Improving the packaging performance of low-density polyethylene with modified nanocellulose barrier layers

[N. Đorđević ]

XVII, 134 lista

Tehnološko inženjerstvo-Inženjerstvo materijala / Technological Engineering-Material engineering

U okviru ove doktorske disertacije izvršeno je formiranje polietilenskih/polikaprolaktonskih (PE/PCL) hibridnih materijala na bazi nanoceluloze i metalnih oksida. Rad je podeljen na četiri celine. U prvoj je sintetisana i okarakterisana nanoceluloza NC i modifikovana nanoceluloza NCMA i formirani su kompoziti na bazi gvožđe oksida NC-Fe3O4 i NCMA-Fe3O4. U drugom delu su formirani i ispitani dvoslojni hibridni filmovi PE/PCL sa kompozitima NC-Fe3O4 i NCMA-Fe3O4 u polikaprolaktonskom sloju. U trećem delu je sintetisana i okarakterisana nanoceluloza NC i modifikovana nanoceluloza NCMA i formirani su kompoziti na bazi bakar (II) oksida NC-CuO i NCMA-CuO i u četvrtom su formirani i ispitani dvoslojni hibridni filmovi PE/PCL sa kompozitima NC-CuO i NCMA-CuO u polikaprolaktonskom sloju. U prvom delu disertacije su sintetisani kompoziti nanoceluloza-magnetit (NC-Fe3O4) i maleinskom kiselinom funkcionalizovana nanoceluloza/magnetit (NCMA-Fe3O4), a zatim upotrebljeni kao punioci u polikaprolaktonskom sloju (PLC) pri različitim koncentracijama (5, 10 i 15 mas%). Kompozitnim materijalima nanoceluloza-magnetit su najpre proučavane strukturne, morfološke i termalne karakteristike, a nakon toga su inkorporirani u PCL sloj. Strukturna analiza izvršena je na osnovu rezultata dobijenih primenom rendgenske difrakcione analize (XRD) i infracrvene spektroskopije sa Furijeovom transformacijom (FTIR). Morfološka svojstva su proučavana skenirajućom elektronskom mikroskopijom (SEM). Termička svojstva su ispitana primenom termogravimetrijske analize. U drugom delu disertacije, polikaprolaktonski sloj sa puniocima je nanet na površinu polietilenske folije i ispitana su barijerna svojstva dobijenih hibridnih dvoslojnih filmova. Dodatak filera (punilaca) ne narušava prvobitna svojstva polimernog sloja, naročito u pogledu njegovih barijernih svojstava...

Synthesis and characterization of polyethylene/polycaprolactone-modified nanocellulose hybrid materials containing different metal oxides was performed. The work is divided into four parts, and the first is a synthesized and characterized NC nanocellulose and modified NCMA nanocellulose, and composites based on iron oxide NC-Fe3O4 and NCMA- Fe3O4 are formed. In the second part, two-layer hybrid PE/PCL films were formed and tested with NC- Fe3O4 and NCMA- Fe3O4 composites in a polycaprolactone layer. In the third part, NC nanocellulose NC and modified NCMA nanocellulose were synthesized and characterized by copper (II) oxide NC-CuO and NCMA-CuO composites, and in the fourth, two-layer hybrid PE/PCL films were formed with NC-CuO and NCMA-CuO in a polycrystalline layer. Nanonocelulose/magnetite (NC-Fe3O4) nanocomposite and maleic acid functionalized NC/magnetite (NCMA-Fe3O4) nanocomposite were prepared and used as filler at various concentrations (5, 10 and 15 wt. %) in polycaprolactone (PCL) layer. The structural, morphological and thermal properties were investigated, upon composite materials were incorporated in PCL layer. Structural properties of composites were investigated by using FT–IR (Fourier transform infrared spectroscopy) and XRD analysis. The morphological properties were investigated by SEM (scanning electron microscopy). The second part of the thesis was focused on characterization of hybrid multicomponent films containing Fe3O4 nanoparticles. Polycaprolactone filled with nanocellulose/magnetite composites were coated on LDPE layer and barrier properties of low-density polyethylene/polycaprolactone-modified nanocellulose hybrid materials were investigated...

nanokompozitni materijali na bazi PE-a, nanoceluloza, modifikovana nanoceluloza, višeslojni filmovi, barijerna i antibakterijska svojstva, PCL

Nanocomposite materials based on PE, nanocellulose, modified nanocellulose, multilayer films, barrier and antibacterial properties, PCL

66.017:547.458.8:678.742.2(043.3)

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