(Co)polymerization of (−)-menthide and β-butyrolactone with yttrium-bis(phenolates): tuning material properties of sustainable polyesters

Autor:	Jia-Jhen Kang, Thomas M. Pehl, Bernhard Rieger, Friederike Adams, Sebastian Kernbichl, Christine M. Papadakis, Moritz Kränzlein
Rok vydání:	2020
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Pyrazine Organic Chemistry Bioengineering Polymer Biochemistry Polyester chemistry.chemical_compound chemistry Polymerization Tacticity Polymer chemistry Copolymer Bifunctional Elastic modulus
Zdroj:	Polymer Chemistry. 11:4426-4437
ISSN:	1759-9962 1759-9954
Popis:	Pyridine-based heteroaromatic yttrium-bis(phenolate) complexes were investigated in ring-opening polymerization of racemic β-butyrolactone (rac-BBL) and (−)-menthide. In addition, AB and BAB copolymers from poly((−)-menthide) (PM, block A) and poly(3-hydroxybutyrate) (PHB, block B) were synthesized via sequential addition. BAB copolymers were accessible through introduction of a bifunctional pyrazine initiator enabling chain growth in two directions. Block copolymers were analyzed using thermal analysis, X-ray diffraction, small-angle X-ray scattering, NMR analysis and stress–strain experiments. These measurements confirmed a microphase separation within the semicrystalline BAB materials. Regarding the mechanical behavior, two hot-moldable PHB-based (co)polymers were investigated. The syndiotactic PHB is less brittle than natural PHB, resulting in a lower Young's modulus. Incorporating PM in the structure, the elastic modulus is further lowered with increasing elongation at break.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ec38f3284fc6109cf88fe81538b47aa0 https://doi.org/10.1039/d0py00379d Zobrazit plný text záznamu