Tensile deformation of regenerated and native cellulose fibres

Abstract

The tensile deformation of well-oriented cellulose fibres has been reexamined. It is demonstrated that not only the fibre structure but also the deformation mechanism is similar to that found in high performance aramid fibres. An explanation is proposed for the difference between the elastic moduli of cellulose I and 11. In view of these results it is possible to assess the prospect for improving the mechanical properties of cellulose fibres. ZUSAMMENFASSUNG:Die Zugverformung von gut orientierten Cellulosefasern wurde erneut iiberpriift .Es wird gezeigt, dal3 nicht nur die Faserstruktur, sondern auch der Verformungsmechanismus tlhnlich denen sind, die in Hochleistungs-Aramidfasern gefunden werden.Eine Erkl&ung fiir den Unterschied zwischen den Elastizitatsmoduli von Cellulose I und Cellulose I1 wird vorgeschlagen. Im Hinblick auf diese Ergebnisse ist es moglich, die Aussichten fiir die Verbesserung der mechanischen Eigenschaften von Cellulosefasern abzuschatzen.

The tensile and compressive deformation of polymer and carbon fibers

“…(8), form the constitutive equations for the viscoelastic deformation of the fiber. 16 Because the tensile behavior of other technical yarns such as PET and cellulose is similar to the tensile behavior of PpPTA yarns, 14,15 it is expected that also the creep and more complex loadings of these fibers can be described by the proposed theory.…”

“…11,14,15,48 A typical example of the strain and the sonic compliance during the creep of a Twaron 1000 PpPTA fiber is shown in Figure 17(a,b). For this fiber, the logarithmic creep law (t) ϭ 0 ϩ C log(t) has been frequently confirmed by experiments.…”

“…12,13 For fibers below the glass transition temperature, it has been shown that the chain orientation function is the dominant structural parameter. 8,10,14,15 The continuous model demonstrates that, for the understanding of the main features of the tensile behavior of fibers, it is not necessary to consider the various kinds of structural details, except for the orientation distribution. The continuous chain model has been derived for finite strains up to about 0.05-0.1 and for fibers with an arbitrary orientation distribution of the polymer chains.…”

Cellulose Swelling by Aprotic and Protic Solvents: What are the Similarities and Differences?

“…As shown elsewhere, [46][47][48] a consequence of the different conformations of the hydroxy- methyl groups is that cellulose I has an additional intramolecular hydrogen bond along the chain axis that does not exist in cellulose II. [49][50] That is, the solvent has to compete (for the OH groups of cellulose) with less intramolecular hydrogen bonds in the case of M-cellulose, than in the case of its native precursor. This contributes to the observed order of swelling.…”

Crystal structure and elastic constants of Dharwar cotton fibre using WAXS data

“…A comparison of this model has been carried out by Eichhorn and Davies (2006). Northolt and Vries (1985) reexamined tensile deformation of welloriented cellulose fibres and the results show the prospect for improving the mechanical properties of cellulose fibres. Here, by using two different sets of hydrogen bond force constants of 24⋅6 and 31⋅9 × 10 10 N/m 2 , the Young's modulus has been estimated along the chain direction (Gillis 1969).…”