Day 1 :
Department of Chemical Engineering, Indian Institute of Technology Guwahati Assam -781039 India,
Keynote: Effect of Functionalized biopolymers on Stereocomplexation and Properties of Poly (Lactic Acid) Nanocomposite Films, Trays and 3D Printed Implants
Time : 10:50-11:50
Prof. Vimal Katiyar is a Coordinator of Centre of Excellence for Sustainable Polymers, in the department of Chemical Engineering at IIT Guwahati, India. The centre of excellence on sustainable polymers is focusing on development of cost-effective, bio-based and biodegradable plastic products and related technologies using various feedstock including biopolymers such as cellulose, chitosan, proteins, various protein grafted polysaccharides. He has published more than seventy peer reviewed publications in highly reputed journals such as American Chemical Society and Nature publishing journals. He has supervised seven PhD students and more than twenty students are pursuing PhD under his supervision. His recently featured book entitled as ‘Bio-based Plastics for Food Packaging Applications’ is published by Smithers Rapra, UK. He is a co-inventor of numerous granted patents in various countries including India, USA, Canada, Europe, Japan, etc. His research group has received multiple national and international innovation awards in the development of bio-based polymeric products, nanobiomaterials, and related technologies.
This presentation highlights the use of available bio-resources for value added sustainable polymeric products for Engineering, Commodity and Biomadical Applications. Biopolymers can be extracted from renewable feedstock such as plants, marine animals, insects, etc. It is noteworthy to mention that so far biopolymers extracted from these sources have limited applications in large scale plastic production. Among the available bio-based synthetic plastics, polylactic acid (PLA) has made its own place due to its biodegradability and potential to replace conventional fossil based plastics. It is noteworthy to mention that properties such as melting point, heat deflection temperature and gas barrier properties limits its use in high temperature commodity and engineering applications. However, these limitations can be overcome by developing new class of high molecular weight stereocomplex PLA (sc-PLA). In this context, we have synthesized sc-PLA and its sc-PLA-bionanocomposites by using different biobased nanofillers which includes cellulose nanocrystals, silk nanocrystals, modified chitosan, etc. The GPC analysis reveals that the synthesized stereo-complex based bionanocomposites have molecular weight higher than 100 kDa. The formation of stereocomplex crystallites is confirmed by the XRD analysis. Melting point of the composite is increased even higher than 225°C which suggests the formation of stereocomplex crystallites and the crystallization temperature is enhanced upto ~155°C at nanofillers loading of 5 wt%. Due to the presence of various bionanofillers, ultimate tensile strength is enhanced significantly. Based on the studies, it can be concluded that bionanofillers are good candidates for enhancing the stereocomplexation in the PLA. In this talk, fabrication strategies for synthesis of stereocomplex-PLA-bionanocomposites and evaluation of their properties along with possible applications will be discussed. This talk will also include the processing of these bionanocomposites into caste films and injection molded products for biomadical applications.
University of Illinois, USA
Keynote: Biopolymer-derived nanofibers and their applications as biomedical materials and adsorbents for heavy metals removal from polluted water
Time : 9:30-10:30
MSc-1977 (in Applied Physics), PhD (in Physics and Mathematics)-1980, DSc (Habilitation, (in Physics and Mathematics)-1989. Affiliations: The Institute for Problems in Mechanics of the Academy of Sciences of the USSR, Moscow (1977-1990); Professor at The Technion-Israel Institute of Technology (1990-2006; Eduard Pestel Chair Professor in Mechanical Engineering at The Technion in 1999-2006); Distinguished Professor at The University of Illinois at Chicago, USA (2006-present); Fellow of the American Physical Society. Prof. Yarin is the author of 4 books, 12 book chapters, 310 research papers, and 6 patents. Prof. Yarin was the Fellow of the Rashi Foundation, The Israel Academy of Sciences and Humanities, and was awarded Gutwirth Award, Hershel Rich Prize and Prize for Technological Development for Defense against Terror of the American-Technion Society. He is one of the three co-Editors of “Springer Handbook of Experimental Fluid Mechanics”, 2007, and the Associate Editor of the journal “Experiments in Fluids”.
Solution blowing of such plant-derived biomaterials as soy protein, zein, lignin, oats, sodium alginate and cellulose acetate, and such animal-derived biomaterials as silk protein (sericin), chitosan and bovine serum albumin, was demonstrated as a versatile, robust and industrially scalable approach to form monolithic and core-shell nanofibers from bio-waste. Mechanical properties of such nanofiber mats were investigated. The collected nanofiber mats were also bonded both chemically (using aldehydes and ionic cross-linkers) and physically (by means of wet and thermal treatment) to increase the tensile strength to widen the range of applications of such green nonwovens. Fluorescent dye Rhodamine B was used as a model hydrophilic drug in controlled release experiments after it had been encapsulated in solution-blown soy protein-containing hydrophilic nanofibers and the release kinetics associated with dye desorption was studied in detail. Also, the antibacterial activity of solution-blown soy protein nanofiber mats decorated with silver nanoparticles was studied. Nanofiber membranes containing such biopolymers as lignin, oats, soy protein, sodium alginate and chitosan were used for heavy metals adsorption from aqueous solutions in equilibrium in the batch experiments, as well as under the throughflow conditions. The results revealed attractive capabilities of these inexpensive nano-textured biopolymer adsorbents formed from waste materials using the process scalable to the industrial level. The results also elucidated the physico-chemical mechanisms of heavy metal adsorption on biopolymers.