Orientation and interfacial stress transfer of cellulose nanocrystal nanocomposite fibers

Publication date: 10 February 2017
Source:Polymer, Volume 110
Author(s): Huibin Chang, Jeffrey Luo, H. Clive Liu, Amir A. Bakhtiary Davijani, Po-Hsiang Wang, Satish Kumar
Orientation and interfacial stress transfer in cellulose nanocrystals (CNC) reinforced polyacrylonitrile (PAN) nanocomposite fibers were determined by Raman spectroscopy. The 1095 cm⁻¹ Raman band was used to quantify the orientation of CNC in composite fiber. Under VV (vertical/vertical) mode, polar plots of all composite fibers showed a two-fold symmetry. Under VH (vertical/horizontal) mode, it showed a four-fold symmetry. The CNCs are highly oriented in the composite fiber, which is confirmed by second and fourth order orientation parameters:〈P2(cosθ)〉 and〈P4(cosθ)〉. The 1095 cm⁻¹ Raman band shift under uniaxial deformation was used to characterize the interfacial shear stress transfer between PAN matrix and CNCs.

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