Vpliv akrilatov na strukturo kopolimernih mrež akrilat/tiol

diplomsko delo univerzitetnega študijskega programa I. stopnje

Anja Raner (Author), Peter Krajnc (Mentor), Muzafera Paljevac (Co-mentor)

Abstract

V okviru diplomske naloge smo preučevali vpliv akrilatov, kot so 1,6-heksandiol diakrilat, divinil adipat, etilen glikol dimetakrilat, trimetilol propan triakrilat, na tvorbo poroznih kopolimernih materialov po principu tiol-en klik polimerizacije, z uporabo emulzij z visokim deležem notranje faze. Zanimalo nas je, kako se spreminjata struktura mrež in poroznost monolitov, glede na uporabo posameznega akrilata, ter kakšna je stabilnost emulzij. Pripravili smo HIP emulzije, pri katerih smo kot monomera s tiolnimi skupinami uporabili pentaeritritol tetrakis(3-merkatopropionat) oz. trimetilol propan tris(3-merkatopropionat) in kot akrilatne monomere z vinilnimi skupinami 1,6-heksandiol diakrilat, divinil adipat, etilen glikol dimetakrilat, trimetilol propan triakrilat. Pri pripravi emulzije z visokim deležem notranje faze smo variirali z uporabo različnih akrilatnih monomerov ter deleža vodne faze. Surfaktant (Pluronic L121) in iniciator (Irgacure 819) sta bila v primeru vseh emulzij enaka, enaki so bili tudi pogoji fotopolimerizacije ter hitrost mešanja emulzije. Rezultat so bile stabilne emulzije, ki po fotopolimerizaciji vse niso tvorile tipične poliHIPE strukture. Z vrstično elektronsko mikroskopijo smo preučili morfologijo vzorcev in v nekaterih primerih opazili pojav fazne inverzije. Materiale smo analizirali tudi z uporabo FTIR spektroskopije in elementne analize ter s pomočjo teh dveh metod preučili kemijsko sestavo monolitov, saj nas je zanimala vsebnost žvepla v vzorcu. Analiza nam je pokazala, da med teoretičnimi vrednostmi in vrednostmi pridobljenih z analizo, ne pride do bistvenih odstopanj. Opravili smo tudi analizo poroznosti po principu adsorpcije/desorpcije plina po BET metodi. S pomočjo masne bilance smo izračunali tudi izkoristek polimerizacije. Zanimalo nas je, zakaj je prišlo do fazne inverzije ter zakaj, kljub stabilnim emulzijam in uspešni polimerizaciji, nismo dobili tipičnih poliHIPE struktur.

Keywords

polimeri;emulzije;tiolen klik polimerizacija;poliHIPE;fazna inverzija;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[A. Raner]
UDC:	661.742.14:544.773.3(043.2)
COBISS:	21033750
Views:	977
Downloads:	205
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Acrylate effect on structure of acrylate/thiol copolymer networks
Secondary abstract:	In this diploma thesis we studied the influence of acrylates, such as 1,6-hexanediol diacrylate, divinil adipate, ethylene glycol dimethacrylate, trimethylol propane triacrylate, on the formation of porous copolymer materials according to the principle of thiol-ene click polymerization, using high internal phase emulsions. We have been interested in how the structure of networks and porosity of the monoliths is changing, depending on the use of individual acrylates, and whether the emulsions are stable. We prepared HIP emulsions in which we used different monomers, such as pentaerythritol tetrakis (3-mercatopropionate) and trimethylol propane tris (3-mercatopropionate) as a source of thiol, and the acrylic monomers with vinyl groups such as 1,6-hexanediol diacrylate, divinil adipate, ethylene glycol dimethacrylate and trimethylol propane triacrylate. During the preparation of the emulsions with a high internal phase we varied the volume of internal phase and studied how those changes affected the properties of the monoliths. Surfactant (Pluronic L121) and initiator (Irgacure 819) were the same in the case of all emulsions; the same were also the conditions of photo polymerisation and the mixing rate of the emulsion. The results were stable emulsions, which after photo polymerization, in all cases did not form a typical polyHIPE structures. Using line electron microscopy we studied the morphology of the samples, and in some cases we observed the phenomenon of phase inversion. The materials were also analysed using FTIR spectroscopy and elemental analysis, to study the chemical composition, because we were interested in the sulphur content in the sample. The analysis showed us that there are no significant deviations between the theoretical values and the values obtained from the analysis. We also analysed the porosity by determining specific surface by the BET method and with the use of mass balance, we calculated the yield of polymerization. We were interested in why phase inversion occurred, and why, despite stable emulsions and successful polymerization, we did not get a typical polyHIPE structures.
Secondary keywords:	polymers;HIP emulsions;thiol-ene click polymerization;polyHIPE;phase inversion;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	VIII, 39 str.
ID:	10859379