Ekstrakcija polisiloksanskih gelova - utjecaj vrste otapala

undergraduate thesis

• Title (english): Extraction of polysiloxane gels - solvent effect
• Author: Marija Fucak
• Mentor: Danijela Ašperger (mentor)
• Committee member: Danijela Ašperger (predsjednik povjerenstva)
• Committee member: Emi Govorčin Bajsić (član povjerenstva)
• Committee member: Irina Pucić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Analytic Chemistry

Abstract

Polisiloksani su polimeri koji sadrže [SiRR'O] ponavljajuće jedinice. Najčešće su proučavani članovi siloksanske skupine spojeva i daleko su najznačajniji s obzirom na komercijalnu primjenu. Cilj ovog rada je provedbom ekstrakcije istražiti i odrediti utjecaj vrste otapala koje se nalazi u gelu na stabilnost polisiloksanskog gela. Istraživani su PDMS-TAEA gelovi priređeni reakcijom poli(dimetil-siloksan) diglicidil etera (PDMS-DGE) s tris(2-aminoetil)aminom (TAEA), bez i s dodatkom odabranih otapala klorbenzena, etanola, benzena, t-butanola, izo-propanola te smjese otapala klorbenzena i etanola odnosno klorbenzena i t-butanola. Ekstrakcija je provedena u n-heksanu na 2 načina: stacionarno osam tjedana na temperaturi od 50 °C i metodom po Soxhlet-u u trajanju 24 sata. Gubitci mase pri stacionarnoj ekstrakciji bili su veći u odnosu na ekstrakciju po Soxhlet-u što možemo pripisati djelomičnom otapanju gela zbog dugotrajnog procesa stacionarne ekstrakcije. Najmanji gubitak mase obim metodama ekstrakcije opažen je kod gela koji u sebi nije sadržavao otapalo.

Abstract (english)

Polysiloxanes are polymers that contain [SiRR'O] repeating units. They are the most studied members of the siloxane group of compounds by far and are the most significant with regard to commercial application. The goal of this study was to research the influence of solvent the polysiloxane gel contained on its stability by extraction analysis. PDMS-TAEA gels were prepared by reaction of poly(dimethylsiloxane) diglycidyl ether (PDMS-DGE) with tris (2-aminoethyl) amine (TAEA) without and with the addition of selected solvents and solvent mixtures chlorobenzene, ethanol, benzene, t-butanol, iso-propanol and mixtures of chlorobenzene and ethanol and chlorobenzene and t-butanol. The extraction was performed in n-hexane in 2 modes: stationary for eight weeks at 50 °C and by Soxhlet method for 24 hours. The decrease of mass was higher for stationary extraction compared to Soxhlet extraction that can be attributed to the partial dissolution during the long-lasting stationary process. The least mass loss by any extraction method was observed in a gel that contained no solvent.

• Keywords: polisiloksan; tris(2-aminoetil)amin; otapalo; stacionarna ekstrakcije; Soxhlet ekstrakcija
• Keywords (english): polysiloxane; tris(2-aminoethyl)amine; solvent; stationary extraction method; Soxhlet extraction
• Language: croatian
• URN:NBN: urn:nbn:hr:149:263334
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-10 11:29:43