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Strong synergistic effects in PLA/PCL blends: impact of PLA matrix viscosity
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SYSNO ASEP 0470664 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Strong synergistic effects in PLA/PCL blends: impact of PLA matrix viscosity Tvůrce(i) Ostafinska, Aleksandra (UMCH-V) RID, ORCID
Fortelný, Ivan (UMCH-V) RID
Hodan, Jiří (UMCH-V)
Krejčíková, Sabina (UMCH-V)
Nevoralová, Martina (UMCH-V) RID, ORCID
Kredatusová, Jana (UMCH-V) RID
Kruliš, Zdeněk (UMCH-V) RID, ORCID
Kotek, Jiří (UMCH-V) RID
Šlouf, Miroslav (UMCH-V) RID, ORCIDZdroj.dok. Journal of the Mechanical Behavior of Biomedical Materials. - : Elsevier - ISSN 1751-6161
Roč. 69, May (2017), s. 229-241Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova polymer blends ; bone tissue engineering ; poly(lactic acid) Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GA14-17921S GA ČR - Grantová agentura ČR LO1507 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000400199600025 EID SCOPUS 85009401615 DOI 10.1016/j.jmbbm.2017.01.015 Anotace Blends of two biodegradable polymers, poly(lactic acid) (PLA) and poly(epsilon-caprolactone) (PCL), with strong synergistic improvement in mechanical performance were prepared by melt-mixing using the optimized composition (80/20) and the optimized preparation procedure (a melt-mixing followed by a compression molding) according to our previous study. Three different PLA polymers were employed, whose viscosity decreased in the following order: PLC approximately equal to PLA1 > PLA2 > PLA3. The blends with the highest viscosity matrix (PLA1/PCL) exhibited the smallest PCL particles (d~0.6 mu m), an elastic-plastic stable fracture (as determined from instrumented impact testing) and the strongest synergistic improvement in toughness (>16× with respect to pure PLA, exceeding even the toughness of pure PCL). According to the available literature, this was the highest toughness improvement in non-compatiblized PLA/PCL blends ever achieved. The decrease in the matrix viscosity resulted in an increase in the average PCL particle size and a dramatic decrease in the overall toughness: the completely stable fracture (for PLA1/PCL) changed to the stable fracture followed by unstable crack propagation (for PLA2/PCL) and finally to the completely brittle fracture (for PLA3/PCL). The stiffness of all blends remained at well acceptable level, slightly above the theoretical predictions based on the equivalent box model. Despite several previous studies, the results confirmed that PLA and PCL could behave as compatible polymers, but the final PLA/PCL toughness is extremely sensitive to the PCL particle size distribution, which is influenced by both processing conditions and PLA viscosity. PLA/PCL blends with high stiffness (due to PLA) and toughness (due to PCL) are very promising materials for medical applications, namely for the bone tissue engineering. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2017
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