Superparamagnetic magnetite-divinylbenzene-maleic anhydride copolymer nanocomposites obtained by dispersion polymerization

被引：25

作者：

Donescu, Dan ^{[1
]}

Raditoiu, Valentin ^{[1
]}

Spataru, Catalin Ilie ^{[1
]}

Somoghi, Raluca ^{[1
]}

Ghiurea, Marius ^{[1
]}

Radovici, Constantin ^{[1
]}

Fierascu, Radu Claudiu ^{[1
]}

Schinteie, Gabriel ^{[2
]}

Leca, Aurel ^{[2
]}

Kuncser, Victor ^{[2
]}

机构：

[1] Natl Res & Dev Inst Chem & Petrochem ICECHIM, Bucharest 060021, Romania

[2] Natl Inst Mat Phys, Bucharest 077125, Romania

来源：

EUROPEAN POLYMER JOURNAL | 2012年 / 48卷 / 10期

关键词：

Nanocomposite; Magnetite; Divinylbenzene-Maleic Anhydride copolymer; Dispersion polymerization; Superparamagnetic; FE3O4; NANOPARTICLES; MICROSPHERES; PARTICLES;

D O I：

10.1016/j.eurpolymj.2012.07.012

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Magnetite alternating copolymers divinylbenzene-maleic anhydride (DVB-MA) composites were prepared by dispersion polymerization. Because magnetite is used as a complex with oleic acid (Fe(3)O(4)OLA), the final hybrids show good dispersion of inorganic nanofillers in the polymer matrix. The obtained composites were analyzed by infrared absorption spectrometry, diffuse reflectance in visible light, thermogravimetry, X-ray fluorescence, X-ray diffraction, dynamic light scattering, scanning electron microscopy and vibrating sample magnetometry. The obtained results indicate the successful preparation of magnetite nanoparticles with an average size of about 23 nm dispersed in micrometer size copolymer spherical particles, which relative content can be controlled via the processing parameters. A relationship between the relative content of magnetite nanoparticles and the size of the polymer particles, with direct influence on the diffuse reflectance in the visible domain, was observed. A superparamagnetic behavior was evidenced at room temperature with a blocking temperature lower than as expected from the bulk anisotropy constant and the average size of the magnetite nanoparticles. Both the unexpected low blocking temperature and the observed low specific magnetizations were explained by a defected and poor crystalline structure of the magnetite nanoparticles, giving rise to spin disorder and diminished crystalline anisotropy constant. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：1709 / 1716

页数：8

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