in Figures 5(a) and (c). The fiber diameters (Figure 5(a),
lower inset) show an almost Gaussian distribution exclusively
placed in the nanometer range (100-700 nm), values about
two times lowers than those obtained for G30%.
As opposed to PU, the PVC fibers are straight and forms
matrices with characteristics comparable with those made of
gelatin, despite the use of a low vapor pressure solvent
mixture. The PVC fiber diameters (Figure 5(b), lower inset)
present a somewhat tighten distribution than that of G30%,
but cover the same range. However, the fiber surfaces tend
to be sometimes lightly non-uniform and sparse coalescence
of superposed fibers occurs, suggesting that PVC working
solution is close to the upper limit of optimum concentration.
In order to furthermore investigate the effect of polydispersity
on the quality of resulting polymer matrices, a solution of
G30% was mixed with compounds having much higher Mw
(chitosan) and respective lower Mw (PEG), the later additive
having also a compatibilizer role. The resulting blend was
spun in the same conditions as gelatin, except the rotational
speed that was gentle increased to 3500 rpm in an attempt to
increase the homogeneity and reduce the fiber diameters. As