Insolubilization and thermal stabilization of a long-chain polyester by noncatalyzed melt-polycondensation synthesis in air
2017
Benítez, José J. | Heredia-Guerrero, José A. | Cruz-Carrillo, Miguel A. | Barthel, Markus J. | Knicker, Heike | Heredia, Antonio | Junta de Andalucía | European Commission | Consejo Nacional de Ciencia y Tecnología (México) | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
Self-standing films of poly(ω-hydroxyl hexadecanoic acid) [poly(ω-OHC16)] have been prepared by noncatalyzed melt-polycondensation in air at 150, 175, and 200 °C. Poly(ω-OHC16)s obtained are characterized as polyesters by infrared spectroscopy (FT-IR) and solid state magic angle spinning 13C nuclear magnetic resonance (13C MAS-NMR). Structurally, poly(ω-OHC16)s are quite crystalline as revealed by wide angle X-ray diffraction (WAXD). The presence of oxygen in the reaction atmosphere causes a mild oxidation in the form of peroxyester species, tentatively at the interphase between poly(ω-OHC16) crystallites, and the structure amorphization. The interfacial peroxyester phase ends up in the encapsulation of the polyester grains and provides a barrier towards the action of solvents. Thermal stabilization and insolubility resulting from the synthesis conditions used are interesting features to prepare solvent and heat resistant poly(ω-OHC16) coatings. Thus, a few microns thick poly(ω-OHC16) layer has been fabricated on aluminum foil and its resistivity towards a chloroform:methanol (1:1, v:v) mixture has been confirmed
Mostrar más [+] Menos [-]Funding is provided by the Andalusian Regional Government (Junta de Andalucía grant TEP-7418). JAH-G acknowledges the BIOPROTO project (Marie Curie Intra-European Fellowship), financed by the EU Seventh Framework Programme for Research (FP7). MAC-C is a post-doctoral grant holder from the CONACYT (Mexico) mobility program.
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