Poly electrospun fibers

Normal transmission IRLD can also be used to characterize polymeric fibers, although scattering can induce sloping baselines. Raman spectroscopy then becomes a convenient alternative. Rutledge et al. have recently probed the orientation in electrospun nanofibers composed of a core of Bombyx mori fibroin and an outer shell of poly (ethylene oxide) [24], The orientation values were low, less than 0.1, as is often the case in electrospun fibers. 

Kenawy et al. [114] used electrospun fiber mats prepared either from PLA, poly (ethylene-co-vinyl acetate) (PEVA), or from a 50 50 blend of the two as carriers to... 

FIGURE 7.11 Electrospun fibers of poly(vinylalcohol) containing sulfonated polyaniline. 

Nanofibers based on poly(vinyl alcohol) as the matrix, and nanocrystals of a-chitin (ca. 31 nm in width and ca. 549 nm in length) as the nanofiller were prepared by Junkasem et al. [51]. The average diameters of the electrospun fibers ranged between 175 and 218 nm. The addition of increasing amounts of the whiskers caused the crystallinity of poly(vinyl alcohol) within the nanocomposite materials to decrease and the glass transition temperature to increase. 

C-C. Kuo, C-T. Wang, and W-C. Chen, Poly(3-hexylthiophene)/Poly(methyl methacrylate) core-shell electrospun fibers for sensory applications. Macromolec. Symp., 279,41-47 (2009). 

C-C. Kuo, Y-C. Tung, C-H. Lin, and W-C. Chen, Novel luminescent electrospun fibers prepared from conjugated rod-coil block copolymer of poly[2,7-(9,9-dihexylfluorene)]-block-poly(methyl methacrylate), Macromolec. Rapid Commun., 29, 1711-1715 (2008). 

Vega-Lugo, A.-C., Lim, L.T. Controlled release of allyl isothiocyanate using soy protein and poly(lactic acid) electrospun fibers. Food Res. Int. 42(8), 933-940 (2009)... 

Electrospun fibers of PVA, PLA, poly(vinyl chloride) (PVC), chitosan, and PS had their morphology strongly dependent on the... 

Two-step processes to generate nanoprotrusions on electrospun fibers have also been studied. Nanofiber "shish kebabs" by electrospinning poly(s-caprolactone) (PCL) followed by solution crystallization of PCL or a copolymer of PCL and PEO was obtained. ... 

It was later shown by MacDiarmid et al. [166] that these doped polyaniline-poly(ethylene oxide) electrospim fibers could be deposited onto an oxidized silicon wafer. They demonstrated that it was possible to measure the conductivity of individual electrospun fibers by depositing gold electrical contacts onto the wafer using a shadow mask evaporation process. It was found that the room temperature conductivity for a 1.3 pm diameter CSA-doped polyaniline-polyfethylene oxide) electrospun fiber was 33 S/cm, which is two orders of magnitude higher than the conductivity of the corresponding thermally annealed film prepared from the same solution. This result indicates that... 

One of the other ICPs that has received considerable attention for processing into electrospun fibers is poly(2-methoxy-5-(2 -ethylhexyloxy)-l,4-phenylene vinylene) (MEH-PPV) because of its ability to form concentrated solutions (>5 wt%) in organic solvents such as chloroform, 1,2-dichloroethane,... 

Arumugam, G., Khan, S., and Heiden, P. (2009) Comparison of the effects of an ionic liquid and other salts on the properties of electrospun fibers, 2-poly(vinyl alcohol). Macromol. Mater. Eng., 294, 45-53. 

K.N., Leong, K.W., Nurcombe, V., and Cool, S.M. (2006) Controlled release of heparin from poly(e-caprolactone) electrospun fibers. Biomaterials, 27, 2042-2050. 

---