Morphology and properties of cellulose/chitin blends membranes from NaOH/thiourea aqueous solution
- 11 September 2002
- journal article
- Published by Wiley in Journal of Applied Polymer Science
- Vol. 86 (8), 2025-2032
- https://doi.org/10.1002/app.11156
Abstract
Blend membranes of chitin/cellulose from 12 : 50 to 12 : 250 were successfully prepared from cotton linters in 1.5M NaOH/0.65M thirourea solution system. Two coagulation systems were used to compare with each other, one coagulating by 5 wt % H2SO4 (system H), and the other by 5 wt % CaCl2 and then 5 wt % H2SO4 (system C). The morphology, crystallinity, thermal stabilities, and mechanical properties of the blend membranes were investigated by electron scanning microscopy, atomic absorption spectrophotometer, infrared spectroscope, elemental analysis, X‐ray diffraction, different scanning calorimeter, and tensile tests. The cellulose/chitin blends exhibited a certain level of miscibility in the weight ratios tested. There were great differences between the two blends H coagulated with H2SO4 and C coagulated with CaCl2 and H2SO4, respectively. The membranes H have a denser structure, higher thermal stability, tensile strength (σb), and crystallinity (χc), and values of σb (90 MPa for chitin/cellulose 12 : 150) were significantly superior to that of both chitin and regenerated cellulose membrane. However, the blend membranes C have much better breaking elongations (ϵ) than that of membranes H, and relatively large pore size (2re = 210 μm), owing to the removal of a water‐soluble calcium complex of chitin as pore former from the membranes C. When the percentage content of chitin in the blends was from 5 to 7.5%, the values of breaking elongation for the blend membranes H and C all were higher than that of unblend membranes, respectively. The blends provide a promising way for application of chitin as a functional film or fiber in wet and dry states without derivates. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2025–2032, 2002Keywords
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