logging in or signing up Poster suranjana26 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Copy Does not support media & animations WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 95 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: February 01, 2012 This Presentation is Public Favorites: 0 Presentation Description On Superabsorbent Comments Posting comment... Premium member Presentation Transcript PowerPoint Presentation: Poster title goes here, containing strictly only the essential number of words... Institute /company logo here Ms. Suranjana Datta Chaudhuri ,Parag Kulkarni , Lakhan Kalwale Maharashtra Institute of Technology, Aurangabad NH-211,Satara Village Road, Aurangabad – 431028, M.S. Email:firstname.lastname@example.org Studies on Poly (acrylic acid)/Starch/Bentonite Superabsorbent Composite: Synthesis and Characterization C Scanning Electron Microscopy The micrographs of crosslinked PAA and superabsorbent composites are shown in Figure 7(a) and (b) respectively. The SEM micrograph of crosslinked PAA, which has water absorbency of 81.6g/g, is porous. In addition, superabsorbent has a greater absorbency and shows a structure [Fig. 7(b)],where starch and clay agglomerate can be seen whereas PAA has a fine structure[Fig. 7(a)]. These observations are in good agreement with our water-absorbency observations. Materials Introduction Superabsorbent polymers are moderately cross linked hydrophilic 3D polymer networks exhibit the ability to swell in water, saline or biological fluids. They retain significant fraction of them within their structure but they do not dissolve in water. Superabsorbents made from synthetic polymers possess excellent characteristics, the limitations of these materials in comparison to the natural based ones seem to be worth noting. The toxicity and non biodegradability may create environmental problems and limit their uses. So the new types of multi-component superabsorbents derived from naturally available raw materials are desired, and the organic–inorganic composites of natural polysaccharides with inorganic clays undoubtedly become promising materials because they showed both excellent performance and environmental friendly characteristics Potato Starch was obtained from Loba Chemie Pvt Ltd, Acrylic acid (AA) monomer was supplied by S.D.Fine-Chem Ltd, Mumbai, Potassium persulfate (KPS, initiator) was procured from Qualigens Fine Chemicals, N,N′-methylene bisacrylamide (MBA) as a crosslinking agent was supplied by Chemika Biochemika Reagents, Mumbai. Bentonite Clay was procured from Kolkata. All solutions were prepared in distilled water. The polymerization temperature was kept constant at 70 ± 0.1 0 C, using a thermostat. Conclusion and Future Work References Results and Discussions IR Spectra Comparison of the infrared spectra of Bentonite and starch – graft-poly(acrylic acid)/bentonite superabsorbent (with 40% neutralization degree, 0.5% clay) are shown in fig 1 and 2. Table 1: Effect of weight ratio of AA to Starch in the feed on the water absorbency of the superabsorbent composite @ @ Reaction conditions: Reaction Temperature, 70 0 C , 40 % neutralization degree of AA, 0.5% clay, Initiator and Crosslinker 0.75%, 0.375% and 1.25% in the above composites respectively. Fig: 1 Fig 1: Infrared spectra of (A) Bentonite, (B) Starch & (C)PAA/Starch/Bentonite Superabsorbent Composite Fig: 2 Fig 2:Infrared spectra of Acrylic Acid AA:Starch Water Absorbency(g/g) 1:1 98.3 1:3 87.5 3:1 110.32 Fig 3 Fig : 3 Effect of Initiator Content on distilled Water absorbency of the superabsorbent Fig : 4 Effect of Cross Linker Content on distilled Water absorbency of the superabsorbent Fig 4 Fig : 5 Effect of Clay Content on distilled Water absorbency of the superabsorbent Fig 5 Fig : 6 Effect of Clay Content on distilled Water and NaCl absorbency of the superabsorbent Reaction conditions: Reaction Temperature, 70 0 C , 40 % neutralization degree of AA, 1.25% Initiator and 1.25% Crosslinker,AA:Starch 3:1 . Fig 5 Fig 7a: Scanning electron micrograph of Crosslinked PAA Fig 7b: Scanning electron micrograph of Superabsorbent A novel starch-graft-poly(acrylic acid)/bentonite superabsorbent composite was synthesized by graft copolymerization reaction of starch and AA in presence of bentonite clay powder in aqueous solution. In our experiment the optimum synthesizing conditions were as follows: weight ration of AA to starch 3:1, initiator content 1.25%, crosslinker 1.25%. the superabsorbent composite prepared under optimum condition exhibited absorption of 123.83 and 40.41 g H 2 O/g sample in distilled water and in 0.2%NaCl solution respectively. This approach of preparation of superabsorbents utilizing natural resources like starch, clay would certainly reduce the production cost as well as make the material environment friendly. This types of materials also find applications in agriculture and horticulture. Gross, J.R., 1990. In: Brannon-peppas, L., Harland, R.S. (Eds), Absorbent Polymer Technology. Elsevier Science, New York, pp. 3—22. Buchholz,F.L. 1990. In: Brannon-peppas, L., Harland, R.S. (Eds), Absorbent Polymer Technology. Elsevier Science, New York, pp. 23—44. Lokhande, H.T., Gotmare, V.D., 1999. Utilization of textile loomwaste as a highly absorbent polymer through graft copolymerization. Bio-resource Technology 68, 283—286. Mohana Raju, K., Padmanabha Raju, M., 2001. Synthesis and swelling properties of superabsorbent copolymers. Advances in polymer Technology 20, 146—154. Superabsorbent hydrogel composites kourosh kaviri, M.j. Zohuriaan- Mehr. Polymers for Advanced Technology Volume 14, issue 6, page 438—444, June 2003. Wu, J. H.; Lin, J. M.; Li, G. Q.; Wei, C. Q. Polym Int 2001, 50, 1050. Li, A.; Wang, A. Q.; Chen, J. M. J Appl Polym Sci 2004, 92, 1596 You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.