Abstract
Thermodynamic behavior of a ternary system with one low molecular weight component, formic acid (FA) as the solvent, water (non-solvent), and two high molecular weight polymers [polyamide-6 (PA-6) and cellulose acetate (CA)] was investigated using an extended modified Flory-Huggins model. Where, all chemicals were purchased from Leuna Werke AG (Germany). The model was solved by MATLAB SIMULINK software manufactured in the USA. The predicted results from the model explained that the miscibility of the two blend polymers, PA-6 and CA, completed over all compositions at room temperature, and the minimum point where the miscibility of the two polymers completed was in the composition of 0.2 volume fraction of PA-6 at Gibbs free energy change on mixing (ΔGm) of -1.74015 kJ/mole. The critical temperature (Tc) for superiority properties of the polymer blend solution are in the range between the upper critical saturation temperature (UCST) 323K and the lower critical saturation temperature (LCST) 338K. The diffusion model on the solution of the immersion precipitation process in the coagulation bath indicates that the solvent volume fractions increase with time, while the polymer solution volume fraction decreases, due to solvent removal from the polymer solution and membrane formation. According to the mathematical model, it was found that the annealing temperature can affect the densification of the membrane top layer. However, the heat treatment process leads to a decrease in thickness of the membrane bottom layer, as a result of reduced and distributed membrane pores.
References
[1] Valerie GA, Mayes AM. Macromolecules 2001, 34, 1894–1907.10.1021/ma000712+Search in Google Scholar
[2] Abdallah H, Ali SS. International Review of Chemical Engineering (I.RE.CH.E.) 2012, 4, 455–465.Search in Google Scholar
[3] Randon J, Mardilovich PP, Govyadinov AN, Paterson R. J. Colloid Interf. Sci. 1995, 169, 335–341.Search in Google Scholar
[4] Barani H, Hajir Bahrami S. Macromol. Res. 2007, 15, 605–609.Search in Google Scholar
[5] Bazargan AM, Gholamvand Z, Naghavi M, Shayegh MR, Sadrnezhaad SK. Funct. Mater. Lett. 2009, 2, 113–119.Search in Google Scholar
[6] Wang XL, Qian HJ, Chen LJ, Yuan Lu Z, Sheng Li Z. J. Membr. Sci. 2008, 311, 251–258.Search in Google Scholar
[7] Wa K, Leea D, Chanb PK, Feng X. Chem. Eng. Sci. 2004, 59, 1491–1504.Search in Google Scholar
[8] Mulder MHV, Basic Principles of Membrane Technology, Kluwer Academic Publishers: Dordrecht, The Netherlands, 2000.Search in Google Scholar
[9] Altinkaya SA, Ozbas B. J. Membr. Sci.2004, 230, 71–89.Search in Google Scholar
[10] Menut P, Pochat-Bohatier C, Deratani A, Dupuy C, Guilbert S. Desalination 2002, 145, 11–16.10.1016/S0011-9164(02)00323-5Search in Google Scholar
[11] Ali SS, Abdallah H. International Review of Chemical Engineering (I.RE.CH.E.) 2012, 4, 316–323.Search in Google Scholar
[12] Miller-Chou BA, Koenig JL. Prog. Polym. Sci. 2003, 28, 1223–1270.Search in Google Scholar
[13] Yip Y, McHugh AJ. J. Membr. Sci. 2006, 271, 163–176.Search in Google Scholar
[14] Leea H, Krantzb WB, Tak Hwang S. J. Membr. Sci. 2010, 354, 74–85.Search in Google Scholar
[15] Krantza WB, Greenbergb AR, Hellman DJ. J. Membr. Sci. 2010, 354, 178–188.Search in Google Scholar
[16] Chang BH, Chan Bao Y. Chem. Eng. Sci. 2003, 58, 2931–2936.Search in Google Scholar
[17] Rawajefa A. Desalination 2005, 179, 265–272.10.1016/j.desal.2004.12.024Search in Google Scholar
[18] El-Gendi A, Ali SS, Ahmed SA, Talaat HA. Membr. Wat. Treat. 2012, 3, 185–200.Search in Google Scholar
[19] Hansen CM, Hanson Solubility Parameters: A User’sHandbook. CRC Press: Boca Raton, FL, 2000.Search in Google Scholar
[20] Bouyera D, Werapuna W, Pochat-Bohatiera C, Deratani A. J. Membr. Sci. 2010, 349, 97–112.Search in Google Scholar
[21] Khare VP, Greenberg AR, Krantz WB. J. Membr. Sci. 2005, 258, 140–156.Search in Google Scholar
[22] Hea X, Chenb C, Jiangc Z, Su Y. J. Membr. Sci. 2011, 371, 108–116.Search in Google Scholar
[23] Min J, Su M. Appl. Therm. Eng. 2010, 30, 991–997.Search in Google Scholar
[24] Velu S, Muruganandam L. J. Chem. Bio. Phy. Sci. Sec. B 2011–2012, 2, 163–171.Search in Google Scholar
[25] Ghaemi N, Madaeni SS, Alizadeh A, Daraei P, Vatanpour V, Falsafi M. Desalination 2012, 290, 99–106.10.1016/j.desal.2012.01.013Search in Google Scholar
[26] Ganesh BM, Isloor AM, Padaki M. Desalination 2010, 287, 103–108.10.1016/j.desal.2011.09.047Search in Google Scholar
[27] Gedde UW, Polymer Physics, Kluwer: Dordrecht, 1999.10.1007/978-94-011-0543-9Search in Google Scholar
[28] Lefebvre AA, Lee JH, Balsara NP, Hammouda B. J. Polym. Sci., Polym. Phys. Ed. 2000, 38, 1926–1930.Search in Google Scholar
[29] Sanchez IC, Lacombe RH. Macromolecules 1978, 11, 1145–1156.10.1021/ma60066a017Search in Google Scholar
[30] Hegde C, Isloor AM, Padaki M, Ismail AF, Lau WJ. Membr. Wat. Treat. 2012, 3, 25–34.Search in Google Scholar
[31] Rahimpour A, Madaeni SS, Amirinejad M, Mansourpanah Y, Zereshki S. J. Membr. Sci. 2009, 330, 189–204.Search in Google Scholar
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