The formation of web-like connection among electrospun chitosan/PVA fiber network by the reinforcement of ellipsoidal calcium carbonate

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The electrospun fibers consist of backbone fibers and nano-branch network are synthesized by loading of ellipsoidal calcium carbonate in the mixture of chitosan/poly(vinyl alcohol) (PVA) followed by electrospinning. The synthesized ellipsoidal calcium carbonate is in submicron size (730.7 +/- 152.4 nm for long axis and 212.6 +/- 51.3 nm for short axis). The electrospun backbone fibers experience an increasing in diameter by loading of calcium carbonate from 71.5 +/- 23.4 nm to 281.9 +/- 51.2 nm. The diameters of branch fibers in the web-network range from 15 nm to 65 nm with most distributions of fibers are in 30-35 nm. Calcium carbonate acts as reinforcing agent to improve the mechanical properties of fibers. The optimum value of Young's modulus is found at the incorporation of 3 wt.% of calcium carbonate in chitosan/PVA fibers, which is enhanced from 15.7 +/- 3 MPa to 432.4 +/- 943 MPa. On the other hand, the ultimate stress of fibers experiences a decrease. This result shows that the fiber network undergoes changes from flexible to more stiff by the inclusion of calcium carbonate. The thermal analysis results show that the crystallinity of polymer is changed by the existence of calcium carbonate in the fiber network. The immersion of fibers in simulated body fluid (SBF) results in the formation of apatite on the surface of fibers.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2016-03
Language
English
Article Type
Article
Keywords

MECHANICAL-PROPERTIES; POLYMER NANOCOMPOSITES; BONE REGENERATION; NANOFIBERS; HYDROXYAPATITE; FABRICATION; NANOPARTICLES; INTERFACE; MEMBRANE; DIAMETER

Citation

MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS, v.60, pp.518 - 525

ISSN
0928-4931
DOI
10.1016/j.msec.2015.11.079
URI
http://hdl.handle.net/10203/202374
Appears in Collection
CBE-Journal Papers(저널논문)
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