Properties and crystallization of PLLA biopolymers with cellulose nanocrystals and organic plasticizer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F20%3A00007898" target="_blank" >RIV/46747885:24210/20:00007898 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mmscience.eu/journal/issues/november-2020/articles/properties-and-crystallization-of-plla-biopolymers-with-cellulose-nanocrystals-and-organic-plasticizer" target="_blank" >https://www.mmscience.eu/journal/issues/november-2020/articles/properties-and-crystallization-of-plla-biopolymers-with-cellulose-nanocrystals-and-organic-plasticizer</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17973/mmsj.2020_11_2020030" target="_blank" >10.17973/mmsj.2020_11_2020030</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Properties and crystallization of PLLA biopolymers with cellulose nanocrystals and organic plasticizer

Popis výsledku v původním jazyce

The paper deals with the research of ternary nanocomposites based on PLLA nucleated by lignin coated cellulose nanocrystals (L-CNC) and simultaneously modified with an acetyl tributyl citrate (ATBC) plasticizer. The potential synergistic effect of both additives on the crystallization and morphology of nanocomposites is evaluated by differential scanning calorimetry (DSC) and scanning electronic microscopy (SEM). Mechanical properties were evaluated by tensile tests and fracture toughness measurements. DSC analysis showed a synergistic effect of both additives on the crystallization of PLLA. Ternary composites which were plasticized by 10 mass% of ATBC and simultaneously nucleated by L-CNC (1 and 5 mass%) increased the degree of crystallinity up to 2.5 times and manage to eliminate undesired cold crystallization during reheating. A dramatic increase in ductility, associated with a decrease in tensile strength and modulus, was observed with the incorporation of ATBC at 10 mass%. The ductility of the PLLA/10ATBC and PLLA/10ATBC/1L-CNC composites increased from 3 % (PLLA) up to 160 % and 300 %, respectively. Furthermore, SEM analysis showed that higher concentrations of spray-dried L-CNC (5 mass%) are difficult to disperse by used technology. These agglomerates subsequently act as stress concentrators that initiate premature failure of the composites. Although a suitable combination of tensile characteristics was achieved, PLLA/10ATBC/1L-CNC composites still show relatively low Charpy impact strength (15 kJ/m2)

Název v anglickém jazyce

Properties and crystallization of PLLA biopolymers with cellulose nanocrystals and organic plasticizer

Popis výsledku anglicky

The paper deals with the research of ternary nanocomposites based on PLLA nucleated by lignin coated cellulose nanocrystals (L-CNC) and simultaneously modified with an acetyl tributyl citrate (ATBC) plasticizer. The potential synergistic effect of both additives on the crystallization and morphology of nanocomposites is evaluated by differential scanning calorimetry (DSC) and scanning electronic microscopy (SEM). Mechanical properties were evaluated by tensile tests and fracture toughness measurements. DSC analysis showed a synergistic effect of both additives on the crystallization of PLLA. Ternary composites which were plasticized by 10 mass% of ATBC and simultaneously nucleated by L-CNC (1 and 5 mass%) increased the degree of crystallinity up to 2.5 times and manage to eliminate undesired cold crystallization during reheating. A dramatic increase in ductility, associated with a decrease in tensile strength and modulus, was observed with the incorporation of ATBC at 10 mass%. The ductility of the PLLA/10ATBC and PLLA/10ATBC/1L-CNC composites increased from 3 % (PLLA) up to 160 % and 300 %, respectively. Furthermore, SEM analysis showed that higher concentrations of spray-dried L-CNC (5 mass%) are difficult to disperse by used technology. These agglomerates subsequently act as stress concentrators that initiate premature failure of the composites. Although a suitable combination of tensile characteristics was achieved, PLLA/10ATBC/1L-CNC composites still show relatively low Charpy impact strength (15 kJ/m2)

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/EF16_019%2F0000843" target="_blank" >EF16_019/0000843: Hybridní materiály pro hierarchické struktury</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

MM Science Journal

ISSN

1803-1269

e-ISSN

—

Svazek periodika

2020

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

6

Strana od-do

4080-4085

Kód UT WoS článku

000590384500005

EID výsledku v databázi Scopus

2-s2.0-85095835891