Synthesis and morphology characteristics of new highly branched polycaprolactone PCL

0584545 - ÚMCH 2025 RIV CH eng J - Článek v odborném periodiku
Ziolo, A. - Mossety-Leszczak, B. - Walczak, M. - Strachota, Beata - Strachota, Adam - Awsiuk, K. - Janiszewska, N. - Raczkowska, J.
Synthesis and morphology characteristics of new highly branched polycaprolactone PCL.
Molecules. Roč. 29, č. 5 (2024), č. článku 991. E-ISSN 1420-3049
Institucionální podpora: RVO:61389013
Klíčová slova: highly branched polymers * star polymers * poly(caprolactone)
Obor OECD: Polymer science
Impakt faktor: 4.6, rok: 2022
Způsob publikování: Open access
https://www.mdpi.com/1420-3049/29/5/991

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.
Trvalý link: https://hdl.handle.net/11104/0352457