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Vpliv ogljikovih nanocevk v polietilenu visoke gostote na časovno odvisno vedenje nanokompozitov
ID Aljančič, Rok (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 svojih inherentnih lastnosti (npr. izjemna trdnost, efektivni prenos elektronov itd.) in paličaste geometrije, predstavljajo enega izmed najpotencialnejših nanopolnil v polimernih nanokompozitih. V polimernem materialu vzpostavijo tako imenovano omrežje, ki služi kot mehanska ojačitev, prevodna pot, kar lahko izrabimo v različnih trenutnih in prihodnje nastajajočih tehnologijah. V okviru magistrskega dela smo se osredotočili na vpliv ogljikovih nanocevk na časovno odvisno mehansko vedenje, kjer smo preverili vpliv dodatka nanocevk na mehansko ojačitev ter hitrost lezenja polimerne matrice. Rezultati so pokazali, da dodajanje nanocevk pripomore k izboljšanju mehanske ojačitve do 300 %, kar je posledica geometrijskega prepleta cevk znotraj matričnega materiala. Poleg omenjenega smo ugotovili, da nanocevke upočasnijo hitrost primarnega lezenja, vendar zaradi zmanjšanja urejenosti matričnega materiala (padca kristaliničnosti) pospešijo hitrost sekundarnega in terciarnega lezenja.

Language:Slovenian
Keywords:ogljikove nanocevke, nanokompoziti, časovno odvisne mehanske lastnosti, mehanska ojačitev, hitrost lezenja
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Place of publishing:Ljubljana
Publisher:[R. Aljančič]
Year:2022
Number of pages:XXIV, 58 str.
PID:20.500.12556/RUL-142779 This link opens in a new window
UDC:620.3+531/534+539.3(043.2)
COBISS.SI-ID:139407107 This link opens in a new window
Publication date in RUL:25.11.2022
Views:715
Downloads:98
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Secondary language

Language:English
Title:Effect of carbon nanotubes in high-density polyethylene on time-dependent behavior of nanocomposites
Abstract:
Carbon nanotubes represent one of the most promising nanofillers in polymer-based nanocomposites, due to their rod-like geometry and other inherent properties (e.g. exceptional strength and effective electron transfer). Within the polymeric material, they establish a network that serves as a mechanical reinforcement or a conductive pathway, which is useful in various current and emerging technologies. As part of this master’s thesis, we discussed the effects of carbon nanotubes on time-dependent mechanical behavior, primarily focusing on the effects of nanotubes on mechanical reinforcement and creep rate. Results showed that adding nanotubes could increase the mechanical reinforcement up to 300% because of the network formation within the matrix material. Moreover, it was shown that adding nanotubes slows down the rate of the primary creep and also reduces the degree of crystallinity, which accelerates the rate of the secondary and tertiary creep.

Keywords:carbon nanotubes, nanocomposites, time-dependent mechanical properties, mechanical reinforcement, creep rate

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