Poly nanofiber mats

Vondran JL, Sun W, Schauer CL (2008) Crosslinked, electrospun chitosan-poly(ethylene oxide) nanofiber mats. J Appl Polym Sci 109(2) 968-975... 

Poly(3,4-ethylenediox5d hiophene3 (PEDOT) nanoiiber mats by electrospinning combined with in situ interfacial pol3mierization (Fig 5.11], The PEDOT nanofiber mats displayed good mechanical properties (tensile strength 8.7 0.4 MPa Young s modulus 28.4 ... 

Two types of poly electrolyte nanofiber mats were prepared in this study. One was polyacrylic acid (Mv = 450,000) fibers, spun from 5 wt% of aqueous solution. The other one was polysulfone fibers, spun from 25 wt% of DMF solution. The polysulfone fiber was then coated with a layer of polyelectrolyte, FAMPS, by a surface grafting technique (FAMFS-g-FS) similar to the procedure described previously. Nucrel membranes wereprepared by heat pressing Nucrel 535 (DuPont) pellets at 125°C. For fiber encapsulation, the fiber mats with measured weight and thickness were placed between two preweighed Nucrel membranes and then pressed at 125°C. The resulting composite membranes were flexible and robust with a homogeneous transparency. 

Ignatova M, Starbova K, Markova N, Manolova N, Rashkov 1 (2006) Electrospun nanofiber mats with antibacterial properties from quatemised chitosan and poly(vinyl alcohol). Carbohydr Res 341 2098-2107... 

FIGURE 1.12 Poly[bis(trifluoroethoxy)phosphazene] surfaces. Top left a solvent cast film. Top right solvent-electrospun 80 nm nanofibers. Bottom left water droplet on film surface with advancing contact angle of 104°. Bottom right water droplet on nanofiber mat with advancing contact angle of 155°. 

Figure 5.6 (a) SEM image of an electrospun nanofiber mat of poly(s-caprolactone). b) Frequency distribution of fiber diameter estimated from the image using image anaiysis software. (Courtesy of Research Triangle Institute, 2004.)... 

MMT is a reinforcing filler in polymers such as poly(urea urethane) (Ge et al. 2000) as evidenced by the very significant increase in mechanical properties of the composite nanofibers. Unfilled polymer nanofiber mats of polyurethane (PU) (M — 150,000 g/mol) were electrospun from llwt% solution in DMAc/THF (7 3wt/wt) into nanofibers with 150nm to 410nm. The tensile properties of these mats are shown in Table 6.4, where the last digit in the nanofiber designation is the weight fraction of MMT in the polymer. Based on the WAXD patterns for the composite nanofibers, MMT appeared to be well dispersed, exfoliated, and oriented in the axial direction of the samples. 

Poly(L-glycolide) (PLGA) nanofiber mats of random copolymers of lactide (L) and glycolide (G) have mechanical properties that are in the same range as those of the tissue they are intended to replace (Li et al. 2002 Luu et al. 2003 Shin, H. J., et al. 2006). The tensile modulus (MPa)... 

Figure 7.9 Nanofiber mat of poly( -caprolactone) (PCL) prior to seeding with cells, demonstrating the high degree of porosity. Average fiber diameter d = 400 200 nm. Reproduced with pennission from Yoshimoto et al. (2003). Copyright 2003. Elsevier.

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