obtained are quite applicable to the current research.
The intensity of the peak at 1141 cm±1 in the IR spectrum of PVA depends on the degree of crystallinity. It has been proposed that the band arises from a C±C stretching mode and increases with an increase in the degree of crystallinity . A method for determining degrees of crystallinity from ATR-FTIR spectra has been further discussed by Peppas . The height of the peak at 1141 cm±1 is analyzed in terms of the height of the peak at 1425 cm±1 which remains constant. X-ray analysis has also been used for films and fibers of PVA.
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. Therefore, PVA is produced by the polymerization of vinyl acetate to poly(vinyl acetate) (PVAc), followed by hydrolysis of PVAc to PVA.