Kopolimerizacijska reaktivnost 2-(tert-butilamino)etil metakrilata

master's thesis

• Title (english): Copolymerization reactivity of 2-(tert-butylamino)ethyl methacrylate
• Author: Rea Veseli
• Mentor: Ante Jukić (mentor)
• Committee member: Ante Jukić (predsjednik povjerenstva)
• Committee member: Marko Rogošić (član povjerenstva)
• Committee member: Fabio Faraguna (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

U ovom radu se istraživala kopolimerizacijska reaktivnost 2-(tert-butilamino) etil metakrilata (TBAEMA) u procesima radikalske kopolimerizacije do niskih masenih konverzija (<10 %) s metil-metakrilatom (MMA), stirenom (ST) i oktadecil-metakrilatom (ODMA). Svaki sustav kopolimeriziran je u različitim sastavima, odnosno različitih molnih udjela monomera (90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80 i 10/90). Dobiveni kopolimeri karakterizirani su različitim metodama te im je određen sastav pomoću 1H nuklearne magnetske rezonancijske spektroskopije, zatim su određeni fazni prijelazi diferencijalnom skenirajućom kalorimetrijom, toplinska stabilnost termogravimetrijom te raspodjela molekulskih masa kromatografijom na propusnom gelu. Omjeri kopolimerizacijskih reaktivnosti monomera izračunati su različitim linearnim (Finneman-Ross, invertirana Finneman-Ross, Kelen-Tüdős i proširena Kelen-Tüdős) metodama i nelineranom Tidwell-Mortimerovom metodom. Dobivene vrijednosti za r1 i r2 za MMA-TBAEMA sustav su približno jednaki jedinici, što ukazuje na idealnu kopolimerizaciju dok su kod ostalih uočena malo veća odstupanja – ST-TBAEMA ima vrijednosti uglavnom manje od jedan, dok ODMA-TBAEMA veće od jedan te upućuju na neidealnu azeotropnu kopolimerizaciju. Uočeno je negativno djelovanje TBAEMA na toplinsku stabilnost kopolimera, kao i snižavanje staklišta s obzirom da homopolimer ima razmjerno nisku temperaturu staklastog prijelaza u odnosu na ostale homopolimere. Kromatografija na propusnom gelu za određivanje raspodjele molekulskih masa neuspješna je u smislu nedostatka dobrog signala od TBAEMA.

Abstract (english)

This paper studies the copolymerization reactivity of 2-(tert-butylamino)ethyl methacrylate (TBAEMA) through the low mass conversion (<10%) radical copolymerization with methyl methacrylate (MMA), styrene (ST) and octadecyl methacrylate (ODMA). Each system is copolymerized in different compositions, i.e. with different molar ratios of monomers (90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80 and 10/90). The resulting copolymers were characterized by different methods: the composition was determined by 1H nuclear magnetic resonance spectroscopy, the phase transitions with differential scanning calorimetry, thermal stability by thermogravimetry and distribution of molecular mass by gel permeation chromatography. The copolymerization reactivity coefficients of monomers were calculated with different linear (Finneman-Ross, inverted Finneman-Ross, Kelen-Tüdős and extended Kelen-Tüdős) methods and non-linear Tidwell-Mortimer method. The obtained values for r1 and r2 for the MMA-TBAEMA system are approximately equal to 1, indicating ideal copolymerisation while others have slight deviations – ST-TBAEMA has values mostly less than 1, while ODMA-TBAEMA has mostly values above 1 and that indicates to non-ideal azeotropic copolymerization. A negative effect of TBAEMA on the thermal stability of other monomers was noted as well as lowering of the glass transition temperature as TBAEMA has a relatively low glass transition temperature relative to the other monomers. Gel permeation chromatography for the analysis of molecular mass distribution was unsuccessful in the sense of the absence of a good signal from TBAEMA.

• Keywords: 2-(tert-butilamino) etil metakrilat; kopolimeri; omjeri kopolimerizacijske reaktivnosti; karakterizacija kopolimera
• Keywords (english): 2-(tert-butylamino)ethyl methacrylate; copolymers; copolymerization reactivity ratios; characterization of copolymers
• Language: croatian
• URN:NBN: urn:nbn:hr:149:078262
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-11-03 09:30:27