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Effects of thermal treatment and nucleating agents on crystallinity, toughness, and stiffness of PLA/PCL blends
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SYSNO ASEP 0550856 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Effects of thermal treatment and nucleating agents on crystallinity, toughness, and stiffness of PLA/PCL blends Tvůrce(i) Ujčić, Aleksanda (UMCH-V) RID, ORCID
Fortelný, Ivan (UMCH-V) RID
Krejčíková, Sabina (UMCH-V)
Pavlova, Ewa (UMCH-V) RID
Hodan, Jiří (UMCH-V)
Šlouf, Miroslav (UMCH-V) RID, ORCIDZdroj.dok. Express Polymer Letters. - : Budapest University of Technology and Economics, Department of Polymer Engineering - ISSN 1788-618X
Roč. 16, č. 3 (2022), s. 221-233Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. HU - Maďarsko Klíč. slova polymer blends and alloys ; poly(lactic acid) ; poly(ε-caprolactone) Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP NU21-06-00084 GA MZd - Ministerstvo zdravotnictví Způsob publikování Open access Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000752462200002 EID SCOPUS 85125891967 DOI 10.3144/expresspolymlett.2022.18 Anotace The effects of the thermal treatment and nucleating agents on the morphology, crystallinity, and mechanical properties of poly(lactic acid)/poly(ε-caprolactone) (PLA/PCL) blends were studied in order to obtain PLA/PCL blends with both high stiffness and toughness. The standard thermal treatment of the melt-mixed blends (a compression molding without annealing) resulted in the systems with optimized morphology (at PLA/PCL ratio 80/20) and very high toughness (ca 16×higher with respect to neat PLA), but the stiffness at elevated temperatures (above Tg of PLA at 65 °C) was low due to the low crystallinity of the PLA matrix (<10%). The compression molding with annealing at 110 °C could increase the crystallinity of PLA (up to ~40%), but the toughness decreased steeply due to morphological changes (a coalescence of PCL particles associated with the structure coarsening). The lowering of the annealing temperature (to 80 °C) and addition of the PLA nucleating agent (1 wt% of talc) led to the blends showing both high toughness (9× with respect to neat PLA) and crystallinity (~35%). Dynamic mechanical analysis evidenced that the higher PLA crystallinity improved the storage modulus at temperatures >60 °C by ca two orders of magnitude. The achieved combination of the PLA/PCL toughness and stiffness was one of the highest, according to the available literature. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2023 Elektronická adresa http://www.expresspolymlett.com/issue.php?y=2022&n=3
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