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Effects of organic encapsulation on the properties of magnetic PLLA/Fe 3 O 4 composites
Author(s) -
Zhang Jing,
Yu Demei,
Lv Anlin,
Xie Yunchuan,
Hu Guohe,
Liang Honglu,
Min Chao
Publication year - 2010
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21519
Subject(s) - materials science , composite number , composite material , scanning electron microscope , thermal stability , crystallinity , toughness , polymer , polylactic acid , elongation , ultimate tensile strength , chemical engineering , engineering
Organic‐encapsulated Fe 3 O 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 3 O 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 3 O 4 content in the matrix, but not the types of the filling particles. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers