Vpliv topila na učinkovitost samoceljenja epoksi materiala z Diels-Alder komponentami

Horvat, Miha (avtor), Ručigaj, Aleš (mentor)

Materiali na osnovi epoksi smol so pomembna skupina materialov, saj so uporabljeni na mnogih industrijskih področjih zaradi svojih dobrih mehanskih, termičnih in kemijskih lastnosti. V sodobnem svetu postaja vse bolj iskana lastnost materialov njihova zmožnost recikliranja oziroma dolgotrajne uporabe. Samoceljenje je sposobnost materiala, da po poškodbi popolnoma ali vsaj delno povrne prvotne lastnosti in s tem podaljša življenjsko dobo. Samoceljenje polimernih materialov v grobem delimo na fizikalno samoceljenje, kjer prihaja do fizičnih prepletanj verig in kemijsko samoceljenje, kjer prihaja do vzpostavitve novih vezi. Z namenom preučevanja vpliva topila na samoceljenje epoksi materiala sem v magistrski nalogi najprej po znanih postopkih pripravil epoksi matrice brez in z Diels-Alder komponentami z uporabo topila. Nadalje sem prilagodil pripravo epoksi matric, da sem na uspešen način iz vseh korakov postopka izključil uporabo topila in tako dobil epoksi matrice brez in z Diels-Alder komponentami brez prisotnega topila. Pripravljenim materialom sem z uporabo dinamične mehanske analize primerjal mehanske lastnosti, zamreženje in temperaturo steklastega prehoda. Izkazalo se je, da prisotnost topila zmanjšuje stopnjo zamreženosti in s tem znižuje temperaturo steklastega prehoda. Vpliv topila na učinkovitost samoceljenja sem ovrednotil s pomočjo nateznih testov oziroma lomne žilavosti. Vsakega od materialov sem najprej poškodoval in nato celil pri različnih temperaturnih programih, ki so odgovarjali tako kemijskemu samoceljenju, na osnovi reverzibilne Diels-Alder reakcije kot fizikalnemu samoceljenju nad temperaturo steklastega prehoda. V splošnem je prisotnost topila izboljšala učinkovitost celjenja pri obeh temperaturnih programih.

• Jezik: Slovenski jezik
• Ključne besede: epoksi material, samoceljenje, Diels-Alder komponente, zamreževanje, temperatura steklastega prehoda
• Vrsta gradiva: Magistrsko delo/naloga
• Tipologija: 2.09 - Magistrsko delo
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Leto izida: 2020
• PID: 20.500.12556/RUL-117449
• COBISS.SI-ID: 23512323
• Datum objave v RUL: 10.07.2020

HORVAT, Miha, 2020, Vpliv topila na učinkovitost samoceljenja epoksi materiala z Diels-Alder komponentami [na spletu]. Magistrsko delo. [Dostopano 4 maj 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=117449

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: The effect of solvent on the efficiency of self-healing of epoxy material with Diels-Alder components

Izvleček

Epoxy based materials are an important group of materials as they are used in many industrial fields due to their good mechanical, thermal and chemical properties. In the modern world, the recyclability and the ability of long-term use are becoming more and more desirable properties of materials. Self-healing is the ability of the material that after injury, fully or at least partially restore its properties to the original state and thus prolongs the lifespan. Self-healing of polymeric materials can be in general divided into physical self-healing, where physical entanglements with chains occur and chemical self-healing, where new bonds are formed. To study the effect of solvent on the self-healing of epoxy material in my master's thesis, I first prepared epoxy matrices without and with Diels-Alder components, using the solvent according to known procedures. Furthermore, I successfully adapted the preparation of epoxy matrices by excluding the use of a solvent from all steps of the process, thus obtaining an epoxy matrix without and with Diels-Alder components without the presence of a solvent. Using dynamic mechanical analysis, I compared the mechanical properties, crosslinking and the temperature of the glass transition of prepared materials. As expected, I found that the presence of a solvent reduces the degree of crosslinking and thus lowers the glass transition temperature. The solvent's effect on the efficiency of self-healing was determined with the help of tensile tests by fracture toughness. I first damaged each of the materials and then cured them at different temperature programs which are corresponding to chemical self-healing, based on the reversible Diels-Alder reaction, and physical self-healing, above the glass transition temperature. In general, the presence of a solvent improved the healing efficiency of both temperature programs.

• Ključne besede: epoxy material, self-healing, Diels-Alder components, crosslinking, glass transition temperature