AMADEus Seminars - Thursday 16 & Monday 20 July 2015, 11:00 am - ENSCBP (Amphi 3) - Dr. Prakash P. Wadgaonkar16/07 - 20/07 11h - 12h
Polymer Science and Engineering Division
National Chemical Laboratory,
Dr. Homi Bhabha Road,
Pune 411008, INDIA
Thursday 16 July 2015: "From Agricultural Waste Products to Value Added Monomers: Exploitation of Cashew Nut Shell Liquid (CNSL)and Lignin-Derived Aromatic Chemicals"
Sustainability, industrial ecology, eco-efficiency and green chemistry are guiding the development of the next generation of advanced materials, products and processes. World-wide potential demands for replacing petroleum-derived raw materials with renewable plant-based ones in production of valuable polymeric materials are quite significant from the societal and environmental view points. Therefore, using inexpensive renewable resources has greatly attracted the attention of many researchers. Biomass constitutes a renewable source of natural products able to be used as unfailing starting materials to substitute petroleum derivatives. Oils and fats of vegetable and animal origin are historically and currently the most important renewable feedstocks of the chemical industry.
In recent years, among other natural compounds the use of cashew nut shell liquid (CNSL) and lignin as the starting materials to obtain various value added chemicals has attracted the attention of scientists. CNSL and lignin are renewable natural resources and have immense potential to satisfy many material requirements in diverse fields of applications. In the interest of economy, natural resource conservation, ecology, integrated agricultural development and overall progress of mankind, CNSL and lignin have potential to contribute immensely.
The present seminar will summarize our efforts on the valorization of CNSL and lignin derived aromatic chemicals for design and synthesis of a range of monomers and polymer additives. The difunctional monomers such as dihalides, diphenols, diacids, dialdehydes, diisocyanates, diamines, diacyl hydrazides, etc. were synthesized and utilized for preparation of a host of high performance polymers such as polyurethanes, polyimides, polyamides, poly(amide-imide)s, polyazomethines, polyesters, polyetheretherketones etc. The structure-property relationship, with a focus on process ability characteristics, in these polymeric systems were investigated.
Monday 20 July 2015: "Difunctional Monomers Containing ''Clickable'' Groups for Synthesis of Step Growth Polymers"
Step growth polymers such as polyurethanes, aromatic polyamides and polyesters constitute an important class of polymers which find applications in diverse fields. A considerable research efforts have been expended to tune the properties of these polymers by making use of appropriately designed difunctional monomers viz diisocyanates,diamines, diacids and diphenols. Another important development in the recent years is the alteration of properties of these polymers by post polymerization modification of the various pendant functional groups intentionally introduced into these polymeric systems via suitable monomers. The presence of pendant azido, furyl, maleimido, alkynyl and alkenyl groups is of particular interest as these groups provide an useful platform for efficient post polymerization modification by click chemistry approach.
In the present seminar, I shall elaborate on our efforts directed towards design and synthesis of difunctional monomers containing pendant “clickable” groups viz. azido, furyl, maleimido, alkynyl and alkenyl and high performance polymers namely polyurethanes, aromatic polyamides and polyesters based on these monomers. The exploitation of pendant clickable groups for chemical modification reactions would be highlighted.