Electrospun blend ratio

Figure 8.2 Correlation of solution viscosity and morphological structures of electrospun PLA/HMW PCL (blend ratio 1/1) fibers using chloroform/methanol [60]. The scale bars in SEM micrographs represent 10 pm.

In the present work, we used polyaniline (PANI)/polyacrylonitrile (PAN) blend to form a nonwoven mat. The PANI exists in a large number of intrinsic redox states. The half oxidized emeraldine base is the most stable and widely investigated state in the PANI family that can be dissolved in N-methyl-2 pyrohdon (NMP). The polyaniline emeraldine base (PANIEB)/polyacrilonitrile blend solution in NMP was prepared and then it was electrospun with different blending ratio. The fibers diameter, fibers morphology, and electrical conductivity of the mats were analyzed and discussed. 

Figure 4.2 SEM micrographs of electrospun PLA 15% LMW PCL fibers using chloroform methanol cosolvents with different PLA PCL blend ratios (a) 1 0, (b) 3 1, and (c) 1 1 with 1 wt%/v HNTs, and (d) 1 0 with 2 wt%/v HNTs, (e) 3 1 with 2 wt%/v HNTs, and (f) 1 1 with 2wt%/v HNTs. All scale bars represent 10 pm.

Desai, K. Kit, K. (2008). Effect of spurning temperature and blend ratios on electrospun chitosan/poly(acrylamide) blends fibers. Polymer, 49(19), 4046-4050. 

Figure 8.13 SEM images of electrospun rapamycin-PU fibers at a relative RM/SPU ratio (w/w) of 0,1, 5, 10, or 20% via three different blending methods. Scale bar 2 pm. Adapted from Ref. [101].

Another modified spinneret was designed with multiple single jets in order to enhance nanofibers spinning rate of PEO (Theron et al. 2005) or to prepare nanofibrous mats composed of two different and immiscible polymers such as PVA and cellulose acetate. A multiple jet composed of four tips was used in order to blend PVA and cellulose acetate nanofibers in different ratios (Pham et al. 2006). In another study, a collector moving transversely was used in front of a multiple jet composed of two tips in order to produce a mixture of electrospun PEO and polyurethane (PU) nanofibers and a uniform distribution of this mixture was achieved due to the motion of the collector (Kidoaki et al. 2005). 

Figure 20.12 FTIR data of electrospun PVA/AIg blend nanofibers with volume ratios of 10wt% of PVA to 2 wt% of Alg solutions of (a) 100/0, (b) 80/20 and (c) bulk alginate. Reprinted with permission from Ref [81] 2010, Elsevier.

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