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Title
Double-diffusion behavior between phosphoric acid complex solvent and organic coagulant and their incorporation into cellulose film
Authors
RUI XIONG FAXUE LI and JIANYONG YU
Received
August 28, 2012
Published
Volume 47 Issue 7-8 July-August
Keywords
double-diffusion behavior, phosphoric acid complex solvent (PACS), cellulose film, coagulation,
morphology, wettability, tensile strength
Abstract
The double-diffusion behavior between phosphoric acid complex solvent (PACS) and organic coagulant was evaluated.
In addition, the properties and micro-structure of cellulose films regenerated in PACS and organic coagulants were
investigated by scanning electron microscope (SEM), water contact angle (WCA), tensile test, X-ray diffraction
(XRD), and fourier transform infrared spectroscopy (FTIR). SEM images demonstrated that the film prepared in
ethanol/methanol exhibited a mostly non-uniform morphology mainly resulting from the highest double-diffusion rate
during coagulation. The best hydrophobicity of the film prepared in ethanol/glycol, as determined by WCA
measurements, was also better explained by the corresponding lowest double-diffusion rate. The cellulose solution
seemed favored by ethanol/acetone to be processed into film with satisfactory mechanical properties and crystallinity,
which was probably attributed to the neither too fast nor too slow double-diffusion rate. FTIR analysis confirmed that
no drastic change occurred in the micro-structure of cellulose films irrespective of the coagulation bath.
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