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
Provides current and destiny developments in polymer technology, with a set of papers contributed through researchers within the biopolymers, PVA hydrogels, anionic polymerisation, and nanocomposites.
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Extra info for Biopolymers/PVA Hydrogels/Anionic Polymerisation/ Nanocomposites
In another study, poly(L-lysine) having pendant nucleic acid bases was immobilized on silica gel and employed in packing the columns . Oligoethylenimine derivatives having nucleic acid bases were separated successfully with the column in the methanol mobile phase. 2 Template Polymerization The specific interactions between complementary bases were also applied to template polymerization . Three paths for the template polymerization of a monomer having uracil in the presence of the template having adenine are possible; in path (a) the polymerization takes place after base pairing of the monomers with the bases on the template.
Peppas Table 1. 269 g/cm3 for 100% amorphous PVA. The degree of crystallinity, X, of PVA on a dry basis is: 1 X 1ÀX g c a 1 where rg is the density of the sample. This can be modified for PVA hydrogels where the additivity of the volumes of PVA and water is assumed: 1 1 À WPVA WPVA h H 2 O g 2 Here, rh is the density of the hydrogel, WPVA is the weight percentage of PVA in the sample, and rH2O is the density of water. Calorimetric methods can also be used to determine the crystallinity of PVA films.
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.