Počet záznamů: 1
Synthesis and morphology characteristics of new highly branched polycaprolactone PCL
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SYSNO ASEP 0584545 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Synthesis and morphology characteristics of new highly branched polycaprolactone PCL Tvůrce(i) Ziolo, A. (PL)
Mossety-Leszczak, B. (PL)
Walczak, M. (PL)
Strachota, Beata (UMCH-V) RID
Strachota, Adam (UMCH-V) RID, ORCID
Awsiuk, K. (PL)
Janiszewska, N. (PL)
Raczkowska, J. (PL)Číslo článku 991 Zdroj.dok. Molecules. - : MDPI
Roč. 29, č. 5 (2024)Poč.str. 23 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova highly branched polymers ; star polymers ; poly(caprolactone) Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science Způsob publikování Open access Institucionální podpora UMCH-V - RVO:61389013 UT WOS 001182919900001 EID SCOPUS 85187763264 DOI 10.3390/molecules29050991 Anotace A simple and efficient method for the synthesis of biodegradable, highly branched polycaprolactone (PCL) is presented. The solvent-free (bulk) reaction was carried out via ring opening polymerization (ROP), catalyzed by tin octanoate Sn(Oct)2, and it employed hyperbranched polyamide (HPPA) as a macro-initiator. The core–shell structure of the obtained products (PCL-HPPA), with the hyperbranched HPPA core and linear PCL chains as shell, was in the focus of the product characterization. 1H nuclear magnetic resonance (1H NMR) and elemental analysis confirmed the covalent incorporation of the HPPA in the products, as well as a high degree of grafting conversion of its amino functional groups. Confocal Raman Micro spectroscopy, and especially Time-of-Flight Secondary Ion Mass Spectrometry, further supported the existence of a core–shell structure in the products. Direct observation of macromolecules by means of cryogenic transmission electron microscopy, as well as gel permeation chromatography (GPC), suggested the existence of a minor ‘aggregated’ product fraction with multiple HPPA cores, which was attributed to transesterification reactions. Differential scanning calorimetry, as well as X-ray diffraction, demonstrated that the PCL-HPPA polymers displayed a similar degree of crystallinity to linear neat PCL, but that the branched products possessed smaller and less regular crystallites. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2025 Elektronická adresa https://www.mdpi.com/1420-3049/29/5/991
Počet záznamů: 1