Functional Polymers
This is a modal window.
Das Video konnte nicht geladen werden, da entweder ein Server- oder Netzwerkfehler auftrat oder das Format nicht unterstützt wird.
Formale Metadaten
| Titel |
| |
| Serientitel | ||
| Anzahl der Teile | 163 | |
| Autor | ||
| Lizenz | CC-Namensnennung - keine Bearbeitung 4.0 International: Sie dürfen das Werk in unveränderter Form zu jedem legalen Zweck nutzen, vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen. | |
| Identifikatoren | 10.5446/50326 (DOI) | |
| Herausgeber | 05jdrrw50 (ROR) | |
| Erscheinungsjahr | ||
| Sprache |
Inhaltliche Metadaten
| Fachgebiet | ||
| Genre | ||
| Abstract |
| |
| Schlagwörter |
Beilstein TV138 / 163
16
20
31
43
44
47
51
57
67
78
102
105
112
131
135
138
139
140
144
145
146
149
150
151
154
157
159
160
161
162
163
00:00
Funktionelle GruppeBiosyntheseOrganische ChemieFunktionelle GruppePolymereSyntheseölBesprechung/Interview
00:16
PolymereStimulationChemischer ProzessReaktionsmechanismusFunktionelle GruppeBiosyntheseAlterungVerbundwerkstoffChemische EigenschaftBesprechung/Interview
00:47
Funktionelle GruppeVerbundwerkstoffBesprechung/Interview
01:02
Chemische EigenschaftMolekülChemischer ProzessWursthülleTankBesprechung/Interview
01:07
Schmidt-ReaktionChemischer ProzessWursthülleFunktionelle GruppeMolekülIsomerChemisches Experiment
01:21
FarbenindustrieChemische EigenschaftChemisches Experiment
01:38
Chemisches Experiment
01:44
Alkoholische LösungPolymereThermoformenMolekülChemischer ProzessGranulozytopoeseChemisches Experiment
01:49
ThermoformenMolekülAlkoholische Lösung
02:03
PolyurethaneChemischer ProzessPolymereNeotenieGletscherzungeChemisches Experiment
02:24
PolymerePolyolefineBesprechung/Interview
02:31
StickstoffatomGletscherzungeFunktionelle GruppeBesprechung/Interview
02:37
StickstoffatomChemisches Experiment
02:46
MetallElektronentransferAtomHyperpolarisierungChemische ReaktionSenseChemisches Experiment
02:54
PolymereMetallAtom-Transfer-PolymerisationChemischer ReaktorChemisches ExperimentBesprechung/Interview
03:07
Chemischer ReaktorChemische ReaktionPolymereStickstoffatomTransportInitiator <Chemie>Chemisches Experiment
03:19
OligomereBesprechung/Interview
03:24
Chemische ReaktionChemisches ExperimentBesprechung/Interview
03:31
PolymerePalmölindustrieSammler <Technik>MethanisierungBiosyntheseChemisches Experiment
03:39
PolymereBiosyntheseBesprechung/InterviewChemisches Experiment
03:48
MethanolPolymereSammler <Technik>PolyolefineVakuumverpackungRadioaktiver StoffChemisches Experiment
04:04
UltraviolettspektrumPolymereFarbenindustrieChemisches Experiment
04:18
ThermoformenIsomerFarbenindustrieWerkstoffkundeKaugummiBesprechung/Interview
04:24
PolymereWerkstoffkundeKaugummiChemische EigenschaftMinimale Hemmkonzentration
04:35
Besprechung/Interview
04:48
PolymereVerbundwerkstoffWerkstoffkundeFarbenindustrieSchubspannungBesprechung/Interview
Transkript: Englisch(automatisch erzeugt)
00:06
Hello and welcome to this podcast. My name is Anne Stauwitz and I'm an assistant professor at the Otto Diels Institute for Organic Chemistry here at Kiel University. My group is a synthetic polymer group and we are interested in the synthesis of functional polymers. You could also
00:22
call them smart polymers. Such polymers can respond to an external stimulus such as light or mechanical force by changing some of their properties reversibly. So as a synthetic group we are interested in how can we synthesize and modify such switches so we can put them into the backbone of
00:41
polymers. We're also interested in the switching process itself so how can the switching process still work if it's in a polymer material or composite material and of course we're interested in applications. So now my co-workers Dr. Jan Schmidt-Lassen and Jan Ole Springer will tell you a bit more about the projects that are ongoing in our group at the moment
01:02
within the Collaborative Research Center functioned by switching here at Kiel University. My name is Jan Schmidt-Lassen and I'm a postdoc in the Stauwitz group. My aim is to incorporate molecular switches, in my case spiral brains, into polymers. But let me first explain the switching process itself. The switching is an isomerization of the molecule which
01:24
can lead in a change of its properties and can result in the color change of the material. One possibility to trigger the switch is by UV light but let me first explain this in an example. These are spiral brains which my
01:40
colleague Matthias Schulze is doing research on and he wants to functionalize them efficiently and use them as on-off switches in semiconducting polymers. In the spiral brain form a solution of these molecules appears pink but when you shine light on it with a wavelength of 365 nanometers the solution turns purple. This is now the molecule and is
02:01
merosurine form. With white light you can switch it back so the whole process is reversible. But spiral brains have been built into the backbone of polymers. This has been pioneered by Nancy Sottos, Jeffrey Moore, Paul Brown and Scott White at the University of Illinois at Urbana-Champaign. You can use PMA, PMMA or polyurethane. Today we want to show you how we
02:26
synthesize a polyolefin polymer. Now we go to the glove box. Welcome, my name is Jan Ole Springer and I am a PhD student in the group of Anne Stauwels. We stand here in front of a glove box with a nitrogen
02:41
atmosphere. This glove box is used to work in an air and moisture free environment. Sensitive reagents can be stored and handled but even whole reactions can be prepared and performed inside the glove box. The polymerization we will show you today is an atom transfer radical
03:01
polymerization which is a metal catalyzed controlled radical polymerization. To transport our reaction vessel into the glove box we have to evacuate and flush it with nitrogen for 10 times to avoid bringing in any air into the glove box. For the P4VP polymer we use an initiator which
03:23
contains the switch and dissolve it in a solvent and the monomer. Within one hour the reaction will be finished. After one hour we can already see that we obtained a solid. This is our polymer and it is air stable so that it can be worked up and characterized outside of the glove box. After the
03:43
synthesis in the glove box we have to precipitate the polymer to remove any remaining impurities. For this polymer we use THF where the polymer dissolves well and we precipitate it into methanol. This is a poor solvent for the polymer. After collection and drying of the polymer in vacuum we obtain a
04:01
polyolefin polymer where a spiroprane is incorporated. These polymers can be switched by UV light and are therefore chromophores. In this pink polymer discs spiropranes are incorporated as switches into the backbone of the polymer chain. After irradiation the color turns into purple. The reason for the color change is again the isomerization from the spiroprane form
04:23
into the merosurine form. But furthermore you can also switch them when you bend or stress them like chewing gum. These materials are called mechanophores. Another aim that we have is to incorporate these polymers into composites. This we will do together with our collaboration partner
04:43
Professor Rainer Adelung at the technical faculty here at Kiel University. The idea is that by using the mechanophoric properties of the spiroprane containing polymers in composites we may be able to detect and locate the stress load inside the material by a color change. Such
05:01
self-reporting materials might be very interesting for the failure prediction in composites which at the moment is a very difficult problem to solve.