MALDI-TOF masa-espektrometriaren erabilera polimeroak ezaugarritzeko

Abstract

Gaur egun, materialak ezaugarritzekoerabiltzen diren teknikek informazio dezente uz-ten dute agerian, baina oraindik nahiko zaila da egiturari buruzko informazio osatua lortzea. Informazio hau garrantzi handikoa eta beharrezkoa da modu sakon batean polimero horietatik eratorritako materia-len propietateak ezagutzeko. Polimeroak karakterizatzeko, Matrix Assisted Laser Desorption-Ionization Time of Flight Mass Spectrometry (MALDI/TOF MS) sortu zenetik, gero eta gehiago hedatu da teknika honen erabilera arlo desberdinetan.Masa-espektrometria teknika hau hedatu egin da polimeroen karakterizazioan, masa molarraren bana-ketaz gain, polimeroen unitate monomerikoa, polisakabanatzea eta kateen muturrak ezagutzea lor daite-keelako, hain zuzen ere.Lan honetan MALDI/TOF teknikaren oinarriak labur azalduko dira: masa espektrometroak nola fun-tzionatzen duen, zein den matrizearen garrantzia, zeintzuk diren matrize ohikoenak... Eta zenbait poli-meroren karakterizazio adibideak aztertuko dira. Zehazki, bi karakterizazio-prozedura erakutsiko dira: Gel Permeation Chromatography (GPC) teknikan estandartzat erabiltzen den poliestireno homopolime-roa eta Latemul, emultsionatzaile polimerizagarri komertzial moduan erabiltzen den kopolimeroa.; Nowadays, techniques used for materials characterization provide a lot of information, but it is difficult to obtain complete information about structure. This information is very important and it is required to know more about the obtained material properties by these polymers. For polymers characterization, since Matrix Assisted Laser Desorption-Ionization Time of Flight Mass Spectrometry (MALDI/TOF MS) was developed, the use of this technique in different fields has increased exponen-tially.This mass spectrometry technique has spread for polymers characterization and, besides molar mass distribution, polymer monomeric units, polydispersity and end-groups can also be obtained.In this work, MALDI/TOF fundamentals are briefly explained: how mass spectrometer works, what is the importance of the matrix, which are the typical matrices... And some polymer characterization illus-trative examples will be presented. Specifically, twocharacterization processes will be shown: polysty-rene homopolymer used as a standard in Gel Permeation Chromatography (GPC) technique and Latemul, a comercial copolymer used as polymerizable emulsifier.