Cellulose Nanofiber Orientation in Nanopaper and Nanocomposites by Cold Drawing

QC 20120411
To exploit the mechanical potential of native cellulose fibrils, we report on the preparation of nanopaper with preferred orientation of nanofibrillated cellulose (TEMPO-NFC) by cold drawing. The preparation route is papermaking-like and includes vacuum filtering of a TEMPO-oxidated NFC water dispersion, drawing in wet state and drying. The orientation of the fibrils in the nanopaper was assessed by AFM and wide-angle Xray diffraction analysis, and the effect on mechanical properties of the resulting nanopaper structure was investigated by tensile tests. At high. draw ratio, the degree of orientation is as high as 82 and 89% in and cross-sectional planes of the nanopaper, respectively, and the Young's modulus is 33 GPa. This is much higher than mechanical properties of isotropic nanopaper. The cold drawing method can be also applied to NFC nanocomposites as demonstrated, by preparation of TEMPO-NFC/hydroxyethyl cellulose (HEC) nanocomposites. The introduction of the soft HEC matrix allows further tailoring of the mechanical properties.

Mushi, Ngesa EzekielKTH,Fiber- och polymerteknologi(Swepub:kth)u1zbv70g (author)
Morimune, SeiraKTH,Wallenberg Wood Science Center(Swepub:kth)u14tnom4 (author)
Salajkova, MichaelaKTH,Wallenberg Wood Science Center(Swepub:kth)u1li8aph (author)
Nishino, Takashi (author)
Berglund, Lars A.KTH,Fiber- och polymerteknologi,Wallenberg Wood Science Center(Swepub:kth)u1wqz3r1 (author)
KTHFiber- och polymerteknologi (creator_code:org_t)

In:ACS Applied Materials and Interfaces: American Chemical Society (ACS)4:2, s. 1043-10491944-82441944-8252

By the author/editor: Sehaqui, Houssin ...; Mushi, Ngesa Eze ...; Morimune, Seira; Salajkova, Micha ...; Nishino, Takashi; Berglund, Lars A ...

About the subject

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.