NDLI: Hyperbranched polyesters by polycondensation of fatty acid-based AB<sub><i>n</i></sub>-type monomers

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Hyperbranched polyesters by polycondensation of fatty acid-based AB_n-type monomers

Content Provider	Royal Society of Chemistry (RSC)
Author	Taton, Daniel Cramail, Henri Testud, Blandine Pintori, Didier Grau, Etienne
Copyright Year	2017
Abstract	Widely available vegetable oils were readily derivatized into chemically pure ABn-type monomers (n = 2 or 3). Their polymerization led to unprecedented hyperbranched polyesters. Four different AB2/AB3-type monomers bearing one A-type methyl ester and two or three B-type alcohol functions were purposely synthesized via two elementary steps, i.e. epoxidation of the internal double bond of the vegetable oil precursors followed by ring-opening of the epoxy groups under acidic conditions. The polycondensation of these bio-sourced monomers was performed in bulk, in the presence of an appropriate catalyst, giving access to modular hyperbranched polyesters with tunable properties. Among the catalysts tested, zinc acetate, 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) and sodium methoxide proved the most effective, allowing the achievement of molar masses in the range 3000–10 000 g mol−1 and dispersities varying from 2 to 15, depending on the initial conditions. The degree of branching, DB, as determined by 1H NMR spectroscopy, was found to be between 0.07 and 0.45. The as-devised hyperbranched polyesters displayed either amorphous or semi-crystalline properties, as a function of the selected AB2/AB3-type initial monomers, with a glass transition temperature, Tg, ranging from −33 to 9 °C and a decomposition temperature at 5 wt% of the sample, Td5%, varying from 204 to 340 °C.
Starting Page	259
Ending Page	269
Page Count	11
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	19
Issue Number	1
Journal	Green Chemistry
DOI	10.1039/c6gc02294d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polymerization AB3 Stellar classification Ester Epoxide Alkene Vegetable oil Condensation reaction Zinc acetate To be announced Sodium methoxide Molar mass Nuclear magnetic resonance spectroscopy Glass transition
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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Hyperbranched polyesters by polycondensation of fatty acid-based ABn-type monomers

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