Day 2 :
Professor Department of Mechanical Engineering Stevens Institute of Technology Castle Point on the Hudson, Hoboken
Time : 10:20=11:20
Dr. E. H. Yang is a full professor of Mechanical Engineering Department at Stevens Institute of Technology. He received Ph.D. degrees from Ajou University, Korea. After his postdoctoral training at University of Tokyo and at California Institute of Technology, he joined NASA's Jet Propulsion Laboratory where he became a Senior Member of the Engineering Staff. At JPL, he received a number of awards, including NASA ICB Space Act Awards, Bonus (Level B and C) Awards and a number of Class 1 NASA Tech Brief Awards. In recognition of his excellence in advancing the use of MEMS-based actuators for NASA's space applications, he received the prestigious Lew Allen Award for Excellence at JPL in 2003. He is an Associate Editor and/or Editorial Board of several journals including Nature’s Scientific Reports.
The control of adhesion of liquid droplets on solid substrates has broad implications in surface cleaning, water treatment, microfluidics, biochemistry, and lab-on-a-chip devices. An earlier report using a conjugated polymer, polyaniline (PANI) doped with dodecylbenzene sulfonic acid (DBSA), demonstrates the control of the contact angle of a liquid droplet. Poly(3,4-ethylenedioxythiophene(PEDOT) polymers bearing imidazolium ionic-liquid moieties (PEDOT-Im) show multi-responsive properties to a variety of stimuli, such as temperature, pH, oxidative doping, and the presence of anions. Recently, there has been a growing number of reports concerning the liquid adhesion and wetting on polypyrrole surfaces. Here we show the development and application of smart polymer functional surfaces using dodecylbenzenesulfonate-doped polypyrrole (PPy(DBS)); we demonstrate a novel in situ control of droplet pinning on the polymer surface, enabling the control of droplet adhesion from strongly pinned to extremely slippery (and vice versa). The pinning of organic droplets on the surfaces is dramatically controlled in situ, presenting a great potential for manipulation and control of liquid droplets for various applications including oil separation, water treatment and anti-bacterial surfaces. We believe that our work represents a major advance in materials science and engineering, especially pertaining to those topics that involve functional and tunable surfaces
National Taiwan University,Taiwan
Time : 9:00-10:00
Tien-Yau Luh obtained his Ph.D. degree from the University of Chicago (with L. M. Stock) in 1974. After spending two years of postdoctoral research at the University of Minnesota (with P. G. Gassman), he began his independent research at the Chinese University of Hong Kong in 1976. He moved back in 1988 to his alma mater, National Taiwan University where he has been University Chair Professor. He officially retired from his present post in August of 2016 and was appointed as Distinguished Chair Professor and Professor Emeritus. He has published 290 papers and has received numerous awards. He is also serving as a member of the advisory/editorial board for Chemical Communications, Chemistry-A European Journal, The Chemical Record, Bulletin of the Chemical Society of Japan, Tetrahedron, Tetrahedron Letters and Springer Lecture Notes in Chemistry. His current research interests include organometallic chemistry in polymer synthesis mimicking biomacromolecules, and chemistry of materials.
A ladderphane is a ladder-like polymer constituted of multiple layers of rigid linkers covalently linked to two or more polymeric backbones. The linkers can be planar aromatic, antiaromatic, macrocyclic metal complexes, or three-dimensional organic or organometallic moieties. Structurally, a DNA molecule is a special kind of ladderphane, where the cofacially aligned base-pair pendants are connected complementarily through hydrogen bonding.
Two norbornene or cyclobutene moieties fused with N-arylpyrrolidine are employed to connect covalently with rigid linkers. Ring opening metathesis polymerizations (ROMP) of these monomers using the ruthenium or molybdenum catalyst give the corresponding symmetrical double-stranded ladderphanes. Depending on the catalyst, double bonds in these ladderphanes can be either E or Z selectively. The presence of N-arylpyrrolidene moiety is crucial to control the isotactic stereoselectivity. The linkers in these ladderphanes are aligned coherently along the longitudinal axis of the polymer. Strong interactions between them may take place as evidenced by fluorescence quenching, excimer formation, Soret band splitting or electron hopping. Chiral helical ladderphanes are synthesized by incorporating chiral linkers.
These ladderphanes can easily aggregate to form a two-dimensional highly ordered array on graphite surface up to submicron area as revealed by scanning transmission microscopy (STM). Such assembly furnishes an entry to orient planar arene moieties cofacially, while each linear array of such arenes is insulated from the adjacent arrays by the polymeric backbones.
Sequential polymerization of a monomer having two different polymerizable groups or replication protocol offers useful entries for unsymmetical ladderphanes. This route furnishes template synthesis of daughter polymers with well-controlled chain lengths and polydispersity.
When cyclopropene having spirally connected N-ary azetidine is used for ROMP, substituted alt-methylene-vinylene with all double bonds in trans configuration is obtained. The stereospecificity can be considered as mimicking proofreading and repair in DNA synthesis. Two-dimensional polymers obtained from ROMP of biscyclopropene will be
- Biodegradable Polymeric Materials
State University of Sao Paulo, Brazil
Time : 12:50-13:35
The change of habit and the increase in consumerism in the last decades have led to technological innovations and consequently to the greater production of consumer products, which has generated an increase in the production of packaging. However, its disorderly disposal generates a large volume of solid waste, which is associated with the environmental impact. Concern for this situation, we ought to develop alternative means to reduce such impacts and may highlight the reuse and recycling of packaging. Plastics represent the largest share in the value of Brazilian packaging production, corresponding to 38.85% of the total. The employment level of the packaging industry reached 216973 jobs in June 2017. The plastic industry is the one that most employs, totaling in June 2017, 115307 formal jobs, corresponding to 53.14% of the total jobs in the sector. The plastics sector accounts for 59.58% of total imports. With respect to the results obtained in the last 10 years of research, the reuse of recycled commercial polymers by plasma surface treatment is emphasized. Then, it is possible to change the character of wetting of the polymers, being able to obtain high hydrophobic or high hydrophilic surfaces, maintaining very smoothness, high optical transparency in the visible region (up to 80%) and improving gas barrier (down to 1 g/m2day) mainly for PET and LDPE, which makes the plasma immersion treatment interesting for the food packaging
Pericles Lopes Sant’Ana has obtained his Bachelor’s Degree in Production Engineering from Federal University of Viçosa, Brazil. He has completed his Master’s and Doctoral Degrees in Materials Science and Technology from the State University of Sao Paulo. He has 10 years of experience in Research and Development, working with plasma surface treatment and thin films deposition for food packaging and optical devices. Recently he developed PVC, PET and LDPE polymers using plasma immersion techniques.
Polymer Institute SAS, Slovakia
Time : 11:20-12:05
IVAN CHODAK Affiliation : Polymer Institute of the Slovak Academy of Sciences Job status : Senior scientist Department of Composite Materials Full Professor of Macromolecular Science, Slovak Technical University Education and Professional carreer : 1960 - 1965 Slovak Technical University, Faculty of Chemical Technology, Bratislava 1965 - 1970 Matador, rubber factory, Bratislava 1970 - Polymer Institute, Slovak Acad. Aci., BRATISLAVA 1970 - 1973 PhD Student 1975 PhD 1973 - 1981 Scientist 1982 - 2010 Head of Department of Composite Thermoplastics 1989 – 1990 Deputy Director 1997 DSc 2000 Associated Professor of Macromolecular Science 2005-2009 Member of Presidium of the Slovak Academy of Sciences 2006 Full professor of Macromolecular Science LEAVES OF ABSENCE 1981 - 1982 One-year sabbatical leave at Clarkson University, Potsdam, NY 1983 - 1997 Several short-term stays (up to two months), e.g. Techn. Univ. Eindhoven, Univ. Quebec Trois Rivieres, ENSAM Paris, CNR Arco Felice, etc. AWARDS 1989 - Slovak National Prize for excellent results in polypropylene modification (member of a team of 5 scientists) 1993 - Silver Medal of Dionýz Štúr for "A Significant Contribution to a Development of Natural Sciences" 2003 – Medal of Slovak Academy of Sciences for Achievements in Science 2012 – Award of the Minister of Education of Slovak Republic as the Scientific Personality of the Year 2014 – Gold Medal of the Slovak Academy of Sciences Scientific interests Multiphase systems with a modified polymeric matrix, synthesis and properties.
Biodegradable plastics undergo to substantial changes due to degradation by enzymes produced by various bacteria. From application point of view, modification of physical properties is important, occuring even when the testing specimens are apparently unchanged.
Degradation in compost of polylactic acid (PLA), PLA with a plasticizer triacetin (TAC), and a mixture of PLA / polyhydroxybutyrate (PHB) / TAC proceeded at temperature 58 oC up to 16 days and the biodegradation degree was determined by measuring the content of evolved carbon. The degradation rate was found to vary a little for the three samples.
While the biodegradation tests were performed almost to complete biodegradation of the materials to carbon dioxide and water, physical properties could be measured only for the first 8 days and in some cases up to 16 days when it was possible to separate the material from the compost. At longer periods the materials have been disintegrated to small fragments and separation of the sample from compost was impossible.
Number of testing methods was applied. Molecular weight and molecular weight distribution was determined by GPC, supported by measuring the viscosity by rheology. Structure of the materials were estimated from changes in Tg and crystallinity. Mechanical properties of samples and the data were compared with information obtained from dynamic mechanical analysis (DMTA).
The conclusions have been made regarding the effect of TAC and PHB presence on the biodegradation of PLA, and related changes concerning the structure / mechanical relations.
Acknowledgement: The supported from projects VEGA 1/0570/17, APVV 15-0741 is appreciated.
- Biopolymers from Renewable Resources
University of Natural Resources Austria
Eva-Marieke Lems received her Master degree in "Biomaterials Science and Technology" from BOKU University (Vienna) in 2017. Now she is doing her PhD with the entitled topic "Lignocellulosic materials and their application possibilities " which is supervised by Prof. Wolfgang Gindl-Altmutter from BOKU
Lightweight foams are of general interest in a diversity of applications because of their low density and high specific surface area. Since there is a special interest to replace fossil-based polymers with polymers from renewable and biodegradable resources, cellulose nanofibrils and lignocellulosic nanofibrils were used to prepare bio-based foams, which could e.g. be used for insulating materials.
For the preparation of the porous materials, lignin-free bleached wood pulp, termed MFC, and microfibrillated cellulose with 17 % lignin content (MFLC) were used in aqueous suspensions. Furfuryl alcohol and maleic anhydride were added to the slurry, resulting in ratios of fibrils to furfuryl alcohol of 0.00, 0.03, 0.06, 0.11, 0.20, 0.33, and 0.50. After mixing with a high-shear blender, the mixtures were placed in an oven at 80 °C for 24 h in order to polymerize the furfuryl alcohol. Thereafter, foams were prepared by freeze-drying.
Characterization of the foams was performed by Scanning Electron Microscopy (SEM), ATR-Fourier-Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), as well as mechanical testing (e.g. compression tests). Furfuryl alcohol content was found to significantly affect foam density. Furthermore, mechanical properties were significantly higher for MFLC-based foams.
- Smart and Functional Polymers
New Functional PolymersNew functional polymers represent one of the current area of research interests in materials science. It is well-known that functional materials may have wide range of applications, where they can be used as ion exchangers, molecular sieves and enhancing hydrogen storage capacity etc. However, energetic polymers have not been well explored in the field. A few newly assembled polymers with energetic functions and potential applications will be discussed along with the novel structural features.