Day :
- Polymeric Material Chemistry and Physics | Polymer Synthesis and Polymerization |3D Printing Polymers | Synthetic and green Polymers
Session Introduction
Mr.Tugay Pehlivan
PhD
Title: Investigation of Controlled Release of Fragrances Combined with Ethyl Vinyl Acetate (EVA)
Biography:
Tugay Pehlivan Froma Fragrances and Flavors, 34538, Istanbul/Turkey
Abstract:
The sense of smell is the ability to perceive odors caused by the chemical structures of the molecules in the environment. Human and environmental interactions have been carried out for centuries through essences. The use of fragrances is often essential for products to make them smell better, to give them a personality. There are used to create a more “natural” aroma and they are also used to cover up an offending odor. However to increase the efficacy of fragrance raw materials, controlled release is used. Over the years controlled release of fragrances has gained importance in the flavor and fragrance industry. Polymers like ethylene-vinyl acetate (EVA) have been used in industry for applications including controlled release of fragrances and other active ingredients.
Ms.Sara AlMahri
Al-Mahri has completed her Masters degree from Khalifa University of Science and Technology.
Title: Evaluation of Energy Absorption Performance of Thermoplastic Polyurethane Auxetic Lattice Structures via Additive Manufacturing
Biography:
Al-Mahri has completed her Masters degree from Khalifa University of Science and Technology. She is now working as a Seniro Mechanical Engineer at the Technology Innovation Instituite (TII) in the UAE. Al-Nahdi is a senior graduate student pursuing her Masters degree in Khalifa University of Science and Technology in the Mechanical Engineering department
Abstract:
Materials exhibiting a negative Poisson’s ratio, also known as auxetics, exhibit superior mechanical properties such as enhanced indentation resistance, impact shielding capability, and enhanced fracture resistance. In this paper, an experimental approach is taken to study, evaluate and utilize flexible auxetic structures made of thermoplastic polyurethane (TPU) in energy absorption applications. The state-of-art additive manufacturing techniques enables the fabrication of such complex gemoetries via fused deposition modeling (FDM). Guided by experimental tests, mechanical and energy absorption response of the 3D printed lattice auxetics were measured under quasi-static uniaxial and cyclic compressive loadings. Moreover, a further study of the auxetic degree effect on the performance of the structure has been conducted and compared to the regular non-auxetic honeycombs structure. It was found that by integrating auxetic geometries into the lattice structures, both mechanical and energy absorption responses show significant enhancement. Auxetic S-Shape lattice structure showed 110% enhanced energy absorption, 130% enhanced modulus and 120% enhanced strength when compared to the regular honeycomb structure. The findings reported here provide a promising approach to design and fabricate auxetic lattice structures as they offer great potential in the field of personal protection where they have superior potential against impact in harsh environments.
Mr.Vinayak M. Kamble
Vinayak Kamble is pursuing his PhD in Institute of Chemical Technology Mumbai.
Title: Biological activity and Controlled Release Performance of Microencapsulated Chlorpyrifos against Helicoverpa armigera in Chickpea (Cicer arietinum)
Biography:
Vinayak Kamble is pursuing his PhD in Institute of Chemical Technology, Mumbai. He has published more than 8 papers in reputed journals.
Abstract:
This study focused on the development of the controlled release formulation of chlorpyrifos for the agricultural application using microencapsulation. Chlorpyrifos is a broad-spectrum organophosphorus insecticide that is widely used to control agricultural pests. In order to prolong the persistence of chlorpyrifos, it was microencapsulated via interfacial polymerization by the polyurea as a wall material. The release dynamics and field efficacy of the chlorpyrifos were evaluated in the present study. It was found that the encapsulation of the chlorpyrifos significantly extended the insecticide release. The diameter of chlorpyrifos loaded polyurea microcapsules found in the range of 1-5 µm with an excellent encapsulation efficiency of > 90%. The SEM images of the ruptured microcapsule show the formation of the core and shell structure. The release kinetics and controlled release profile were investigated by the HPLC. The microencapsulated chlorpyrifos show sustained release performance over 60 days with high pesticide loading. The LC50 and LC90 values of microencapsulated chlorpyrifos were 12.4 and 63.56 mg a.i./L, respectively, after 72 h of exposure. Based on LC50 values, results of bioassay showed the microencapsulated chlorpyrifos was highly toxic against 3rd instar Helicoverpa armigera. Moreover, microencapsulation found effective in controlling the Helicoverpa Armigera population on chickpea than that of conventional emulsion formulation.
Mr. Sanjeet Kumar Singh
Sanjeet Kumar Singh has completed his M.Tech from National Institute of TechnologyIndian Institute of Technology Madras, Chennai, India
Title: A comparative study of the structural analysis of Polymethylene oxide (PMO), Polyethylene oxide (PEO) and Polytrimethylene oxide at above and below Tg by Molecular Dynamics Simulation
Biography:
Sanjeet Kumar Singh has completed his M.Tech from National Institute of Technology (NIT) Rourkela and is currently pursuing his PhD from Indian Institute of Technology (IIT) Madras.
Abstract:
Atomistic molecular dynamics simulations are carried out for poly(methylene oxide) (PMO) and poly(trimethylene oxide) (PTMO) using all atom force-field with the primary objective of comparing the structural details of these two polymers and with available data on poly(ethylene oxide) (PEO). Simulations are carried out at temperatures above and below Tg to investigate the glassy and melt states. Five independently generated amorphous high molecular weight samples consisting of chains of 100 repeating units are simulated for PMO and PTMO. Simulated samples are analyzed for molecular physical structure and thermodynamic properties. Structural analysis includes mean-squared radius of gyration, mean-squared end-to-end distance, dihedral distribution, angle distribution, intrachain and interchain radial distribution functions, intrachain bond orientation correlation function and free volume as a function of temperature. Dihedral angle distribution does not change significantly with increase in temperature, in agreement with results in literature [1]. The simulated data of mean-squared radius of gyration (