Functional Polymers

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Video in TIB AV-Portal: Functional Polymers

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Functional Polymers
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This video deals with the synthesis of functional or “smart”polymers. These interesting polymers respond to an external stimulus by changing their properties reversibly. Such stimuli can be for example light or mechanical force. Such polymers can be used for interesting applications, which are investigated within the Collaborative Research Center 677, which is called “Function by switching”, at Kiel University
Keywords supramolecules polymers
Biosynthesis Synthetic oil Organische Chemie Functional group Functional group Polymer
Composite material Ageing Functional group Chemical property Stimulus (physiology) Polymer Process (computing)
Molecule Schmidt reaction Chemical experiment Chemical property Storage tank Wursthülle Process (computing)
Chemical experiment Colourant
Molecule Bone marrow Chemical experiment Solution Thermoforming Process (computing)
Neoteny Chemical experiment Polymer Ice front
Sense District Metal Hyperpolarisierung Chemical experiment Elektronentransfer Chemical reaction Atom
Chemical reactor Stickstoffatom Chemical experiment Transport Polymer Chemical reaction
Chemical experiment
Chemical experiment
Biosynthesis Collecting Methanisierung Chemical experiment Polymer Palmölindustrie
Chemical experiment Polymer Radioactive decay Vakuumverpackung
Chemical experiment
Chewing gum Materials science Thermoforming
Chemical property Minimale Hemmkonzentration
Materials science Colourant
hello and welcome to this podcast my name is an issue now woods and i'm an assistant professor at the ought to use in situ to organic chemistry here at keele university might prove a synthetic polymers group and we're interested in the synthesis of functional palomas you can also call them small part of us such columnists can respond.
to an external stimulus such a slight a mechanical force but changing some of the properties reverse simply so as a synthetic group were interested in how can we synthesize and modify such which is so we can put them into the backbone of palomas we also interested in the switching process itself so how come to 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 talk to young age would lessen and john all his player will tell you a bit more about the projects that are ongoing in our group at the moment within the collaborative to research center function by switching.
here at university my name is george would lessen and i'm a poll sport in the store with school my aim is to incorporate molecular switches in my case broke trains into palomas but let me first explain the switching process itself to switching is in our summers asian of the molecule which can be used in a change of his property.
use and can result in the color change of the material one possibility to all trigger this which is by u.v. light but let me first explain this in an example this aspire prince which my colleague mathias was just doing research on and he wants to function lies them efficiently and use.
with them as on off switch is insane conducting columnist in despair of print form a solution office molecules appears peak but when you shine light on it with the way things are three hundred sixty five nanometers the solution turns purple this is now the molecule and his marrow sunni form with white light you can switch it back so the whole process is true.
possible. but spoke brains have been built into the backbone of palomas this has been pioneered by nancy sort also jeffrey more pork brown and squat white at the university of illinois at urbana champagne. you can use p.m. a p m a whole point is you were thing today we want to show you how we synthesize apollo finn polymer now we go to the glovebox welcome my name of young wolfgang a and i am a ph d. student in the group of on a starbucks we stand here in front of a black box.
with the nitrogen atmosphere this black boxes used to work in an at and moisture free environment.
sense to free agents can be stored and handled but even whole reactions can be prepared and performed inside the glovebox the polarization we will show you today is an atom transfer radical put him as a nation which is a metal catalyzed controlled ready to pull him as a nation.
for transport or reaction vessel into the draft course we have to evacuate and flush with nitrogen for ten times to avoid bringing in any at into the glove box. for the p for v.p. polymer we use and initiator which contains the switch and does all that in a solvent and the monument 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 estimated will so that it.
can be worked out and characterized outside of the glove box after the synthesis in the glove box we have to precipitate the palm oil to remove any remaining impurities for this problem though we used to h f with the polymer to soar spell and three percent the tate into methane or this is a porcelain for the pollen after collection and drying off the.
pullman vacuum we obtain a pulley all if in parliament with spare brains incorporated these pulling this can we switch by u.v. light and therefore come a force in this thing parliament despite prince are incorporated as which is of the backbone of the polymer chain after the radiation to collect turns into purple the reason for the.
that change is again as maras asian from the spire print form and to them or us union form but furthermore you can also switched them when you bend or stressed them like chewing gum these materials are called become a force.
another time that we have is to incorporate these palomas into compensates this rule do together with our collaboration partner professor i'm alone at the technical faculty here at keele university the idea is that by using the mic can afford properties of despair up around contending palomas in compass its.
we may be able to detect and located to stress load inside the material by a color change such self-supporting materials might be very interesting for the failure protection in compass its which at the moment is a very difficult problem to solve.