Effects of Nanoclay on Cellular Morphology and Water Absorption Capacity of Poly(vinyl alcohol) Foam

Document Type : Research Article

Authors

Department of Polymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN

Abstract

The present work was aimed to examine the effects of incorporation of each of two different types of nanoclay, i.e. Cloisite Na+ and Cloisite 30B, into PVA foam on cellular morphology and water absorption capacity. Foam samples containing 0.0-10.0 wt% of each of the two types of nanoclay alone were prepared using mechanical foaming. Accordingly, PVA/organoclay/water suspensions were prepared first. Then other agents, i.e. catalyst, surfactant and crosslinking agent were added, respectively, to each of the prepared suspensions rendering primary froths, which were converted to final foam samples at room temperature during a period of 24 h. State of clay dispersion in the polymer matrix and cellular morphology of the prepared foam samples were examined using X-Ray Diffraction (XRD) technique and Field Emission Scanning Electron Microscopy (FESEM), respectively. Also, dry foam density and water absorption of the foam samples were measured gravimetrically. XRD patterns revealed the existence of intercalated and exfoliated structures in the PVA/Cloisite 30B and the PVA/Cloisite Na+ foam samples, respectively. FESEM images demonstrated open-cell morphology for all the samples but the extent of cell wall rupture was more significant in the case of PVA/nanoclay foam samples. In addition, water absorption capacity of the PVA foam was shown to be decreased by the incorporation of either of the two types of nanoclay, which was explained in terms of the lower total pore volume in the PVA/nanoclay foam samples than in the neat PVA foam sample. Finally, the obtained results were explained in terms of the effects of the nanoparticles on the elevation of the rate of the drainage in the crosslinking PVA solution before the stabilization of the cellular structure.

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References

[1] Khosrowshahi S.M., Abbasi F., Harasi N., Maher B.M., Relationships Between Synthesis Parameters and Properties of Water Expandable Polystyrene, J. Cell. Plast., 49(1): 13-31 (2013).
[2] Liu P.S., Chen G.F., "Porous Materials Processing and Applications", Elsevier, Butterworth-Heinemann (2014).
[3] Mittal V., "Polymer Nanocomposite Foams", CRC Press, Boca Raton (2013).
[4] Lee S.T., Scholz D.P.K., "Polymeric Foams: Technology and Developments in Regulation Process", CRC Press, Boca Raton (2008).
[5] Hu X., Wouterson E.M., Liu M., "Handbook of Manufacturing Engineering and Technology", Springer, London (2014).
[6] Lobos J., Velankar S., How Much do Nanoparticle Fillers Improve the Modulus and Strength of Polymer Foams?, J. Cell. Plast., 52(1): 57-88 (2016).
[7] Mikos A.G., Temenoff J.S., Formation of Highly Porous Biodegradable Scaffolds for Tissue Engineering, Electronic Journal of Biotechnology, 3: 2 (2000).
[8] Rosenblatt S., Injection molded PVA Sponge, U.S. Pat. US5554659 (1996).
[9] Chen G., Yang X., Polyvinyl Acetate Sponge and Method for Producing Same, U.S. Pat. US20030046783 (2003).
[10] Baia X., Ye, Z.F., Lia Y.F., Zhou L.C., Yang L.Q., Preparation of Crosslinked Macroporous PVA Foam Carrier for Immobilization of Microorganisms, Process Biochem., 45(1): 60-66 (2010).
[11] John, D.B., Lemley T.J., Petrochko C.N., Polyvinyl Alcohol Foam Particle Sizes and Concentrations Injectable Through Microcatheters, J. Vasc. Interv. Radiol., 9(1): 113-118 (1998).
[12] Faghihian H., Rasekh M., Removal of Chromate from Aqueous Solution by a Novel Clinoptilolite-Polyanillin Composite, Iran. J. Chem. Chem. Eng. (IJCCE), 33(1): 45–51 (2014).
[13] Shamsipur M., Bahrami-Adeh N., Hajitarverdi M.S., Yazdimamaghani M., Zarei F., Influence of Micro and Nano Silica on Mechanical Properties of Plasticized Sulfur Composites, Iran. J. Chem. Chem. Eng. (IJCCE), 32(3): 1-7 (2013).
[14] Jahanmardi R., Kangarlou B., Ranjbarzadeh-Dibazar A., Effects of Organically Modified Nanoclay on Cellular Morphology, Tensile Properties, and Dimensional Stability of Flexible Polyurethane Foams, J. Nanostruct. Chem., 3:82 (2013).
[15] Lee L.J., Zeng C., Cao X., Han X., Shen J., Xu G., Polymer Nanocomposite Foams, Compos. Sci. Technol., 65(15-16): 2344-2363 (2005).
[16] Arab-Baraghi M., Mohammadizadeh M., Jahanmardi R., A simple method for Preparation of Polymer Microcellular Foams by In-Situ Generation of Supercritical Carbon Dioxide From Dry Ice, Iran. Polym. J., 23(6): 427-435 (2014).
[17] Ahmadi M., Jahanmardi R., Mohammadizadeh M., Preparation of PMMA/MWNTs Nanocomposite Microcellular Foams by In-situ Generation of Supercritical Carbon Dioxide, Iran. J. Chem. Chem. Eng. (IJCCE), 35(2): 63-72 (2016).
[18] Alveraz P., Mendizabal A., Petite M., Rodriguez-Perez M.A., Echeverria A., Finite Element Modeling of Compressive Mechanical Behaviour of High and Low Density Polymeric Foams, Mat.-wiss. u. Werkstofftech. 40(3): 126-132 (2009).
[19] Colquhoun H.M., Chappell D., Lewis A.L., Lewis D.F., Finlan G.T., Williams P.J., Chlorine Tolerant, Multilayer Reverse-Osmosis Membranes with High Permeate Flux and High Salt Rejection, J. Mater. Chem., 20(22): 4629-4634(2010).
[20] Tajeddin B., Ramedani.N., Preparation and Characterization (Mechanical and Water Absorption Properties) of CMC/PVA/Clay Nanocomposite Films, Iran. J. Chem. Chem. Eng. (IJCCE), 35(3): 9-15 (2016).
[21] Mallakpour S., Dinari M., Synthesis and Properties of Biodegradable Poly(vinyl alcohol)/Organo-nanoclay Bionanocomposites, J. Polym. Environ., 20(3): 732-740 (2012).

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