Non-isothermal crystallization kinetics of biocomposites based on PLA/PHBV and spent coffee grounds

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F24%3A00012724" target="_blank" >RIV/46747885:24210/24:00012724 - isvavai.cz</a>

Výsledek na webu

<a href="https://rdcu.be/d3g5B" target="_blank" >https://rdcu.be/d3g5B</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-024-13480-2" target="_blank" >10.1007/s10973-024-13480-2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Non-isothermal crystallization kinetics of biocomposites based on PLA/PHBV and spent coffee grounds

Popis výsledku v původním jazyce

This study deals with the modification of a predominantly amorphous poly(lactic acid) (PLA) by blending it with a semi-crystalline biopolymer, polyhydroxybutyrate-co-valerate (PHBV), which has a high crystallinity. The blends with different concentrations of PLA and PHBV were compounded with spent coffee grounds (SCGs) and processed by injection moulding. The structural, thermal and mechanical properties of the produced samples were investigated. Particular attention was paid to the effect of the presence of SCG and the concentration of PHBV in the blend on the crystallization kinetics and the heat deflection temperature (HDT). For equimolar blends, only a slight increase in HDT (about 5 °C) was observed, but the addition of PHBV suppressed the cold crystallization of PLA, which otherwise negatively affects the dimensional stability of injection moulded parts. A similar effect, but to a lesser extent, was achieved by adding SCG to the PLA matrix. Thus, it is clear that the material structures of PLA/PHBV blends and composites help to minimize additional shrinkage of the parts and increase their dimensional stability. Due to the co-continuous structure of the symmetric PLA/PHBV blends and the increase in the degree of crystallinity from 36 to 47% by annealing the produced samples, the heat deflection temperature increased from 65 up to 90 °C.

Název v anglickém jazyce

Non-isothermal crystallization kinetics of biocomposites based on PLA/PHBV and spent coffee grounds

Popis výsledku anglicky

This study deals with the modification of a predominantly amorphous poly(lactic acid) (PLA) by blending it with a semi-crystalline biopolymer, polyhydroxybutyrate-co-valerate (PHBV), which has a high crystallinity. The blends with different concentrations of PLA and PHBV were compounded with spent coffee grounds (SCGs) and processed by injection moulding. The structural, thermal and mechanical properties of the produced samples were investigated. Particular attention was paid to the effect of the presence of SCG and the concentration of PHBV in the blend on the crystallization kinetics and the heat deflection temperature (HDT). For equimolar blends, only a slight increase in HDT (about 5 °C) was observed, but the addition of PHBV suppressed the cold crystallization of PLA, which otherwise negatively affects the dimensional stability of injection moulded parts. A similar effect, but to a lesser extent, was achieved by adding SCG to the PLA matrix. Thus, it is clear that the material structures of PLA/PHBV blends and composites help to minimize additional shrinkage of the parts and increase their dimensional stability. Due to the co-continuous structure of the symmetric PLA/PHBV blends and the increase in the degree of crystallinity from 36 to 47% by annealing the produced samples, the heat deflection temperature increased from 65 up to 90 °C.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20303 - Thermodynamics

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

2024

Kód důvěrnosti údajů

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

Název periodika

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY

ISSN

1388-6150

e-ISSN

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Svazek periodika

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Číslo periodika v rámci svazku

AUG 6

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

19

Strana od-do

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Kód UT WoS článku

001284799400006

EID výsledku v databázi Scopus

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