Porous polyhipe membranes by thiol-ene polymerization
| Autor: | German, Sanela |
|---|---|
| Přispěvatelé: | Krajnc, Peter |
| Jazyk: | slovinština |
| Rok vydání: | 2017 |
| Předmět: |
pentaerythritol tetrakis (3-mercaptopropionate)
porous polymers porozni polimeri pentaeritritol tetrakis (3-merkaptopropionat) emulzije z visokim deležem notranje faze high internal phase emulsions trimethylolpropane triacrylate trimetilolpropan triaktilat tiol-en polimerizacija thiol-ene polymerisation poliHIPE materiali polyHIPE materials membrana membrane udc:665.652.2(043.2) |
| Zdroj: | Maribor |
| Popis: | Diplomsko delo prikazuje študijo, s katero smo želeli z uporabo dveh različnih monomerov, pentaeritritola tetrakisa (3-merkaptopropionat) (TT) in trimetilolpropana triaktilata (TMPTA), pripraviti polimerne membrane z ustrezno poroznostjo in morfologijo, ki bi lahko nadalje služile različnim aplikacijam. Sinteze smo se lotili s postopkom fotopolimerizacije kontinuirne faze emulzij z visokim deležem interne faze (HIP-emulzije). Kontinuirno fazo je v našem primeru predstavljala mešanica monomerov, interno fazo pa vodna raztopina kalcijevega heksahidrata. HIP emulzije, ki so se skozi celoten čas mešanja, pri 200 obr/min, nahajale v vodni kopeli, s konstantno temperaturo 21 °C, smo pripravili v treh različnih razmerjih med monomeroma (TT : TMPTA) in sicer 1 : 1, 1 : 2 in 1 : 4. Končne produkte smo po uspešni sintezi okarakterizirali s pomočjo infrardeče spektroskopije, z elementno analizo, DMA testi in z uporabo vrstičnega elektronskega mikroskopa (SEM analiza). V okviru diplomske naloge smo pripravili membrane z odprto celično strukturo in z infrardečo spektroskopijo pričakovano potrdili enako kemijsko sestavo pri vseh vzorcih. Hkrati smo zaključili, da spreminjanje razmerij med monomeroma vpliva na morfologijo končnega produkta in njegove mehanske lastnosti. Membrane so z višanjem razmerja TT : TMPTA pridobivale tipično porozno poliHIPE strukturo, medtem ko se je njihova elastičnost zmanjšala. The diploma thesis presents our study in which we wanted with the use of two different monomers, pentaerythritol tetrakis (3-mercaptopropionate) (TT) and trimethylolpropane triacrylate (TMPTA), to prepare polymeric membranes with adequate porosity and morphology that could possibly serve for various applications. We achieved the synthesis with the photopolymerisation procedure of the continuous phase with a high internal phase emulsions (HIP-emulsion). In our case, a mixture of monomers represented a continuous phase while the internal phase was the aqueous solution of calcium hexahydrate. HIP emulsions, which were mixed at 200 rpm/min over the entire time, were placed in a water bath with a constant temperature of 21 degrees Celsius, were prepared in three different ratios of monomers (TT : TMPTA) 1 : 1, 1 : 2 and 1 : 4. After the successful synthesis, we characterized the final products by using infrared spectroscopy, analysis of the composition of elements and compounds, DMA tests and by scanning electron microscope (SEM analysis). In the context of our diploma thesis, we prepared membranes with an open-cell structure. As expected, we confirmed the same chemical composition in all of the samples. At the same time as proven by the results, we concluded that the change in the relationships between monomers affects the morphology of the final product and its mechanical properties. The membranes acquired typical porous polyHIPE structure by increasing the ratio of TT : TMPTA, while their elasticity decreased. |
| Databáze: | OpenAIRE |
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