Effects of Organic Encapsulation on the Properties of Magnetic PLLA/Fe^sub 3^O^sub 4^ Composites

Organic-encapsulated Fe^sub 3^O^sub 4^ magnetic microspheres (MMS) were synthesized and used to prepare PLLA (poly (L-lactic acid))/MMS composites. The effects of organic encapsulation on the mechanical, thermal, and magnetic properties of the composites were investigated. When compared with the PLL...

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Bibliographic Details
Published inPolymer engineering and science Vol. 50; no. 2; p. 215
Main Authors Zhang, Jing, Yu, Demei, Lv, Anlin, Xie, Yunchuan, Hu, Guohe, Liang, Honglu, Min, Chao
Format Journal Article
LanguageEnglish
Published Newtown Blackwell Publishing Ltd 01.02.2010
Subjects
Composite materials
Magnetism
Materials science
Polylactic acid
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Summary:Organic-encapsulated Fe^sub 3^O^sub 4^ magnetic microspheres (MMS) were synthesized and used to prepare PLLA (poly (L-lactic acid))/MMS composites. The effects of organic encapsulation on the mechanical, thermal, and magnetic properties of the composites were investigated. When compared with the PLLA/Fe^sub 3^O^sub 4^ composite, the elongation ratio of the PLLA/MMS composite improved significantly (by nearly 300%). Scanning electron microscope (SEM) images of the fracture morphology revealed an interesting "silking'' phenomenon within the PLLA/MMS composite, which explains the greatly improved toughness. The decreased crystallinity and increased thermal stability of the PLLA/MMS composite suggest the existence of strong interacting forces between the PLLA molecules and the organic layer of the MMS particles, thereby limiting the mobility of the macromolecular chains. A study of the composites' magnetic properties indicated that the saturation magnetization was determined by the relative Fe^sub 3^O^sub 4^ content in the matrix, but not the types of the filling particles. [PUBLICATION ABSTRACT]
ISSN:0032-3888
1548-2634