Vpliv nastanka omrežja ogljikovih nanocevk na časovno odvisno vedenje polietilena visoke gostote

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Anže Hrastel (Author), Lidija Slemenik Perše (Mentor)

Abstract

Nanokompoziti, izdelani z ogljikovimi nanocevkami, odpirajo nova področja uporabe nanokompozitov in razumevanja fizikalno-kemijskih povezav, kjer nanocevke zaradi svojih unikatnih lastnosti predstavljajo superiorno nanopolnilo. Izjemna trdnost in sposobnost efektivnega prenosa elektronov sta le dve od lastnosti, ki jim dajejo posebno mesto v mehaniki in elektroniki. Izkaže se, da nanocevke vzpostavijo naključno povezano omrežje v matričnem materialu že pri nizkih koncentracijah, kar močno spremeni fizikalne lastnosti materiala. V predstavljenem delu smo preučili vpliv volumskega deleža na ojačitev materiala in spremembo časovno odvisnih lastnosti. Ugotovili smo, da z dodajanjem nanocevk izboljšamo mehansko vedenje materiala le v primeru, ko se vzpostavi omrežje. Vzpostavitev omrežja nad perkolacijsko mejo pospeši časovno odvisne procese, le to material oslabi.

Keywords

magistrske naloge;ogljikove nanocevke;nanokompoziti;lezenje;omrežje CNT-jev;časovno odvisne lastnosti;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[A. Hrastel]
UDC:	620.3:620.17:546.262.5(043.2)
COBISS:	109906435
Views:	432
Downloads:	47
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Efect of carbon nanotube network formation on time-dependent behavior of high-density polyethylene
Secondary abstract:	Nanocomposites prepared with carbon nanotubes open up new areas of application of nanocomposites and understanding of physicochemical inteactions, where nanotubes are a superior nanofiller due to their unique properties. Their exceptional strength and ability to efficiently transfer electrons are just some properties that give them a special place in mechanics and electronics. It turns out that nanotubes form a randomly connected network in the matrix material already at low concentrations, which significantly changes the physical properties of the material. In the presented work, we studied the effect of volume fraction on material reinforcement and the change of time-dependent properties. The results showed that the addition of nanotubes improves the mechanical behaviour of the material only when a network is established. The formation of the network above the percolation limit speeds up time-dependent processes, which weakens the material.
Secondary keywords:	master thesis;carbon nanotubes;nanocomposites;CNT network;creep;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XX, 60 str.
ID:	15446486