Abstract
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.
Similar content being viewed by others
References
Cai J, Zhang L (2005) Rapid dissolution of cellulose in LiOH/urea and NaOH/urea aqueous solution. Macromol Biosci 5:539–548. doi:10.1002/mabi.200400222
Cai J, Zhang L (2006) Unique gelation behavior of cellulose in NaOH/urea aqueous solution. Biomacromolecules 7:183–189. doi:10.1021/bm0505585
Cai J, Liu Y, Zhang L (2006) Dilute solution properties of cellulose in LiOH/urea aqueous system. J Polym Sci Part B Polym Phys 44:3093–3101. doi:10.1002/polb.20938
Cai J, Zhang L, Zhou J, Qi H, Chen H, Kondo T, Chen X, Chu B (2007) Multifilament fibers based on dissolution of cellulose in NaOH/Urea aqueous solution: structure and properties. Adv Mater 19:821–825. doi:10.1002/adma.200601521
Clasen C, Sultanova B, Wilhelms T, Heisig P, Kulicke WM (2006) Effects of different drying processes on the material properties of bacterial cellulose films. Macromol Symp 244:48–58. doi:10.1002/masy.200651204
Fink HP, Weigei P, Purz HJ, Ganster J (2001) Structure formation of regenerated cellulose materials from NMMO solutions. Prog Polym Sci 26:1473–1524. doi:10.1016/S0079-6700(01)00025-9
Inamoto M, Miyamamoto I, Hongo T, Iwada M, Okajima K (1996) Morphological formation of the regenerated cellulose films recovered from its cuprammonium solution using various coagulants. Polym J 28:507–512. doi:10.1295/polymj.28.507
Isogai A, Usuda M, Kato T, Uryu T, Atalla RH (1989) Macromolecules 22:3168–3172. doi:10.1021/ma00197a045
Kamide K, Iijima H, Matsuda S (1993) Thermodynamics of formation of porous polymeric film by phase separation method I: nucleation and growth of nuclei. Polym J 25:1113–1131. doi:10.1295/polymj.25.1113
Kim J, Yun S (2006) Discovery of cellulose as a smart material. Macromolecules 39:4202–4206. doi:10.1021/ma060261e
Liu S, Zhou J, Zhang L, Guan J, Wang J (2006) Synthesis and alignment of iron oxide nanoparticles in a regenerated cellulose film. Macromol Rapid Commun 27:2084–2089. doi:10.1002/marc.200600543
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 112:1538–4544
Mulder M (1992) Basic principles of film technology. Kluwer, Dordrecht
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 507
Rogers RD, Turner MB, Spear SK, Holbrey JD (2004) Production of bioactive cellulose films reconstituted from ionic liquids. Biomacromolecules 5:1379–1384. doi:10.1021/bm049748q
Rosenau T, Potthast A, Sixta H, Kosma P (2001) The chemistry of side reactions and byproduct formation in the system NMMO/cellulose (Lyocell process). Prog Polym Sci 26:1763–1837. doi:10.1016/S0079-6700(01)00023-5
Rosenau T, Hofinger A, Potthast A, Kosma P (2003) On the conformation of the cellulose solvent N-methylmorpholine-N-oxide (NMMO) in solution. Polymer (Guildford) 44:6153–6158. doi:10.1016/S0032-3861(03)00663-3
Ruan D, Zhang L, Zhang Z, Xia X (2004a) Structure and properties of regenerated cellulose/tourmaline nanocrystal composite films. J Polym Sci Polym Phys 42:367–373. doi:10.1002/polb.10664
Ruan D, Zhang L, Mao Y, Zeng M, Li X (2004b) Microporous films prepared from cellulose in NaOH/thiourea aqueous solution. J Membr Sci 241:265–274. doi:10.1016/j.memsci.2004.05.019
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
Simon J, Muller HP, Koch R, Muller V (1998) Thermoplastic and biodegradable polymers of cellulose. Polym Degrad Stabil 59:107–115. doi:10.1016/S0141-3910(97)00151-1
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;2-7
Van de Witte PVD, Dijkstra PJ, Van de Berg JWA, Feijen J (1996) Phase separation process in polymer solutions in relation to membrane formation. J Membr Sci 117:1–31. doi:10.1016/0376-7388(96)00088-9
Yang G, Zhang L (1996) Regenerated cellulose microporous films by mixing cellulose cuoxam with a water soluble polymer. J Membr Sci 114:149–155. doi:10.1016/0376-7388(95)00314-2
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
Zhou J, Zhang L, Cai J, Shu H (2002) Cellulose microporous films prepared from NaOH/urea aqueous solution. J Membr Sci 210:77–90. doi:10.1016/S0376-7388(02)00377-0
Acknowledgments
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).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Liu, S., Zhang, L. Effects of polymer concentration and coagulation temperature on the properties of regenerated cellulose films prepared from LiOH/urea solution. Cellulose 16, 189–198 (2009). https://doi.org/10.1007/s10570-008-9268-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10570-008-9268-7