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Vortragseinladung Prof. Marek Koutny und Dr. Petr Stloukal am 25. März 2015

Lecture at 10 a.m.: Biodegradable polymers in real conditions

Lecturer:

Assoc. Prof. Dr. Marek Koutny 
Tomas Bata University in Zlín, Faculty of Technology, Department of Environmental Protection Engineering, nám. T.G.Masaryka 5555, 760 01 Zlín, Czech Republic

Abstract:

The biodegradability of polymers and polymeric materials depends strongly on conditions to which they are exposed. Consequently the actual biodegradability could be a complex interrelation between several biotic and abiotic factors. Even materials in the seemingly homogenous group of polyesters like PCL, PBAT, PBS, PLA probably differ in their mechanism of the biodegradation. PLA and PBAT are both biodegraded almost exclusively under composting conditions but in the case PBAT this is probably caused with the requirement for specific enzymes produced by a group of thermophilic bacteria, PLA simply requires higher temperature because the abiotic hydrolysis of ester bonds, with its strongly temperature dependent kinetics, representing a necessary firsts step in the decomposition mechanism. Polymer biodegradation in real polymeric formulation could also be influenced by other components present in the given blends.

Acknowledgement:  The mobility of the author was facilitated by AKTION Austria–Czech Republic project No: 70p8.

References
Stloukal, P., Koutny, M., Sedlarik, V., Kucharczyk, P. Biodegradation of high molecular weight polylactic acid (2012) AIP Conference Proceedings, 1459 (1), pp. 20-22.
Kopčilová, M., Hubáčková, J., Růžička, J., Dvořáčková, M., Julinová, M., Koutný, M., Tomalová, M., Alexy, P., Bugaj, P., Filip, J. Biodegradability and Mechanical Properties of Poly(vinyl alcohol)-Based Blend Plastics Prepared Through Extrusion Method  (2013) Journal of Polymers and the Environment, 21 (1), pp. 88-94. Cited 1 time.
Stloukal, P., Jandak, J., Husarova, L., Koutny, M., Commereuc, S., Verney, V. Identification of several factors affecting biodegradation of aromatic-aliphatic copolyester (2010) International Conference on Development, Energy, Environment, Economics - Proceedings, pp. 118-121.

Starch filled PBAT incubated 20 days in soil. Parallel cracks along a bacterial filament are discernible. Stained with safranine, magnification 600×.

 

Prof. Dr. Marek Koutny … was born in Zlin, Czech Republic, studied Biochemistry at Masaryk University in Brno, Czech Republic, and later finished his Ph.D. dealing with electron transport chain of denitrifying bacteria the same institution under supervision of Prof. Igor Kucera. During his Ph.D. he also spend some time working at Free University of Amsterdam, Netherlands. In 1999 he obtained an assist. prof. position at Tomas Bata University in Zlin. In 2004-2005 he obtained and fulfilled a post doc fellowship at Blaise Pascal University in Clermont Ferrand, France, under supervision of prof. Anne-Marie Delort. In 2007 he obtained an assoc. prof. post at Tomas Bata University in Zlin. Among his interests are biodegradable polymers and polymeric materials, mechanism of biodegradation and microbiology of biodegradation.

 

Lecture at 10.45 a.m.: The influence of a hydrolysis-inhibiting additive on the degradation and biodegradation of PLA and its nanocomposites

 

Lecturer:

Dr. Petr Stloukal 
Tomas Bata University Zlin

Abstract:

PLA based materials can suffer from relative susceptibility of PLA towards hydrolysis. This could especially complicate thermoplastic processing of the materials because higher temperatures significantly increase the rate of hydrolytic reactions. Commercially available carbodiimide-based additive intended to stabilize PLA based materials against hydrolytic degradation were incorporated into a series of PLA and nanofiller containing PLA films.  The influence of the additive on the subsequent degradability of the materials was studied under the conditions of melt processing, biodegradation in compost and abiotic hydrolysis. Identical films without the additive were used as reference materials. Adding an anti-hydrolysis agent significantly retarded the decomposition of PLA in all the degradation processes tested. Both biodegradation and the abiotic hydrolysis of the PLA-based materials investigated were substantially retarded. This effect was much less pronounced in a material with organically modified montmorillonite.
Acknowledgments: The work was supported by AKTION Austria–Czech Republic (70p8).

Dr. Petr Stloukal was born in Zlin, Czech republic. He received a MSc in chemical engineering at the University of Chemistry and Technology in Prague and PhD in Polymers technology at the Thomas Bata Univerzity in Zlin. Since 2013 he has been working as Scientific-pedagogical staff at Tomas Bata Univerzity in Zlin in Centre of polymer systems and Department of Department in environment protection engineering. His research interests include Biodegradable polymers especially PLA and their applications in agriculture and environmental science.

 

Date: Wednesday, 25th March 2015, 10 a.m.

Location: Meetig room PCCL, Roseggerstrasse 12, 8700 Leoben (3rd level)

Vortragseinladung Prof. Ewa Wäckelgard am 3. Februar 2015

Lecturer:

Ewa Wäckelgard has PhD degree in Physics (1987) with specialization in materials physics. She is professor in solid state physics at Uppsala University from 2004 and also from 2007 in energy technology at Dalarna University. Her research interest is in materials optics with focus on coatings for solar absorbers for photo-thermal conversion. She has also research activities in energy systems studies and is programme director in a graduate school.

 

Title:

Development of solar absorbing surfaces - a review

 

Abstract:

Harvesting solar energy as heat is actively made in solar collectors with its main component, the solar absorber, with photo-thermal conversion. Absorbers can be designed in different ways but have in common the property to absorb most of the incoming solar radiation with lowest possible heat losses to the surrounding and to be chemically durable at high temperatures, to moisture and atmospheric pollutants.

The vast part of solar collectors are used for space heating and domestic hot water which means rather low temperatures, 50 to 100 °C in operation. It is also used in solar applications at higher temperatures, 300 to 500 °C (or even higher) for industrial pr0cesses and electricity generation.

The main focus in this presentation is to review the development in solar absorber development from the earlier processes of chemical and electrochemical conversion to physical and chemical vapour deposition, and later on sol gel and chemical solutions for dipping or spraying coatings.

 

Date: 3rd February 2015, 2 p.m.

Location: Meeting room PCCL, Roseggerstrasse 12, 8700 Leoben (3rd level)

 

 

Vortragseinladung Guido Panzarasa, M.Sc. am 2. Dezember 2014

Lecturer:

Guido Panzarasa, M.Sc., Department of Science and Technological Innovation, University of Eastern Piedmont "Amedeo Avogadro", Alessandria (Italy)

Guido Panzarasa was born in 1988. He obtained a B.Sc. in Materials Science in 2010  and a M.Sc. in Chemical Sciences in 2012 from the University of Eastern Piedmont "Amedeo Avogadro", Alessandira (Italy) working on the synthesis and characterization of core-shell silica nanoparticles for plasmonic and photonic applications. He started his PhD in 2012 in the same Insitution under the supervision of Dr. Katia Sparnacci, focusing on the realization of patterned, functional polymer brushes by means of controlled radical polymerization.

 

Titel:

Silicon Dioxide: a Playgrund for Nanotechnology and Surface Engineering

Abstract:

Since the seminal work of Stöber et al. [1] silica nanoparticles and functional siloxanes have become fundamental building blocks for the realization of complex structures on the nanoscale and for surface engineering by self-assembled monolayers (SAMs). Controlled synthesis of silica nanoparticles by sol-gel techniques, along with the major factors affecting diameter and monodispersity, the chemistries enabling introduction of functional groups and subsequent loading with pro-drugs, flourescent probes and noble metal nanoparticles for applications in drug delivery, photonics and plasmonics will be discussed thoroughly. The relevance of SAMs for smart coatings will be also highlighted by taking advantage of real case studies.

[1] W. Stöber, A. Fink, E. Bohn, Controlled Growth of Monodisperse Silica Spheres in the Micron Size Range, J. Colloid Interf. Sci. 1968, 26, 62 - 69.

 

Date: Tuesday, 2nd December 2014, 1 p.m.

Location: Meeting room PCCL, Roseggerstrasse 12, 8700 Leoben (3rd level)

 

 

 

 

WORKSHOP "Qualität und Zuverlässigkeit in der Photovoltaik" am 10.Dezember 2014

Datum: 10. Dezember 2014, 9:30 - 16:00 Uhr

Ort: Impulszentrum für Werkstoffe, 4. Stock, Roseggerstrasse 12, 8700 Leoben

 

Programm:

09:15 - 11:00 Uhr Begrüßung und Impulsvorträge

  • Begrüßung und Vorstellung der TPPV
  • Qualität und versicherte Garantie von PV Systemen
    Harry Wolkenfelt (Solar Insurance & Finance)
  • Thermomanagement von LEDs
    Stefan Deffregger (Materials Center Leoben)

11:00 - 11:30 Uhr Kaffeepause

11:30 - 13:00 Uhr Impulsvorträge

  • Alterung von Materialien für PV Module
    Karl Anders Weiss (Fraunhofer Institut für Solare Energiesysteme)
  • Zuverlässigkeit von PV Modulen
    Prof. Stefan Krauter (Photovoltaik Institut Berlin)

13:00 - 14:00 Uhr Mittagessen

14.00 - 16:00 Uhr Diskussion und Gruppenarbeit

  • Einleitung: Status Quo im Bereich des Qualitätsmanagements - Internationale Aktivitäten
    (IEA Task 13, IEC TC82, International PV Quality Assurance Task Force)
    Gernot Oreski
  • Gruppenarbeit
    • Qualitätsmanagement branchenübergreifend - gibt es Konzepte, die für unterschiedliche Branchen funktionieren könnten (Automobil, Halbleiter, LED)?
      Gerhard Peharz
    • PV Qualitätsmanagement - Wo steht die PV Branche im Moment und wohin soll es weitergehen (Erhöhung der Prozessstabilität; Wareneingangs- und Warenausgangskontrolle)?
      Christina Hirsch
  • Zusammenfassung der Diskussion

  

 

 

Um verbindliche Anmeldung bis zum 5. Dezember 2014 wird gebeten: Gernot Oreski (Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!)

Die Teilnahme ist für TPPV-Mitglieder kostenlos. Bei Verfügbarkeit freier Plätze können auch Nicht-TPPV-Mitglieder am Workshop teilnehmen (Kostenbeitrag: 100,00 EURO).

Vortragseinladung Dr. Anna Maria Coclite am 30.Oktober 2014

Lecturer:

Dr. Anna Maria Coclite is Assistant Professor at Institute for Solid State Physics, TU Graz

Abstract:

Well-adhered, conformal, thin (<100 nm) coatings obtained by Chemical Vapor Deposition (CVD) augment the capabilities of traditional surface modification techniques for different technological applications. Functional polymeric materials can be applied to virtually any substrate (organic, inorganic, rigid, flexible, planar, three-dimensional, dense or porous) at room temperature by CVD methods, In CVS polymerization, the monomer(s) are delivered to the surface through the vapor phase and then undergo simultaneous polymerization and thin film formation. By eliminating the need to dissolve macromolecules, CVD enables insoluble polymers to be coated and prevents solvent damage to the substrate. CVD film growth proceeds from the substrate up, allowing for interfacial engineering, real-time monitoring, and thickness control. Initiated-CVD has shown successful results in terms of rationally designed micro- and nano-engineered materials to control molecular interactions at material surfaces.

 

Date: Thursday, 30th October 2014, 3 p.m.

Location: Meeting room PCCL, Roseggerstrasse 12, 8700 Leoben (3rd level)

Vortragseinladung Prof. Debes Bhattacharyya am 9. September 2014

Titel: "Polymer blends and composites for biodegradable coronary stents and tissue scaffolds"

 

Lecturer: Professor Debes Bhattacharyya is a Distinguished Professor (holds a Personal Chair) in the Department of Mechanical Engineering and has been the founding Director of the Centre for Advanced Composite Materials (CACM) at the University of Auckland, since 2004. He also holds an Adjunct Professor position at Washington State University, Pullman, USA.  Professor Bhattacharyya was the Head of Mechanical Engineering Department from 1999 to early 2005.

His current research interest primarily includes the mechanics and manufacturing of composite materials. He has held visiting professorships/fellowships at various universities in Australia, Canada, Germany, Hong Kong and the US, and has been awarded a number of international fellowships and honours. He has delivered more than 50 keynote/plenary/invited lectures at different conferences and technical gatherings around the world and has served on the Editorial Advisory Boards of eight international journals and is the Associate Editor of J. of Nano and Smart Materials. Prof. Bhattacharyya has about 450 scientific/technical publications including several edited/authored books and a number of book chapters. He has successfully implemented several international patents. He is a Fellow of the Royal Society of NZ and a Distinguished Fellow of the Institution of Professional Engineers NZ. For his international academic achievements he has recently been awarded an honorary ‘Doctor of Engineering’ (honoris causa) by the University of Southern Queensland, Australia. In 2012, he was also awarded by IPENZ the Supreme Technical Award (John Cranko Award) for his professional and academic contributions in Mechanical & Manufacturing Engineering. 

Abstract:

In several branches of the medical field, from cardiology to orthopaedics to tissue engineering, there has been an increasing trend in the use of biodegradable materials in place of traditional, biostable materials, such as metals, ceramics and synthetic polymers. Biodegradable polymers and their composites are prominent in these areas and are of great interest for research because there is much room for improvement. This paper will focus on the application of polymer blends and composites in bioabsorbable stents and tissue scaffolds.

PLLA is very prominent in the field of bioabsorbable stents but it suffers from brittleness which must be mitigated. One method of doing this is to blend PLLA with rubbery polymers to create ductile blends which strike a balance between ductility, strength, modulus and degradation characteristics. This paper discusses the development of such blends and their mechanical characteristics, from Young´s modulus to creep, which occur during degradation.

PLLA is also a common material under investigation for tissue scaffolds. A large proportion of work in this area focuses on electrospinning to create tissue scaffolds but this requires the use of organic solvents. A process for producing scaffolds without the use of organic solvents has been developed at he Centre for Advanced Composite Materials, The University of Auckland. The process involves drawing of an extruded polymer composite filament to fibrilise the dispersed phase. After producing a network of micro-/nano-fibrils through a common manufacturing technique, the matrix is removed via dissolution in water, leaving a 3-D fibrillar, nanoporous network. This network can be used as a tissue scaffold with the advantage over electrospun networks of having no residual organic solvent content. This paper describes the process of scaffold manufacturing with some results of in-vitro cell culture.

 

 

Date: Tuesday, 9th September 2014, 2 - 4 p.m.

Location: Meeting room PCCL, Roseggerstrasse 12, 8700 Leoben

 

 

Vortragseinladung Prof. Debes Bhattacharyya am 8. September 2014

Titel: "Development, Manufacturing and Analysis of Advanced Composites: from Macro- to Nano-materials"

Lecturer: Professor Debes Bhattacharyya, distinguished Professor of Mechanical Engineering and Director of the Centre for Advanced Composite Materials, University of Auckland, New Zealand

Abstract:

The seminar will discuss some examples of research projects in the composites area and the challenge of keeping a balance between the fundamental research and more applied projects. It will also explore the possibilities of future research collaboration.

Although the composites research activities at the University of Auckland started in the late 1980´s, the Centre for Advanced Composite Materials (CACM) was formally established in 2002 with its own new building and laboratory being opened in 2004. CACM has been fortunate to be generously supported by the private and public funding agencies from both New Zealand and overseas (Australia, Germany, Japan, Norway, UK and USA).

CACM also has extensive collaborative relationships with many international research organisations and univerities, and is engaged in wide-ranging projects including:

• Development of micro-/nano-fibrillar composites from common polymer blends and their novel applications in manufacturing, packaging and biomedical areas;

• Nanocomposites with an introduction to multi-scale characterisation using microscopic image analysis and the usage of cellulosic materials;

• Computer simulation of knitting textile composites and their performance;

• Materials and process development for various manufacturing techniques including liquid composites moulding, rotational moulding, roll forming and machining. The projects involve both synthetic and natural fibres in both raw and modified

  forms.  The analyses are based on experimental, kinematic and numerical methods.

• Structural analysis for high-speed aquatic vehicles.

 

Date: Monday, 8th September 2014, 2 - 4 p.m.

Location: Meeting room PCCL, Roseggerstrasse 12, 8700 Leoben

 

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