Comparative study of PVA/SiO2 and PVA/SiO2/glutaraldehyde (GA) nanocomposite membranes prepared by single-step solution casting method
- 792 Downloads
We prepared poly(vinyl alcohol) (PVA)/SiO2 and PVA/SiO2/glutaraldehyde (GA) nanocomposite membranes in a single step using the solution casting method. The structure, morphology, and properties of these nanocomposite membranes were characterized by Raman spectroscopy, atomic force microscopy, small- and wide-angle X-ray scattering, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis (DMA). The influence of silica and GA loading on the meso-scale characteristics of the composite membranes was investigated. The results showed that silica deposited in the form of small nanoparticles (~1 nm) in the PVA/SiO2 membranes, while bigger submicron particles (>25 nm) were formed in the PVA/SiO2/GA membranes. The water uptake of the PVA/SiO2 membranes increased with temperature, but the PVA/SiO2/GA membranes were completely dissolved above 50 °C. We can therefore conclude that the addition of GA deteriorated the properties of PVA/SiO2 membranes. The thermal stability of the PVA/SiO2 membranes increased with the increasing silica loading with a maximum char yield of 46 % for PVA/SiO2/4T. Even DMA profiles indicated a promising increase in E R (rubbery modulus) from 6 MPa (PVA membrane) to 1015 MPa (PVA/SiO2/4T) at 250 °C, showing high mechanical strength of these membranes.
KeywordsDynamic Mechanical Analysis Composite Membrane Nanocomposite Membrane Solution Casting Method Differential Scanning Calorimetry Profile
The result was developed within the CENTEM project, reg. no. CZ.1.05/2.1.00/03.0088, cofunded by the ERDF as part of the Ministry of Education, Youth and Sports OP RDI programme and, in the follow-up sustainability stage, supported through CENTEM PLUS (LO1402) by financial means from the Ministry of Education, Youth and Sports under the National Sustainability Programme I. Financial support from specific university research (MSMT No 21/2015) is acknowledged. The authors would like to thank to Jan Beneš for careful technical assistance with the measurement of Raman spectra.
- 18.M’barki O, Hanafia A, Bouyer D, Faur C, Sescousse R, Delabre U, Blot C, Guenoun P, Deratani A, Quemener D, Pochat-Bohatier C (2014) Greener method to prepare porous polymer membranes by combining thermally induced phase separation and crosslinking of poly(vinyl alcohol) in water. J Membr Sci 458:225–235CrossRefGoogle Scholar
- 36.Guirguis W, Moselhey MTH (2012) Thermal and structural studies of poly(vinyl alcohol) and hydroxypropyl cellulose blends. Nat Sci 4:57–67Google Scholar
- 42.Gilman JW, Hart DLV, Kashiwagi T (1994) In: Nelson GL (ed) Fire and polymers II: materials and tests for hazard prevention. American Chemical Society, Washington, DC, p 161Google Scholar