Učinak nanočestica boron-nitrida na neka svojstva biopolimernih nanokompozita s celuloznim nanovlaknima i nanočesticama gline
| Autor: | Bulent Kaygin, Gulyaz Al, Deniz Aydemir, Gokhan Gunduz, Nadir Ayrilmis |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
nanoboron nitride
polymer nanocomposites cellulose nanofibrils nanoclays biopolymers Materials science Nanocomposite nanočestice boron-nitrida polimerni nanokompoziti celulozna nanovlakna nanočestice gline biopolimeri Polymer nanocomposite Forestry 02 engineering and technology Nitride engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering engineering Biopolymer Cellulose 0210 nano-technology |
| Zdroj: | DRVNA INDUSTRIJA Drvna industrija Volume 69 Issue 1 |
| ISSN: | 0012-6772 1847-1153 |
| Popis: | The aim of this study was to investigate the effect of nanoboron nitride (BN) as nano-fire retardant on some properties of polylactic acid (PLA) and polyhydroxybutyrate (PHB) biopolymer nanocomposites reinforced with cellulose nanofibrils (CNFs) and nanoclays (NC). BN particles, as nano-fire retardant, were added to enhance the thermal stability of the obtained biopolymer nanocomposites. PLA and PHB nanocomposites were prepared with a twin screw extruder and characterized with mechanical tests, TGA, and DSC. Densities of the PLA and PHB nanocomposites were found to decrease with the addition of NBN loading. The mechanical properties of biopolymer nanocomposites decreased, except for tensile modulus. According to TGA results, NBN loadings generally improved the thermal stability of the PLA and PHB nanocomposites. The degradation temperature for weight loss at 10 %, 50 % and 85 % (T10%, T50% and T85%) increased with NBN loadings; the value of DTGmax was determined to improve with the loading of BN. DSC results showed that melt temperature (Tm) and crystallization temperature (Tc) generally increased with BN loadings, whereas crystallinity (Xc) decreased with BN loadings in PLA nanocomposites. Cilj ove studije bio je ispitati učinak nanočestica boron-nitrida (BN) kao usporivača gorenja na neka svojstva biopolimernih nanokompozita proizvedenih od polilaktične kiseline (PLA) i polihidroksibutirata (PHB) ojačanih celuloznim nanovlaknima (CNFs) i nanočesticama gline (NC). Nanočestice boron-nitrida (NBN), koji je usporivač gorenja, dodane su kako bi se povećala toplinska stabilnost proizvedenih biopolimernih nanokompozita. Nanokompoziti PLA i PHB pripremljeni su uz pomoć dvostrukoga vijčanog ekstrudera i ispitani mehaničkim testovima te TGA i DSC analizom. Utvrđeno je da se gustoća PLA i PHB nanokompozita smanjuje dodatkom NBN čestica. Dodavanjem NBN čestica sva su se mehanička svojstva biopolimernih nanokompozita, osim modula vlačne čvrstoće, smanjila. Prema rezultatima TGA analize, dodane NBN čestice općenito poboljšavaju toplinsku stabilnost PLA i PHB nanokompozita. Dodavanjem NBN čestica povećana je temperatura degradacije za gubitak mase od 10, 50 i 85 % (T10%, T50% i T85%), a poboljšala se i vrijednost DTGmax. Rezultati DSC analize pokazali su da se temperatura taljenja (Tm) i temperatura kristalizacije (Tc) povećavaju s povećanjem udjela NBN čestica, dok se kristaliničnost (Xc) smanjuje s povećanjem količine NBN čestica u PLA nanokompozitu. |
| Databáze: | OpenAIRE |
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