Priprava kopolimera etilenglikol-metakrilata i stirena

undergraduate thesis

• Title (english): Preparation of ethyleneglycol methacrylate and styrene copolymers
• Author: Jakov Sinti
• Mentor: Elvira Vidović (mentor)
• Committee member: Elvira Vidović (predsjednik povjerenstva)
• Committee member: Marijana Hranjec (član povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu sintetizirani su kopolimeri stirena i poli(etilenglikol)metileter-metakrilata (M-PEG) te su analizirana njihova svojstva. Sintetizirani je kopolimer
poli(stiren-kopoli( etilenglikol)metileter-metakrilat) (ST-ko-M-PEG) s različitim početnim molarnim udjelima monomera u reakcijskoj smjesi (S80/M20, S60/M40, S50/M50, S20/M80 gdje S označava stiren, a M M-PEG). Ukupne početne koncentracije monomera u reakcijskoj smjesi su 1 mol/dm^3. Kao inicijator korišten je tert-butil peroksi 2-etil heksanoat
(Trigonox 21) koncentracije 0,02 mol/dm^3. Za svaki sastav provedene su po dvije sinteze, jedna do nižih konverzija u trajanju 3 sata, a druga do visokih konverzija u trajanju 24 sata. Zbog bubrenja i geliranja polimera nije bilo moguće provesti sintezu u dilatometru do konverzija nižih od 10% pa nisu određivani omjeri reaktivnosti ni kinetika polimerizacije. Kvalitativni sastav nastalih polimera određen je FTIR tehnikom. Kopolimeri s dužim reakcijskim vremenom sadrže više stirena. Kopolimeri s više MPEG-a geliraju i zadržavaju otapalo pa se ti polimeri teško otapaju te zbog toga analiza NMR i GPC tehnikama nije bila moguća. Toplinska svojstva priređenih kopolimera ispitana su diferencijalnom pretražnom kalorimetrijom (DSC). Entalpije kristalizacije i taljenja rastu s porastom udjela M-PEG-a.

Abstract (english)

In this study, copolymers of styrene and poly(ethylene glycol)methyl ether methacrylate (MPEG) were synthesized and their properties were analyzed. Copolymer
poly (styrene-copoly( ethylene glycol)methyl ether methacrylate) (ST-co-M-PEG) was synthesized with initial molar ratios of monomers in the reaction mixture (S80/M20, S60/M40, S50/M50, S20/M80 where S is styrene and M is M-PEG). Total monomer concentration in all mixtures is 1 mol/dm^3. Tert-butyl peroxy 2-ethyl-hexanoate (Trigonox 21) was used as initiator. Two syntheses were performed for each ratio, one to lower conversions lasting
3 hours and the other to high conversions lasting 24 hours. Due to the swelling and gelation of the polymer, it was not possible to do the synthesis in the dilatometer to conversions lower than 10% and because of that copolymerization reactivity ratios could not be determined. Composition of the polymer was determined by FTIR infra-red technique. Copolymers with longer reaction time contain more sryrene. Copolymers with more ethylene glycol methacrylate form a gel and retain the solvent, and because of that these polymers are difficult to dissolve, therefore analysis by NMR and GPC techniques was not possible. Thermal properties of synthesized copolymers were determined with differential scanning calorimetry (DSC). Copolymers with more M-PEG have higher enthalpies of crystallization and melting.

• Keywords: kopolimerizacija; kopolimeri; stiren; poli(etilenglikol)metileter-metakrilat
• Keywords (english): copolymerization; copolymers; styrene; poly(ethylene glycol)methyl ether methacrylate
• Language: croatian
• URN:NBN: urn:nbn:hr:149:007989
• Study programme: Title: Chemical 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: 2023-05-08 15:08:32