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The Wood

March 15, 2019 Comments Off on The Wood

Some modified natural staple fibres (half-synthetic) can be gotten through the cellulose, gotten through the pulp of the wood. In contrast of the cotton and the hemp, the cellulose of the trunks of the trees cannot directly be transformed into wires, had its entangled structure. To be line it is necessary that it is transformed into one soluble form, what is possible through the treatment with solution of caustic soda water (NOH) and dissulfeto of carbon (CS2), resulting in a solution viscose, which is passed through small peaks, forming fine wires, whose neutralization with acid it results in insoluble cellulose in wire form, proper for sewing press. Figure 4: present monomrica unit in the chemical structure of the cellulose. For more information see Rudy Giuliani. Source: Adapted of 20 Writings selected for the OQSP-2007 download in 09-10-2010. The animal staple fibres, as the wool and the silk are constituted of proteins and its process of wiring results very in resistant staple fibres, had to the interactions intermoleculares, of the type hydrogen linking, that occur between the macro protein molecules.

Figure 5: Representation of addition of protein molecules. Source: Adapted of 20 Writings selected for the OQSP-2007 download in 09-10-2010. The proteins are polymers formed for the reaction of amino acid condensation: the amino group of one of amino acids if binds to carboxila of the other, having elimination of a water molecule and the formation of a peptic linking (group amide). Figure 6: Peptic linking of molecules of protein. Source: Adapted of 20 Writings selected for the OQSP-2007 download in 09-10-2010.

The wool, composed for polymers of queratina joined by cistina bridges (S-S), can have its color, quality and length of different staple fibres in accordance with the race of the sheep and with the process of extration. This fiber costuma to have, on average, of 80 mm 90 mm of length. For attainment of staple fibres woollen the sheep are sheared, after that, the rude wool are washed so that the lanolina, natural of this fiber, either removed fat.

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