Effects of polymer concentration and coagulation temperature on the properties of regenerated cellulose films prepared from LiOH/urea solution
- 814 Downloads
Aqueous 5 wt% LiOH/12 wt% urea solution pre-cooled to −12 °C has a more powerful ability to dissolve cellulose compared to that of NaOH/urea and NaOH/thiourea solution system. The influences of the cellulose concentration and coagulation temperature on the structure, pore size and mechanical properties of the cellulose films prepared from LiOH/urea system were investigated. The cellulose films exhibited good mechanical properties either at wet or dry state and their pore size and water permeability at wet state can be controlled by changing the cellulose concentration or coagulation temperature. With a decrease of the coagulation temperature, the mechanical properties and optical transmittance of the cellulose films enhanced, as a result of the formation of relative smaller pore size and denser structures. This work provided a promising way to prepare cellulose films with different pore sizes at wet state and good physical properties at dry state.
KeywordsCellulose Film Permeability LiOH/urea Mechanical properties
This work was supported by National Support Project for Science and Technology (2006BAF02A09), as well as by major grant of the National Natural Science Foundation of China (59933070 and 30530850), the National Natural Science Foundation of China (20874079).
- Liu S, Zhang L, Zhou J, Wu R (2008) Structure and properties of cellulose/Fe2O3 nanocomposite fibers spun via an effective pathway. J Phys Chem C 112:1538–4544Google Scholar
- Mulder M (1992) Basic principles of film technology. Kluwer, DordrechtGoogle Scholar
- Rabek JF (1980) Experimental methods in polymer chemistry: applications of wide-angle X-ray diffraction (WAXD) to the study of the structure of polymers. Wiley Interscience, Chichester, p 507Google Scholar
- Sang YO, Dong IY, Younsook S, Hwan CK, Hak YK, Yong SC, Won HP, Ji HY (2005) Crystalline structure analysis of cellulose treated with sodium hydroxide and carbon dioxide by means of X-ray diffraction and FTIR spectroscopy. Carbohydr Res 340:2376–2391. doi: 10.1016/j.carres.2005.08.007 CrossRefGoogle Scholar
- Togawa E, Kondo T (1999) Change of morphological properties in drawing water-swollen cellulose films prepared from organic solutions: a view of molecular orientation in the drawing process. J Polym Sci Polym Phys 37:451–459. doi:10.1002/(SICI)1099-0488(19990301)37:5<451::AID-POLB5>3.0.CO;2-7CrossRefGoogle Scholar
- Yoshihiko A, Akira M (2003) Hemodialysis film prepared from cellulose/N-methylmorpholine-N-oxide solution. II. Comparative studies on the permeation characteristics of films prepared from N-methylmorpholine-N-oxide and cuprammonium solutions. J Appl Polym Sci 89:333–339. doi: 10.1002/app.12088 CrossRefGoogle Scholar