Keynote Lecturer
- Managing Director of Iran Polymer and Petrochemical Institute
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- Full time Prof., Department of Chemical & Petroleum Engineering, Sharif University of Tech., Tehran, Iran
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- Assistant professor: Iran Polymer and Petrochemical Institute, Tehran,Iran
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After a short introduction about the optoelectronic principles and devices, the technological requirements in developing optoelectronic devices will be reviewed. According to literature, the most important requirements are high refractive index polymers (HRIP) with n values over 1.7, optimum abbe number (20-30), low or zero birefringence and high optical clarity (transmittance over 90%). The high refractive index may be achieved either by introducing substituents with high molar refractions (intrinsic HRIPs) or by combining high-n nanoparticles within polymer matrix (HRIP nanocomposites). The aromatic rings, halogen atoms except fluorine and sulfur atoms are effective in increasing the n value of polymers. The incorporation of TiO2, ZrO2, SiO2, PbS and ZnS nanoparticles resulted in promising n values in HRIP nanocomposites. However, the well dispersion of nanoparticles in matrix still remains a main challenge in developing HRIP nanocomposites with high transparency.
- Full-Time Prof., Dep. Food Materials & Process Design Eng., GUASNR, IRAN
- Part-Time Prof., Director of Agri-Food Research Center, UVigo, SPAIN
- Adjunct Prof., SINANO, CHINA
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Propolis-loaded electrospun nanofibers (PENs) have been regarded as promising candidates for biomedical purposes such as wound healing dressing owing to their outstanding pharmacological and biological properties. This study focuses on the development of electrospun nanofibers with optimum levels of propolis (PRP) and polymer type (polycaprolactone (PCL) and polyvinyl alcohol (PVA)) to investigate the variation of the scaffold characteristics including porosity, average diameter, wettability, release, and tensile strength. The overall optimum region with the best characteristics was found to be at PCL/6% PRP and PVA/5% PRP. After selecting the optimal samples, the cytotoxicity assay showed no toxicity for the optimal concentrations of PRP. Furthermore, Fourier transform infrared (FTIR) spectra revealed that no new chemical functional groups were introduced in the PENs. Uniform fibers could be found in the optimum samples without the appearance of a bead-like structure in the fibers. In conclusion, nanofibers containing the optimal concentration of PRP with suitable properties can be used in biomedical and tissue engineering.
5. Dr. Ali Akbari
- Assistant professor: Urmia University of Medical Sciences (UMSU)
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Abstract
Polymers provide enormous opportunity to tailor antiviral activity via specific interaction with glycoproteins on the viral surface by varying molecular weight, type and degree of functionality, sequence distribution, extent of branching, and molecular architecture. Natural biopolymers with multiple functional groups like carrageenan, chitosan, and fucoidan are used directly to bind and form irreversible complexes with envelope glycoproteins on the viral surface to block virus-host cell interaction, fusion, and entry to the host cell. Natural nucleic acid polymers are used as antiviral agents after phosphorothioation to render them amphipathic and stabilization against nuclease degradation. Polymers deactivate the virus before cell internalization by inhibiting virus-host cell binding or after cell internalization by blocking virus replication. Brush polymers modified with sialic acid groups bind with high affinity to viral hemagglutinin to form complexes that block viral infection. Research results have demonstrated that natural and synthetic polymers are useful as broad-spectrum antiviral agents to fight against many different types of viral infections. Further preclinical research in animal models and clinical trials are needed to validate the antiviral activity of polymers to fight new viral infections in the absence of vaccines.
6. Dr. Akram Zamani
- Associate Professor: Industrial Biotechnology Swedish center for resource recovery, University of Borås, Borås, Sweden
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resulted in formation of mycelium, which is a branched network of fungal microfibers. Fungal microfibers were subjected to a wet spinning process and a continuous monofilament yarn was obtained. The fungal monofilament were biocompatible and exhibited antibacterial properties, which make them good candidates for biomedical applications. The fungal monofilament was successfully woven to a fabric. Furthermore, bioplastic and paper like materials were obtained
by wet laying the fungal microfibers. Treatment of the fungal biomass with vegetable tannins resulted in formation of soft sheets after wet laying, with properties comparable to natural leather. Fungal proteins were recovered as a valuable byproduct of the fungal textiles. The findings of this research demonstrate that food waste derived fungal textiles have a high potential as environmentally friendly textiles for different applications.
7. Dr. Fatemeh. Goharpey
- Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran
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Discontinuous shear thickening behavior are observed in polyhedron particle suspension which can be attributed to the heightened degree of inter-particle frictional contacts and subsequently the stronger fictional contact network. Additionally, it was found that polyhedron morphology enlarges the packing fraction range for shear jamming. Step up-down measurements also reveal a shear history hysteresis effect particle contact network configuration. Finally, it was found that the observed hysteresis loops in flow curves strongly depend on the volume fraction, which is enhanced with volume fraction and then collapses near the jamming packing fraction.
8- Dr. Nayere Taebnia
- Karolinska Institutet ( Department of Physiology and Pharmacology),Stockholm, Sweden
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Abstract
The field of tissue engineering is shifting towards the creation of complex in vitro tissue models to explain disease processes (disease modeling) and assess the toxicity and efficacy of therapies (i.e. drug testing). Tissue models, scalable to industrially relevant numbers, have been for long restricted to two-dimensional (2D) cell culture systems, which fail to recapitulate the complex three-dimensional (3D) microenvironment of the native tissues and consequently limit the predictive value of cellular response to the introduced stimuli. These limitations call for reliable in vitro models that capture more of the relevant complexity than traditional 2D cultures can achieve. Through various examples, this talk illustrates how advances in biomaterials, 3D(bio)printing, microfluidic devices and quantitative analyses are converging to allow the creation of more accurate in vitro models that capture some of the main complex features of the in vivo environment, and enable real-time monitoring of their function by applying various biopolymer-based sensing methodologies.
9- Dr.Vajiheh Behranvand
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"Worldwide fight against COVID‑19 using polymer science and nanotechnology"
Abstract
The role and importance of polymeric materials in human life are not hidden and these valuable materials are a part of our daily life. One of the lethal illnesses that humanity has ever seen is COVID-19 irrefutably. During the COVID-19 outbreak, diverse medical equipment and devices were designed and developed by using synthetic and natural polymers as infectious personal protective equipment such as masks, various types of face coverings, respirators, and gloves. On the other hand, for the enhancement of polymer capability, nanostructures have an efficient role in virus detection, prevention, protection, mitigation and control measures.
10. Dr. Ali Zarrabi
- Biomedical Engineering Department, Istinye University, Turkey
Email: alizarrabigmail.com
Subject of speech:
"Nanotheranostic Polymeric Platforms and Personalized Medicine: Recent Advances and Future Directions"
11. Prof. Clemens Holzer
- Department Kunststofftechnik, Montanuniversität Leoben, Otto Glöckel-Str., Leoben, Österreich, Austria
Email: Clemens.Holzerunileoben.ac.at
Subject of speech:
"Injection Moulding of flexible devices"
Abstract
The demand for low-cost, randomly shaped and lightweight electronic devices has increased significantly over the past years. Hereby one path is to employ the Injection Molded Structural Electronics (IMSE) process where electronic films are overmolded with a thermoplastic to form the final part. Those films can comprise surface mounted components, LEDs, capacitive sensors or flexible Printed Circuit Boards (flexPCBs) which are embedded between plastics sheets via lamination processes. Hence devices such as personal activity meters or (car) control panels with smooth surfaces can be produced that bypass the need of additional buttons and sliders. Elevated temperatures and shear stresses prevail during overmolding which can result in damaged parts after this final manufacturing step. Hence various factors such as the individual film(-layer) materials and injection molding parameters have to be considered carefully to ensure damage free manufacturing. The aim of this work was to investigate those aspects in principal by overmolding test film strips and to assess their visual integrity afterwards. These specimens consisted of a flexPCB encapsulated by two different thermoplastic polyurethanes (TPUs) as glue middle layer and polycarbonate (PC) or Polyethylene terephthalate (PET) sheets as outer layers. Injection molding parameter studies were performed where the films were inserted into a stepped plate mold and overmolded with PC using different melt temperatures, mold temperatures and injection speeds. The distortion on the films was found to be reduced with higher melt temperature, lower mold temperature and faster injection speed. At given molding settings films made of materials with the higher melting temperature performed better. Additional geometric conditions such as proximity to the gate and low mold thickness were found to affect the integrity of the produced films negatively.
12. Dr. Alireza Foroozani Behbahani
- post-doctoral researcher at the Johannes Gutenberg University of Mainz
Email: af.behbahaniiacm.forth.gr
Subject of speech:
"Atomistic and Coarse-grained Simulations of Polymer Melts and Nanocomposites"
Abstract
Molecular simulations are powerful and predictive tools for studying polymers in bulk and at interfaces. However, simulation of high molecular weight entangled polymers is not straightforward, because of the broad ranges of time and length scales involved in their motions. Here we present a hierarchical simulation methodology for the calculation of the dynamical and linear viscoelastic properties of polymer melts.
At the finest level, chains are described via an atomistic model. At a moderately coarse-grained (mCG) level, few atoms (e.g., one monomer) of the chain are lumped into one CG bead. The mCG potentials are derived based on the finer level atomistic model. Thorough the mCG model, moderately entangled chains can be simulated. Also, the results of the mCG model are used to parameterize a highly coarse-grained slip-spring model in which several monomers of the chain are mapped into one bead. We also present the results of atomistic simulations for the behavior of polymer melts in the vicinity of nanoparticles (NPs). Interfacial packing of polymer chains close tothe NP surface, statistics of the adsorbed chains, and interface induced dynamicalheterogeneities are discussed.
13. Prof. Naser Mohammadi
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Professor, Amirkabir University of Technology - Tehran Polytechnic, Iran
Email: mohamadiaut.ac.ir
Subject of speech:
"Effect of water infiltration rate on mechanical properties of heat treated crumb rubber containing cementitous mortar"
14. Dr. Shervin Ahmadi
- Head of Petrochemical Faculty, Iran Polymer and Petrochemical Institute, Tehran, Iran
Email: sh.ahmadiippi.ac.ir
Subject of speech:
"Manipulating the morphology of PA6/POE blends using graphene to achieve electrical properties"
15. Dr. Azadeh Seifi
- Assistant Professor, Gachsaran Collage of oil, Yasouj University, Iran
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Subject of speech:
Polymer-derived carbon aerogels are a unique class of highly porous nanostructure materials that have excellent properties such as low density, low thermal conductivity, and high specific surface area. Novolac is widely used in manufacture of these aerogels due to economic considerations and the high char yield of this polymer. The main route for synthesizing these materials is the initial sol-gel polymerization followed by a drying step to form the polymeric aerogel and a final carbonization process to derive the carbon aerogel. These materials have application potential in many scientific areas, especially in thermal management systems such as thermal insulators and thermal shields. However, the main drawback of the low thermal oxidation temperature (upper than 450 ºC) of these materials limits their widespread application. So, there is a need to modify these aerogels by preparing a composite aerogel with higher thermal stability. One of the most efficient ways to improve thermal stability is incorporating a more refractory phase component (Si-containing phase such as silica and silicon carbide) into the colloidal structure of the aerogel via the in-situ sol-gel polymerization. The synthesis route of these aerogel composites as well as their characterization and thermal performance were presented in this speech. Also, the Non-Parametric Kinetic analysis was introduced as the more reliable method than the other kinetic methods for evaluating the thermal oxidation kinetics of these nanostructure materials with highly porous character.
- Prof. Iran Polymer & Petrochemical Institute, Tehran, Iran
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- Prof. Iran Polymer & Petrochemical Institute, Tehran, Iran
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