Development of molecularly imprinted polymers for capacitive sensors applications.

Postgraduate Thesis uoadl:1437667 380 Read counter

Κατεύθυνση Επιστήμη Πολυμερών και Εφαρμογές της
Library of the School of Science
Deposit date:
Spilioti Aikaterina
Supervisors info:
Ιατρού Ερμόλαος, Καθηγητής, Χημείας, ΕΚΠΑ
Σανοπούλου Μερόπη, Ερευνήτρια Α’, Ε.Κ.Ε.Φ.Ε. Δημόκριτος
Χατζηχρηστίδη Μαργαρίτα, Επίκουρη Καθηγήτρια, Χημικό, ΕΚΠΑ
Original Title:
Ανάπτυξη μοριακά αποτυπωμένων πολυμερών για εφαρμογές σε αισθητήρες χωρητικότητας.
Translated title:
Development of molecularly imprinted polymers for capacitive sensors applications.
One of the applications of the polymers is their use as sensing films in chemical gas sensors to detect volatile organic substances and moisture. However during operation in real, complex gaseous environments having low selectivity to mixtures of organic vapors and / or presence of moisture. A process for increasing the selectivity of the sorption of this gas analyzer is the "mapping" of the analyte molecule in the polymer matrix during the polymerization, so that the film which, will be deposited on the sensor has a permanent "memory" for that particular molecule. To stabilize the stent posts, the final polymer must be cross-linked, and the polymerization is carried out in the presence of the molecule, which will be imprinted, and then removed from the crosslinked polymer. In this work we attempted synthesis of molecularly imprinted polymers of styrene-divinylbenzene with molecular imprinting of the ethyl acetate molecule, based on the method of non-covalent interactions between the template and the functional monomers. After synthesizing various analogs of cross-linked polymers and after the ester removal they were characterized as to their (i) sorption capacity and (ii) morphology by SEM Based on the results, the skeletal density and the possible presence of porosity of the selected polymer, were determined by He pycnometry and N2 porosimetry, respectively. Then, various concentrations of the reticulated polymer granules were dispersed in commercial polystyrene solutions and examined in an optical microscope. The most suitable concentration was deposited on chemocapacitive gas sensors and tested for responses to gaseous ethyl acetate and moisture.
Main subject category:
radical polymerization, chemical gas sensors, non-covalent approach, styrene, Scanning Electron Microscopy
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