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Title:Vpliv dodatka nanofibrilirane celuloze na mehanske lastnosti poli(3-hidroksibutirata)
Authors:ID Žepič Bogataj, Vesna (Author)
ID Švara Fabjan, Erika (Author)
ID Poljanšek, Ida (Author)
ID Oven, Primož (Author)
Files:.pdf PDF - Presentation file, download (1,24 MB)
MD5: 9BE7FFBDE243C63C91FB423D58FFC5E3
 
URL URL - Source URL, visit https://doi.org/10.17222/mit.2016.192
 
Language:Slovenian
Typology:1.01 - Original Scientific Article
Organization:Logo ZAG - Slovenian National Building and Civil Engineering Institute
Abstract:Namen prispevka temelji na inovativnem postopku izdelave nanokompozitov na osnovi poli(3-hidroksibutirata) (PHB) in nanofibrilirane celuloze (NFC). Raziskovalno delo obravnava pripravo koncentratnih mešanic PHB-prahu in NFC v vodni raztopini za tehnologijo ekstruzijskega mešanja. Ekstrudat koncentrirane mešanice PHB/NFC je bil nato uporabljen kot dodatek h granulirani obliki PHB pri pripravi brizganih vzorcev z različnimi utežnimi deleži NFC. V prispevku so podane določene omejitve pri predelavi tovrstnih materialov in predlagane uporabne rešitve za njihovo optimiziranje. Morfološke lastnosti nanokompozitnih komponent smo raziskali z elektronsko mikroskopijo (FE-SEM), mehanske lastnosti pa z nateznim preizkusom. Morfološka preiskava koncentratnih mešanic je razkrila prepleteno sestavo celuloznih nanofibril in polimernih kroglic, pri čemer se posamezne fibrile prepletajo v obliki širših pramenov in ustvarjajo videz zamrežene strukture znotraj polimerne komponente. Mikroskopski posnetki nanokompozitnih mešanic in izboljšane mehanske lastnosti izhodnih materialov potrjujejo,da je adhezivni stik med matrično in ojačitveno komponento dosežen, porazdelitev celuloznih nanofibril po polimerni osnovi pahomogena. Nanokompoziti z visokimi utežnimi deleži NFC (10 % utežnega deleža) dosegajo pomembno večje vrednosti modula elastičnosti (Et = 1720 MPa) in raztezka pri pretrgu (b = 3,1 %) ter prenesejo višje pretržne napetosti ( M = 26 MPa) v primerjavi z referenčnim polimernim vzorcem (Et = 1340 MPa;b = 2,4 %; M = 20 MPa). Rezultati študije dokazujejo, da je ob pravilni predpripravi polimernih mešanic in optimizaciji tehnologije ekstruzijske predelave, mogoče izdelati trdne in žilave materiale, pri čemer delež ojačitvene faze narekuje stopnjo izboljšave končnih lastnosti biopolimerne osnove.
Keywords:nanofibrilirana celuloza, poli(3-hidroksibutirat), morfologija, mehanske lastnosti, ekstruzija, tehnologija brizganja
Publication status:Published
Publication version:Version of Record
Publication date:02.06.2017
Publisher:Inštitut za kovinske materiale in tehnologije
Year of publishing:2017
Number of pages:str. 509-514
Numbering:Letn. 51, št. 3
PID:20.500.12556/DiRROS-20217 New window
UDC:67.017:666.96:620.173
ISSN on article:1580-2949
DOI:10.17222/mit.2016.192 New window
COBISS.SI-ID:2307943 New window
Copyright:© MATERIALI IN TEHNOLOGIJE
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Publication date in DiRROS:14.08.2024
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P4-0015
Name:Les in lignocelulozni kompoziti

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License:Other
Description:The journal MATERIALI IN TEHNOLOGIJE/MATERIALS AND TECHNOLOGY is an open access journal, this means its free availability on the public internet, permitting any users to read, download, copy, distribute, print, search, or link to the full texts of these articles, crawl them for indexing, pass them as data to software, or use them for any other non-commercial purposes, without financial, legal, or technical barriers other than those inseparable from gaining access to the internet itself. The only constraint is on reproduction, and the only role for copyright in this domain, should be to give authors control over the integrity of their work and the right to be properly acknowledged and cited.

Secondary language

Language:English
Title:The impact of the nanofibrillated-cellulose addition on the mechanical properties of poly(3-hydroxybutyrate)
Abstract:In this paper a novel processing route for nanocomposites, based on (3-hydroxybutyrate) (PHB) and nanofibrillated cellulose(NFC), is presented. To obtain a uniform dispersion of the reinforcing filler, a PHB powder was first dispersed in water, mixed with an NFC aqueous suspension and then freeze dried to eliminate the water phase from the ensuing system. The dried batch was then extruded and added to the granulated PHB in different weight proportions. Nanocomposites with various NFC contents were subsequently produced with the injection-moulding technology. The processing limits and feasible solutions for their optimization are thoroughly described within this work. Morphological properties were investigated with FE-SEM, while mechanical properties were determined via a tensile test. SEM images showed that the PHB powder can be effectively incorporated into the mesh of cellulose nanofibrils, as clearly evident by the interlaced structure of individual fibrils with the average lateral dimensions of 69±14 nm. Improved mechanical properties and SEM observations confirmed a good interfacial adhesion and uniform distribution of the reinforcing component. Compared to the unfilled matrix (Et = 1340 MPa; M = 20 MPa;b = 2.4 %), an escalating trend in Young’s modulus (Et = 1720 MPa) and tensile strength ( M = 26 MPa), along with decisively improved values of the elongation at break (b = 3.1 %), were observed for the nanocomposites with the highest content of NFC. According to the results presented, strong and tough nanocomposites can be produced via extrusion moulding, whereby the proportion of the reinforcing phase dictates the final material performances.


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