Nastanek omrežja ogljikovih nanocevk v polietilenu ter njegov vpliv na fizikalne lastnosti nanokompozitov

doktorsko delo

Alen Oseli (Author), Lidija Slemenik Perše (Mentor)

Abstract

Ogljikove nanocevke zaradi inherentnih lastnosti predstavljajo superiorna funkcionalna polnila v polimernih nanokompozitih, saj omogočajo odlično mehansko ojačitev, električno prevodnost in druge podobne lastnosti. Rezultati doktorskega dela so pokazali, da se ogljikove nanocevke med predelavo razpletejo v obliki snopov (sekundarnih aglomeratov), ki pa jih lahko obravnavamo kot Brownove (termo- in hidrodinamsko gnane), palicam podobne enote. Te se pri kritičnem volumskem deležu (fi) v,krit ((beta) (približno simbol) 30) v polimernem materialu geometrijsko prepletejo ter vzpostavijo naključno povezano omrežje v skladu s teorijo reptacije paličastih sistemov. Vzpostavljeno omrežje spremeni morfološko sliko nanokompozitov, ki je predvsem vezana na skeletno strukturo makromolekul matričnega materiala in neposredno vpliva na mehansko vedenje nanokompozitov (mehansko ojačitev, časovno odvisnost, an/izotropijo itd.).

Keywords

disertacije;ogljikove nanocevke;nanokompoziti;morfologija omrežja;mehanizmi nastanka omrežja;fizikalne lastnosti;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.08 - Doctoral Dissertation
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[A. Oseli]
UDC:	620.3:620.17:546.262.5(043.3)
COBISS:	83836931
Views:	662
Downloads:	168
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Carbon nanotube network formation in polyethylene and its effect on physical properties of nanocomposites
Secondary abstract:	Due to their inherent properties, carbon nanotubes (CNT) present a superior functional filler (mechanical reinforcement, electrical conductivity, etc.) in so-called polymer nanocomposites. The results of the PhD thesis showed that during precessing, CNT disentangle in the form of bundles (secondary agglomerates), which can be considered as Brownian (thermally and hydrodynamically driven) rod-like particles. At critical volume fraction (fi) v,crit ((beta)(approximately symbol) 30), those rods establish randomly connected network in the polymeric material (following a reptation theory of rod-like systems). The established network changes the morphological picture, which is mainly connected to the skeletal molecular structure of matrix material and directly affects the mechanical behavior of CNT nanocomposites (mechanical reinforcement, time-dependence, an/isotropy, etc.).
Secondary keywords:	dissertations;carbon nanotubes;polymer nanocomposites;network morphology;mechanisms of network formation;physical properties;
Type (COBISS):	Doctoral dissertation
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XXVI, 113 str.
ID:	13826354