Poly tubes fabrication

The apparatus consists of a simple vacuum manifold similar to that shown in Fig. 4. The vacuum manifold should be fabricated from nickel or Monel metal, with silver-soldered or Swagelok connections. Valves should be of Monel metal, and the traps and scrubber, the function of which is to remove hydrogen fluoride vapor from the C103 F product, may be constructed conveniently of poly(chlorotrifluoroethylene) (Kel-F) tubing. A nickel cylinder of 500-ml. or 1-1. capacity serves as a reaction vessel, and a 500-ml. Monel bulb or similar vessel may be used as a product receiver. The scrubber (about 1-in. o.d.) is charged with pellets of sodium fluoride prepared in a separate operation by heating sodium... 

Dong and Jones Jr. reported on the preparation of submicron electrically conductive polypyrrole/poly(methyl methacrylate) coaxial fibers and conversion to polypyrrole tubes and carbon tubes [47]. In this study, PMMA fibers with an average diameter of 230 nm were initially fabricated by electrospinning as core materials. The PMMA fibers were subsequently coated as templates with a thin layer of PPy by in situ deposition of the conducting polymer from aqueous solution. Hollow PPy nanotubes were produced by dissolution of the PMMA core from PPy/PMMA coaxial fibers. Furthermore, high temperature (1000 °C) treatment under an inert atmosphere can be used to convert PPy/PMMA coaxial fibers into carbon tubes by complete decomposition of the PMMA fiber core and carbonization of the PPy wall (Figure 4.13). 

There are several non-biorelated examples of application of self-folding polymer Aims. Deposition of patterned metal on the polymer bilayer allowed fabrication of self-roiled tubes with patterned conductive inner wall [24c]. In another example, pyrolysis of polystyrene-poly(4-vinyl pyridine)-polydimethylsiloxane trilayer [29] were used for fabrication of silica tubes. Gracias used self-folding polymers films were used to fabricate self-assembled curved microfluidic networks (Fig. 1.7f) [39]. 

Shaffer MSP and Windle A H (1999) Fabrication and characterization of carbon nano-tube/poly(vinyl alcohol) composites, Adv Mater 11 937-941. 

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