期刊
EUROPEAN POLYMER JOURNAL
卷 49, 期 10, 页码 3210-3222出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2013.06.024
关键词
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate); Fibers; Electrospinning; Microstructure; Thermal properties; Mechanical properties
资金
- INSTM-PRISMA project Studio dell'orientamento e dei fenomeni di segregazione indotti in matrici polimeriche ibride ed in miscele polimeriche elettrofilate
Microstructure, surface topography, thermal and mechanical features of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) electrospun non-woven mats were modified, modulated and tailored through blending with different polyethylene oxide (PEO) amounts (20, 30 and 50% wt/wt). The optimal parameters of the soaking protocol for the selective removal of the sacrificial polymer were accurately identified by means of scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), Fourier transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy, simultaneous thermogravimetric and differential analyses (TG-DTA) and differential scanning calorimetry (DSC). The complete PEO removal after soaking in H2O for 7 days with daily refreshment was confirmed. The resulting samples were only comprised of PHBV fibers characterized by a remarkable decrease of the average size with respect to the respective blends. Their surface topography was corrugated and rough and presented nodules, pits, nanopores, shallow and elongated nanostructured indents/grooves along the fiber axis. A remarkable reduction (>75%) of the tensile modulus (E) of electrospun PHBV mats (15-20 MPa) was obtained, maintaining comparable elongation at break (epsilon(max)) values (20-30%). (C) 2013 Elsevier Ltd. All rights reserved.
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