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 Lecture of Institute guest

 

Educational and Information Centre of the Institute of Macromolecular Chemistry AS CR, v. v. i.

invites you to

a lecture of an Institute guest

Lecturer:

Jelena Pavličević

(University of Novi Sad, Faculty of Technology Novi Sad)

Topic:

Polycarbonate-based polyurethane nanocomposites: Synthesis and characterization

All aliphatic starting reactants were used to prepare two series of polycarbonate-based polyurethane (PC-PU) composite films: 1) with a low amount of titanium dioxide nanoparticles (0.5, 1.0 and 2.0 wt%) by one-step technique and 2) PC-PU hybrid materials by addition of submicron amorphous SiO2 Sidistar T120 particles (0, 1, 2, 5 and 10 wt%) using prepolymerization method. The study of the influence of different filler distribution on the structure of obtained elastomers composites was performed using FT-IR, SEM and AFM. TGA analysis was carried out to investigate the effect of inorganic fillers on thermal stability and degradation of synthesized PC-PU materials. The impact of silica and titania on the glass transition temperature and melting of obtained polyurethane systems was studied by DSC and MDSC. Tensile testing was carried out to determine the influence of fillers on the mechanical properties of PC-PU hybrids. Based on obtained results, the synthesized polyurethane materials showed improved thermal stability and enhanced thermal and mechanical properties.

When and where:

Monday 6.5.2019 ve 13:00 in lecture room A

 Lecture of the lecture cycle

 

Educational and Information Centre of the Institute of Macromolecular Chemistry AS CR, v. v. i.

invites you to

a lecture of the Institute lecture cycle

Lecturer:

Verena Giel, Ph.D.

(Institute of Macromolecular Chemistry AS CR, v. v. i.,)

Topic:

Novel materials for membrane gas separation

The implementation of polymer membranes in gas separation applications has been investigated to a great extent. Nevertheless, only a few types of polymers are used in commercial applications, disclosing the need for new materials with superior membrane performance to make membrane processes a more competitive technology over the conventional ones. Based on this context, this work focuses on the development of new polymeric membranes. Polyaniline (PANI), a multifaceted polymer that can change its structural properties upon various modification procedures, was chosen as membrane material. PANI membranes possess attractive O2/N2 selectivities, wherefore it is an interesting candidate for the use in gas separation applications, such as generation of oxygen-enriched air or inert gas generation. However, membranes made from neat PANI are suffering from brittleness and thus create leak paths through the membrane. Therefore PANI was blended with polybenzimidazole (PBI), a temperature stable polymer with good film-forming properties facilitating the preparation of thin, stable polymer films. Furthermore, several techniques were investigated including acid-doping, thermal treatment, and addition of titanate nanotubes (TiNTs) to enhance the separation properties. The materials that have been prepared are: 1) undoped PANI/PBI blend membranes, 2) doped PANI/PBI blend membranes, 3) thermally treated undoped and doped PANI/PBI blend membranes, and 4) undoped PANI/PBI-TiNT mixed matrix membranes (MMMs). Each material was characterized for its morphological, mechanical, and physico-chemical properties. Furthermore, gas permeation and sorption measurements were carried out on a time-lag permeation apparatus and a gravimetric sorption balance for the gases H2, O2, N2, CH4, and CO2 in order to investigate the gas separation behavior and to find out which membrane material possesses enhanced gas transport properties. The effect of the amount of PANI inside the PBI matrix, acid-doping, thermal treatment, and TiNT content was systematically investigated in relation to the gas permeation performance of the membranes. Furthermore, the membrane performance of each material was estimated with existing models as a means of interpretation of the experimental data and in order to figure out which membrane properties are good for a required membrane process. The results acquired during this study provided a fundamental understanding of the structure-property relationship and revealed that the composition and the modification procedure is of great importance for the membrane separation properties. Further research to optimize the membrane preparation conditions and to modify the membrane structure is needed to improve the separation performance for industrial applications.

When and where:

Friday 26.4.2019 ve 9:00 in club B

The lecture is obligatory for PhD students.


(Created on 22.4.2019 from the data modified on 8.4.2019)

Otto Wichterle Centre of Polymer Materials and Technologies - CPMTOW

Centre of Biomedicinal Polymers - CBMP

Centre of Polymer Sensors - CPS

Polymers for Power Engineering - Energolab


Institute of Macromolecular Chemistry CAS

Heyrovského nám. 2
162 06 Prague 6
Czech Republic
tel:+420 296 809 111
fax:+420 296 809 410

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