Fibre change

Figure 5.8 Wavelengths of a UV absorption of chromophores in micellar fibres change periodically with even and odd numbers n of methylene groups (see textf. ...

Physical modification At polymerisation stage, dope preparation and spinning condition. Hi-bulk fibres. Hollow fibres, Change of surface structure. Extreme denier fibre. 

When water is absorbed, the dimensions of the fibres change. As the general orientation of the cellulose molecules is along the fibre, most of the expansion occurs sideways. The increase in dimensions is proportional to the water content, thus a graph of fibre diameter versus RH has the same shape as the graph in Figure 4 and hysteresis is again exhibited. 

Hoebler, C., Guillon, F., Darcy-Vrillon, B., Vaugelade, P., Lahaye, M., Worthington, E., Duee, P., and Barry, J. (2000). Supplementation of pig diet with algal fibre changes the chemical and physicochemical characteristics of digesta. /. Sd. Food Agric. 9,1357-1364. 

The resilience of preconditioned SELP-47K fibres, either autoclaved or chemical cross-linked, approached that of native elastin, which is 90% [60], It is worth noticing that mechanical properties of SELP-47K fibres change dramatically between the dry state and the full hydrated state (Table 12.3). This is likely due to the plasticizing effect of water, which gives the silk-like blocks conformational flexibility by decreasing their crystallinity. 

In agreement with the foregoing, it could be shown experimentally that the double refraction of regenerated fibres changed if their crystalline portion (consistii of the crystalline modification cellulose II) was transformed into another modification (cellulose IV) without chai ir the orientation of the fibre These effects, which impose certain restrictions as to the possibility of quantitative evaluation of orientation from optical measurements, arise from the influence of the internal field (cf. p. 586). 

Kamal Uddin, M., Abdullah, A.B.M., Rahman, M.H., 1998. A possible uses of presently available jute material as geotextiles. In International Seminar on Jute and Allied Fibres-Changing Global Scenario, Kolkata, pp. 171—177. 

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