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Structural Organization of Poly(vinyl alcohol) Hydrogels Obtained by Freezing/Thawing and γ-Irradiation Processes: A Small-Angle Neutron Scattering (SANS) Study

Puspitasari, T. and Raja, K.M.L. and Pangerteni, D.S. and Patriati, A. and Putra, E.G.R. (2012) Structural Organization of Poly(vinyl alcohol) Hydrogels Obtained by Freezing/Thawing and γ-Irradiation Processes: A Small-Angle Neutron Scattering (SANS) Study. Procedia Chemistry, 4. pp. 186-193. ISSN 18766196

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Abstract

The structural organization of poly(vinil alcohol) (PVA) hydrogels obtained by repeatedly freeze/thaw and γ-irradiation processes of 15% w/w PVA solution in D2O has been revealed by small-angle neutron scattering (SANS) technique. The opaque sample is due two separated phases which composed by polymer-rich and polymerpoor regions occurred from freezing/thawing samples, while transparent sample formed from irradiated PVA hydrogels sample. It has been pointed out from SANS experimental data that the cross-linking in the gels formed by freezing/thawing process are crystallites as the scattering intensity I(Q) decreases with the momentum transfer Q according to the -4th power law (Porod's law) in the high Q-range region. From SANS data analysis, the radius of the crystallite size is about 28 - 33Å and its distributed inhomogeneously with the average distance of 150 - 175Å in the polymer-rich phase that consisted by crystalline PVA aggregates and swollen amorphous PVA. In opposite, the irradiated PVA hydrogels with the irradiation dose of 40 kGy did not show a -4th power law scattering due to in absence of crystalline and amorphous PVA phases in the polymer-rich region.

Item Type: Article
Subjects: Daur Bahan Bakar Nuklir dan Bahan Maju > Bahan Struktur dan Bahan Maju > Teknik Sintesis Bahan Maju
Divisions: Pusat Sains dan Teknologi Bahan Maju
Depositing User: EDITOR PSTBM BATAN
Date Deposited: 01 Dec 2018 11:45
Last Modified: 01 Dec 2018 11:45
URI: http://repo-nkm.batan.go.id/id/eprint/7172

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