clri_logo Dr. S.N. Jaisankar
Scientist E1
Polymer Lab
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Academic Qualifications

Ph. D. (Polymer Technology), Anna University, Chennai, India.

M. Tech. (Polymer Technology), Cochin University of Science and Technology, Cochin, India.

M.Sc. (Applied Chemistry), Anna University, Chennai, India.

Research Associate Fellow, Department of Chemistry and Biochemistry, The University of Oklahoma, USA (2007-2008) on sabbatical.
Personal Details
Address

 Dr. S.N. Jaisankar
Scientist E1
Polymer Lab
Central Leather Research Institute
Adyar, Chennai – 600 020
e-mail: snjsankar@clri.res.in
             snjaio@yahoo.com
 Phone: +91 44 24422059
Fax: +91 – 44 – 24911589
 
Marital status Married
Date Of Birth

15-04-1964
Nationality Indian
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Research Interest
  • Carbon nanotubes research.
  • Bio-inspired carbon nanotube gels.
  • Polymer nanoclay composite melts processing.
  • Ionic liquid crystalline polyurethane blends and composites.
  • Polymers for use as a post tanning agent for leather.
Awards and Academic Recognition
  • GATE - 1992, (Graduate Aptitude Test in Engineering), conducted by The Ministry of Human Resource Development, Government of India.
  • Young Scientist Award from Department of Science and Technology (DST), Govt. of India, 2004 under Fast track.
  • BEST PAPER AWARD National conf. on Frontiers in Polymers -2006.
  • Complimentary membership SCI Journals, 2006.
  • Who’s Who in Science and Engineering, 9th Edition, (MARQUIS WHO’S WHO, USA) 2006.
  • Who’s Who in the World, 26th Edition, (MARQUIS WHO’S WHO, USA) 2009.
  • Honorary Faculty for ANNA UNIVERSITY.
  • One of the Guest Editors in the Journal of Thermal Analysis and Calorimetry, Springer, Dordrecht, the Netherlands – 2007.
  • Papers presented at ACS and AIChE conference, USA.

    • One of the subject experts to review and revise the syllabus and curriculum for the M.Tech (Polymer Engineering) courses in the Central Plastic Engineering and Technology, (CIPET), Chennai-32.
Polymer functionalized carbon nanotubes
Since the discovery of carbon nanotubes, there has been an intense effort to characterize and understand their properties and structural details, in order to enable their medical, electronic, and mechanical applications. Raman, near-IR, UV-Vis, and thermogravimetric analysis (TGA), have been employed to characterize carbon nanotubes to study the growth, functionalization, and electric and magnetic response of single wall carbon nanotubes (SWNTs).

Carbon nanotubes were functionalized along their side walls/end on with the polyurethane ionomers, acrylcates. An in-situ reaction, initiated by the production of free radicals upon the decomposition of peroxide during high temperature phase of processing, allows for the linkage of the carbon nanotubes to the surrounding acrylate matrix via covalent bond. The resulting polymerized functionalized carbon nanotubes were analyzed.




Raman spectra (633 nm) of (A) p-SWNT displays a small D-band, which is greatly increased in the products, (B) Functionalized-SWNT (Donna J. Nelson et al., J. Phys. Chem. C. 2007, 111 (48) 17872–17878).
Polymer clay nanocomposites
Montmorillonite (MMT) was modified by cationic exchange between MMT and different aromatic amines in an aqueous solution. A new nanocomposite consisting of polyurethane ionomers – and functionalized MMT were interpenetrated with acrylic modified polyurethane to form interpenetrating polymer networks (IPNs). Polymer intercalated nanocomposites were shown in Figures.

Major Achivements
1) R&D (Technology developed to the Industries)
  • Development of water based super plasticizers from melamine formaldehyde sulfonamide resin for application in concrete admixture. This technology was successfully demonstrated by S. N. Jaisankar, T. Sivagamasundari, R. Ganesh Jeevan, and Ganga R. to M/s. Ultra tile Pvt. Ltd., Chennai.
Tiles developed from the superplasticizers

2) Ionic polymer liquid crystals: Synthesis, characterization and their thermoplastic blends [SERC-DST sponsored project, 2004-2007].
New Observations:
  • New class of different low molecular weight ionic liquid crystal poly(urethane-urea)s and functionalized diurethane liquid crystals were prepared successfully.
  • Al the liquid crystal poly(urethane-urea)s show the nematic mesophase.
  • Incorporation of ionic PUUs in TPU/SAN melt blends as a compatibilizers.
  • All the polymer melts exhibited non-Newtonian flow behaviour in the shear rate range studied.
  • The melt viscosity of the compatibilized blends did not show shear-thinning behavior, which could be due to small addition of ionic liquid crystalline PUUs.
  • The ionic liquid crystalline poly(urethane-urea), showed good compatibilizers for TPU/SAN melt blends.

Optical micrograph of anionic liquid crystalline PUUs a) BHP4 of Schlieren double axial texture at 116.8oC (cooling) and b) 123.6 oC
(S.N.Jaisankar et al, Polymer, 2009)

Effect of temperature on melt viscosity of TPU / SAN blends
DMA of TPU/SAN 70:30 blends, Storage modulus (E’) and tan ?.

Patents Filed

  • A Novel process for the development of corrosion resistant thin organic coating for zinc coated steel sheets. A. Singh, Nitu Rani, N. Bandyopadhyay, T.Venugopal, S.N. Jaisankar and Ganga R. and T.Ramasami. (430 KOL 2005).

  • A Novel water soluble sulfonated melamine formaldehyde ionic condensate and a process for the preparation thereof , S.N. Jaisankar, T.Sivagamasundari, R. Ganesh Jeevan, J. Kanagaraj, Sanjeev Gupta and Ganga R. (2135 DEL 2008).

  • A novel insole sheet and a process for the preparation thereof, G. Saraswathy, G. Gopalakrishna, B. N. Das, R. Rajaraman, Y. Lakshminarayana, S. N. Jaisankar, Ganga R., A. B. Mandal. (775 DEL 2008).

Society/ Memberships
  1. Life member society for Polymer Science, India.
  2. Life member society for Chemical Research Society of India.
  3. Life member society for Polymer Science and Technology, India.
  4. Life member society for Indian Liquid Crystal Society.
  5. Life member society for Indian Thermal Analysis Society.
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Publications
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