Priprava hierarhično poroznih materialov iz multiplih šablon

magistrsko delo

Azra Osmič (Author), Peter Krajnc (Mentor), Muzafera Paljevac (Co-mentor)

Abstract

V magistrski nalogi smo sintetizirali porozne polimerne materiale s tehniko sintranja poli(metil metakrilatnih) (PMMA) zrn. Sintrana PMMA zrna smo uporabili kot osnovo za kalup za polimerizacijo emulzij z visokim deležem notranje faze, kateri je sledila polimerizacija. Tako pripravljen material smo nato čistili v Soxhletovem aparatu v ustreznem topilu. Ta korak nam je omogočil odstranitev PMMA zrn in s tem nastanek porozne strukture. PMMA zrnom smo z vrstičnim elektronskim mikroskopom določili premere in dobili velikostno porazdelitev. Zrna smo sintrali pri temperaturi 180 ˚C 24 h. Za dosego enakomerne razporeditve polimernih zrn v kalupu smo jih predhodno stresali. Kot monomere smo uporabilil divinil adipat (DVA) in 2-hidroksietil metakrilat (HEMA). Izvajali smo polimerizacijo kontinurine faze emulzije z visokim deležem notranje faze (HIP emulzije), in sicer termično v pečici in s fotopolimerizacijo v UV komori. Po polimerizaciji smo materiale čistili v Soxhletovem aparatu. Osnovne monolite (polimerizirana emulzija brez uporabe sintranega nosilca) smo čistili 24 h v izopropanolu, nosilce (polimerizirana emulzija z uporabo sintranega nosilca) pa 24 h v etilacetatu in 24 h v etanolu. Končne produkte smo okarakterizirali z vrstičnim elektronskim mikroskopom, Fourierjevo transformacijsko infrardečo mikroskopijo ter adsorpcijskim porozimetrom. Vzorce brez uporabe sintranih PMMA zrn smo uspešno sintetizirali za oba sistema, poli(DVA) in poli(HEMA-ko-MBAA). Pri sintezi materiala z uporabo sintranega nosilca pa smo uspeli sintetizirati poli(DVA) le s fotopolimerizacijo, medtem ko smo poli(HEMA-ko-MBAA) material dobili tako s fotopolimerizacijo kot tudi s termično polimerizacijo.

Keywords

polimerizacija;sintranje;porozni polimeri;poliHIPE;HIP emulzije;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2018
Typology:	2.09 - Master's Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[A. Osmić]
UDC:	66.095.26:544.773.3(043.2)
COBISS:	21924118
Views:	852
Downloads:	159
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Preparation of a hierarchical porous materials from multiple templates
Secondary abstract:	The main objective of the dissertation is the synthesis of porous poly materials by sintering poly (methyl methacrylate) (PMMA) beads. Sintered PMMA beads were used as mould basis for emulsion polymerisation with high internal phase, followed by polymerisation. Material prepared in this way was later cleaned in the Soxhlet apparatus in the suitable solvent. This step enabled the removal of PMMA beads and achieved a porous structure. The diameter of PMMA beads was specified with a scanning electron microscope, which determined their size distribution. The process of sintering occurred at 180 ˚C for 24 h. In order to achieve a more even distribution of poly beads in the mould, they had to be shaken beforehand. 2-hydroxyenthyl methacrylate (HEMA) and divinyl adipate (DVA) were used as monomers. The polymerisation of the continuous phase of high internal phase emulsion (HIP emulsion) was carried out thermically in the oven and with photopolymerisation in the UV chamber. After polymerisation, the material was cleaned in the Soxhlet apparatus. Simple monoliths (emulsion polymerisation without the use of sintered templates) were cleaned in isopropanol for 24 h, the templates (emulsion polymerisation with the use of sintered templates) in ethyl acetate for 24 h and in ethanol for 24 h. Final products were characterised with a scanning electron microscope, the Fourier transform infrared spectroscopy and a porosimeter. Samples without the use of sintered PMMA beads were successfully synthesized for both systems, poly(DVA) and poly(HEMA-ko-MBAA). When synthesizing material with the use of a sintered template, poly(DVA) could only be sintered with photopolymerisation. On the other hand, poly(HEMA-ko-MBAA) material was obtained with photopolymerisation, as well as thermic polymerisation.
Secondary keywords:	polymerization;sintering;porous polymers;HIP emulsions;
URN:	URN:SI:UM:
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	XII, 51 str.
ID:	10978539