Abstract
Cellulose flat and tubular films were made from cellulose-aqueous N-methylmorpholine N-oxide solution system by casting method on nonwovens and blow-extrusion technique, respectively. An attempt was made to disclose the chain orientation of the new cellulose films. It was found that the (110) lattice planes of the flat and tubular films have an uniplanar orientation mode with respect to the film surface. For flat films, the (110) lattice planes are almost unoriented with respect to the machine direction. However, the (110) planes of tubular films have axial orientation with respect to the machine direction. With increasing blow up ratio, both the axial orientation and the crystallinity of tubular films increase. With increasing draw down ratio, only the axial orientation increases while the crystallinity does not change significantly. The three dimensional orientation parameters from polarized Fourier transform infrared spectrometry (FT-IR) spectra by sample tilting indicate that the uniplanar orientation of cellulose chain with respect to the surface of flat film increases when the casting speed increases. Moreover, no axial orientation was found within the plane parallel to the flat film surface. For tubular films, the uniplanar orientation with respect to the film surface increases with the blow up or draw down ratio.
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Zhang, Y., Shao, H. & Hu, X. The Chain Orientation of Cellulose Flat and Tubular Films Prepared from N-Methylmorpholine N-Oxide Solutions. Polym J 34, 666–673 (2002). https://doi.org/10.1295/polymj.34.666
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DOI: https://doi.org/10.1295/polymj.34.666
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