Effects of organic encapsulation on the properties of magnetic PLLA/ 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 P...

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Bibliographic Details
Published in:Polymer engineering and science 2010-02, Vol.50 (2), p.215
Main Authors: Zhang, Jing, Yu, Demei, Lv, Anlin, Xie, Yunchuan, Hu, Guohe, Liang, Honglu, Min, Chao
Format: Article
Language:English
Subjects:
Chemical properties
Composite materials
Composition
Lactic acid
Magnetic properties
Microspheres
Production processes
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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. POLYM. ENG. SCI., 50:215-221, 2010. [C]2009 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.21519