Synthesis of hypercrosslinked polymers in dispersed media

Abstract

[EN] The main goal of this project is to understand and adapt the Transfer-dominated Branching Radical Telomerization (TBRT) process to be able to work in a water-based system in order to minimize the use of volatile organic compounds (VOCs). To properly understand the TBRT process, experimental data obtained from solution polymerization has been compared with the data obtained from the simulations, and although the model follows the trends that occur, some improvements must be done to fully represent the real-life process. The transition from a solvent-based media to a water-based has been successful as it has been possible to perform the TBRT process in miniemulsion and by means of dispersible polymers, thus obtaining water dispersions. It has been proved that the TBRT process is capable of synthesizing hyperbranched polymers with high molecular weights but avoiding the formation of gel. The characterization of the polymers obtained from both the miniemulsion and dispersible polymers has been carried out by employing different techniques. The main conclusion has been that although the obtained polymer is capable of forming film and has a controllable molecular weight, as well as a really low gel content and a total vinyl bond conversion, some improvements must be done in order to employ them for certain applications.

[EU] Proiektu honen helburu nagusia “Transfer-dominated Branching Radical Telomerization” (TBRT) prozesua ulertzea eta hau uretan oinarritutako sistema batean lan egin ahal izateko egokitzea da, konposatu organiko lurrunkorren erabilera minimizatzeko. TBRT prozesua behar bezala ulertzeko, soluzioan egindako erreakzioetako datu esperimentalak simulazioetatik lortutakoekin alderatu dira, eta ereduko datuek esperimentalen joerei jarraitzen dien arren, hobekuntza batzuk egitea beharrezkoa da benetan gertatzen den prozesua ongi adierazi ahal izateko. Bestalde, esan beharra dago disolbatzaile organikotan oinarritutako ingurune batetik uretan oinarritutako ingurune batera trantsizioa egitea lortu dela; izan ere, TBRT prozesua miniemultsioan eta polimero dispertsagarri bidez egitea lortu da. Frogatu da TBRT prozesua gai dela pisu molekular handiko polimero hiperadarkatuak sintetizatzeko, baina gel-eraketa saihestuz. Miniemultsiotik zein polimero dispertsagarriekin lortutako polimeroen karakterizazioa hainbat teknika erabiliz egin da. Ateratako ondorio nagusiak izan dira lortutako polimeroak gai direla filmak sortzeko, pisu molekular kontrolagarria dutela, gel-eduki oso baxuak dituztela eta lotura binilikoen konbertsio totala lortu dela. Hala ere, hobekuntza batzuk egitea beharrezkoa dela ikusi da, hauek aplikazio jakin batzuetan erabili ahal izateko.