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Title

Biodegradable Polyester Films from Renewable Aleuritic Acid: Surface Modifications Induced by Melt-polycondensation in Air.

AuthorsBenítez, José J. ; Heredia-Guerrero, José A. ; Vargas-Parody, Inmaculada de; Cruz-Carrillo, Miguel A.; Morales-Flórez, Víctor ; Rosa-Fox, Nicolás de la; Heredia, Antonio
KeywordsRenewable polyesters,
Biodegradable long-chain polyesters,
Films and coatings
Polymer surface characterization
Issue Date2016
PublisherInstitute of Physics Publishing
CitationJournal of Physics D - Applied Physics 49 (2016)
AbstractGood water barrier properties and biocompatibility of long-chain biopolyesters like cutin and suberin have inspired the design of synthetic mimetic materials. Most of these biopolymers are made from esterified mid-chain functionalized ω-long chain hydroxyacids. Aleuritic (9,10,16-trihydroxypalmitic) acid is such a polyhydroxylated fatty acid and is also the major constituent of natural lac resin, a relatively abundant and renewable resource. Insoluble and thermostable films have been prepared from aleuritic acid by meltcondensation polymerization in air without catalysts, an easy and attractive procedure for large scale production. Intended to be used as a protective coating, the barrier's performance is expected to be conditioned by physical and chemical modifications induced by oxygen on the air-exposed side. Hence, the chemical composition, texture, mechanical behavior, hydrophobicity, chemical resistance and biodegradation of the film surface have been studied by attenuated total reflection–Fourier transform infrared spectroscopy (ATR–FTIR), atomic force microscopy (AFM), nanoindentation and water contact angle (WCA). It has been demonstrated that the occurrence of side oxidation reactions conditions the surface physical and chemical properties of these polyhydroxyester films. Additionally, the addition of palmitic acid to reduce the presence of hydrophilic free hydroxyl groups was found to have a strong influence on these parameters
Publisher version (URL)http://dx.doi.org/10.1088/0022-3727/49/17/175601
URIhttp://hdl.handle.net/10261/132559
DOI10.1088/0022-3727/49/17/175601
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