Effect of magnetic nanoparticles on the thermal properties of some hydrogels

被引：52

作者：

Goiti, E. ^{[1
]}

Salinas, M. M. ^{[1
,2
]}

Arias, G. ^{[3
]}

Puglia, D. ^{[2
]}

Kenny, J. M. ^{[2
]}

Mijangos, C. ^{[1
]}

机构：

[1] CSIC, Inst Ciencia & Tecnol Polimeros, E-28006 Madrid, Spain

[2] Univ Perugia, INSTM, Ctr Mat Sci & Technol, UdR Perugia, I-05100 Terni, Italy

[3] CIQA, Saltillo, Coahuila, Mexico

来源：

POLYMER DEGRADATION AND STABILITY | 2007年 / 92卷 / 12期

关键词：

ferrogel; polyvinyl alcohol; polyhydroxyethyl methacrylate; magnetite nanoparticles; thermal degradation;

D O I：

10.1016/j.polymdegradstab.2007.02.025

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Magnetic hydrogels (ferrogels) based on poly(vinyl alcohol) (PVA) and poly(hydroxyethyl methacrylate) (PHEMA) with magnetite (Fe3O4) nanoparticles were prepared. PVA ferrogels were synthesised by submitting the aqueous solution of polymer and Fe3O4 to freezing-thawing (F-T) cycles yielding a physical gel. Different samples were prepared by varying (i) the concentration of PVA, (ii) the concentration of magnetite and (iii) the number of F-T cycles applied. PHEMA ferrogels were prepared by a crosslinking polymerization reaction in the presence of magnetite yielding chemical gels. Different samples were prepared by varying (i) the concentration of HEMA, (ii) the concentration of EGDMA and (iii) the concentration of magnetite nanoparticles. All ferrogel samples were first dried before been analysed in a thermogravimetric analyzer. The resulting thermograms showed that the concentration of magnetite nanoparticles does affect the thermal stability of either ferrogel system, a general improvement in comparison with PVA and PHEMA hydrogels, respectively, being observed. The apparent activation energy(E-a) of the thermal degradation for PVA ferrogels was evaluated and calculated applying the Flynn-Wall and the Kissinger methods. Values of apparent E-a increased with the content of Fe3O4 in the ferrogel sample. (C) 2007 Published by Elsevier Ltd.

引用

页码：2198 / 2205

页数：8

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