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Singing at the CTO

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16th October 2017: Teambuilding - Singtar evening Verena was so kind and organized a further teamevent ...  mehr zu Singing at the CTO (Titel)

Next step in life

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24th October 2017: Time to say goodbye Our colleague Paul successfully celebrated ...  mehr zu Next step in life (Titel)

WCCE 2017, Barcelona, Spain

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1st-5th October 2017: 10th World Congress of Chemical Engineering, Barcelona, Spain Patricia and Andreas were lucky to attend ...  mehr zu WCCE 2017, Barcelona, Spain (Titel)

Chemie Tage 2017, Salzburg, Austria

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25th-28th September 2017: 17th Austrian Chemistry Days, Salzburg, Austria Our institute was well represented at this year’s ...  mehr zu Chemie Tage 2017, Salzburg, Austria (Titel)

PDDG 2017, Toarmina, Italy

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3rd-7th Sepember 2017: 32nd Polymer Degradation Discussion Group conference, Toarmina, Italy Our college Sandra visited the ...  mehr zu PDDG 2017, Toarmina, Italy (Titel)

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- Preparation of flame resistant polymers (Dr. Manuela List)

Polyethylene is the most widely used plastic in the world. The properties of polyethylene can be modified and enhanced by copolymerization with higher ɑ-olefines. The most important ones are butene (C4), hexene (C6) and octene (C8). Ethylene can also be copolymerized with a wide range of non-olefinic monomers. Common examples are ethylene-vinyl-acetate copolymer (EVA) and different ethylene-acrylate copolymers.
A method to increase the flame resistance of polyolefines is the addition of nitrogen compounds (e.g. melamine, melamine-cyanurate, trihydrazinotriazine, etc.), halogen compounds or inorganic fillers. In most cases these compounds are added after the polymerization process to the polymer. However, this may lead to problems (e.g. melamine partly migrates to the surface; melamine-cyanurate tends to sublime and foam the polymer; etc.).

The research group’s interest is focused on the incorporation of different nitrogen based heterocyclic systems (e.g. melamine based materials, imidazole derivatives,…) primarily with ethylene via copolymerization to circumvent the above mentioned problems. Not only the copolymerization with ethylene has to be tested, also ionic- and radical polymerization with e.g. styrene, different acrylates will be investigated.
Depending on the used monomers, basic polymerization parameters such as the type of catalyst, concentrations of reactants, temperature, solvent, reaction time, and the way of adding the nitrogen compound are studied and optimized.

Another important field of research is the characterization of these novel products. For this purpose a wide variety of analysis methods are used (elemental analysis, IR-, and Raman spectroscopy, DSC, TGA, pyrolysis-GC/MS, GPC, Maldi-Tof,…).

Pyrolysis-GC/MS of a tetramethyldivinylmelamine-ethylene-copolymer

Furthermore, the copolymers are evaluated with the respect to their flame resistance and their mechanical properties.

Flame resistance of polyethylene and different ethylene-vinylmelamine copolymers