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Nastanek omrežja ogljikovih nanocevk v polietilenu ter njegov vpliv na fizikalne lastnosti nanokompozitov
ID Oseli, Alen (Author), ID Slemenik Perše, Lidija (Mentor) More about this mentor... This link opens in a new window

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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 ?(v,krit) (ß?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.).

Language:Slovenian
Keywords:ogljikove nanocevke, nanokompoziti, morfologija omrežja, mehanizmi nastanka omrežja, fizikalne lastnosti
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Place of publishing:Ljubljana
Publisher:[A. Oseli]
Year:2021
Number of pages:XXVI, 113 str.
PID:20.500.12556/RUL-132848 This link opens in a new window
UDC:620.3:620.17:546.262.5(043.3)
COBISS.SI-ID:83836931 This link opens in a new window
Publication date in RUL:05.11.2021
Views:1244
Downloads:220
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Secondary language

Language:English
Title:Carbon nanotube network formation in polyethylene and its effect on physical properties of nanocomposites
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 Φ(v,crit) (β⡈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.).

Keywords:carbon nanotubes, polymer nanocomposites, network morphology, mechanisms of network formation, physical properties

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