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Enzymatic Synthesis and Characterization of Hydrophilic Sugar Based Polyesters and Their Modification with Stearic Acid

Department of Chemistry, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
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Academic Editor: André Laschewsky
Polymers 2016, 8(3), 80; https://doi.org/10.3390/polym8030080
Received: 18 February 2016 / Revised: 4 March 2016 / Accepted: 9 March 2016 / Published: 16 March 2016
(This article belongs to the Special Issue Polymers for Aqueous Media)
Biodegradable and hydrophilic functional polyesters were synthesized enzymatically using xylitol or d-sorbitol together with divinyl adipate and lipase B from Candida antartica (CAL-B). The resulting polyesters had pendant OH-groups from their sugar units which were esterified to different degrees with stearic acid chloride. The structure and the degrees of polymerization of the resulting graft copolymers based on poly(xylitol adipate) and poly(d-sorbitol adipate) were characterized by 1H NMR spectroscopy and SEC. DSC, WAXS and SAXS measurements indicated that a phase separation between polymer backbone and stearoyl side chains occurred in the graft copolymers, and, additionally, the side chains were able to crystallize which resulted in the formation of a lamellar morphology. Additionally, nanoparticles of the graft copolymers in an aqueous environment were studied by DLS and negative stain TEM. View Full-Text
Keywords: enzymatic synthesis; biodegradable polyesters; sugars; graft copolymers; stearic acid; crystallization; nanoparticles enzymatic synthesis; biodegradable polyesters; sugars; graft copolymers; stearic acid; crystallization; nanoparticles
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MDPI and ACS Style

Bilal, M.H.; Prehm, M.; Njau, A.E.; Samiullah, M.H.; Meister, A.; Kressler, J. Enzymatic Synthesis and Characterization of Hydrophilic Sugar Based Polyesters and Their Modification with Stearic Acid. Polymers 2016, 8, 80.

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