TY - JOUR
T1 - Thermal stability evaluation of polystyrene-Mg/zn/Al LDH nanocomposites
AU - De La Rosa-Guzmán, Miguel Ángel
AU - Guzmán-Vargas, Ariel
AU - Cayetano-Castro, Nicolás
AU - Del Río, José Manuel
AU - Corea, Mónica
AU - Martínez-Ortiz, María De Jesús
N1 - Publisher Copyright:
© 2019, MDPI AG. All rights reserved.
PY - 2019/11
Y1 - 2019/11
N2 - A series of samples of Mg/Zn/Al LDHs (layered double hydroxides) materials was prepared by the co-precipitation and urea hydrolysis methods. They were modified with organic surfactants (acrylate and oleate anions) and characterized by X-ray diffraction, which corroborated the intercalation of anionic species into the interlayer space. The hydrophobized materials were incorporated at low contents (10 and 15 wt.%) to polystyrene, which was synthesized by emulsion polymerization techniques. The polymeric composites were analyzed by thermogravimetry to determine the decomposition temperature. The results demonstrated that the materials with Zn presented the greatest increment in the degradation temperature (7 °C < T < 54 °C). Moreover, the Friedman, Flynn–Wall–Ozawa, and Coats–Redfern models were compared to obtain the kinetic parameters of degradation process. The obtained order of decomposition of the Coats–Redfern model showed that the decomposition process occurs in at least two stages. Finally, the addition of environmentally friendly modified Layered Double Hydroxides (LDH) nanomaterials to the polystyrene (PS) matrix allowed for obtaining polymeric composites with higher thermal stability, retarding the decomposition process of PS.
AB - A series of samples of Mg/Zn/Al LDHs (layered double hydroxides) materials was prepared by the co-precipitation and urea hydrolysis methods. They were modified with organic surfactants (acrylate and oleate anions) and characterized by X-ray diffraction, which corroborated the intercalation of anionic species into the interlayer space. The hydrophobized materials were incorporated at low contents (10 and 15 wt.%) to polystyrene, which was synthesized by emulsion polymerization techniques. The polymeric composites were analyzed by thermogravimetry to determine the decomposition temperature. The results demonstrated that the materials with Zn presented the greatest increment in the degradation temperature (7 °C < T < 54 °C). Moreover, the Friedman, Flynn–Wall–Ozawa, and Coats–Redfern models were compared to obtain the kinetic parameters of degradation process. The obtained order of decomposition of the Coats–Redfern model showed that the decomposition process occurs in at least two stages. Finally, the addition of environmentally friendly modified Layered Double Hydroxides (LDH) nanomaterials to the polystyrene (PS) matrix allowed for obtaining polymeric composites with higher thermal stability, retarding the decomposition process of PS.
KW - Decomposition kinetic
KW - Degradation temperature
KW - Hydrophobization
KW - Layered double hydroxides
KW - Nanocomposites
KW - Polystyrene
UR - http://www.scopus.com/inward/record.url?scp=85078123903&partnerID=8YFLogxK
U2 - 10.3390/nano9111528
DO - 10.3390/nano9111528
M3 - Artículo
C2 - 31717847
SN - 2079-4991
VL - 9
JO - Nanomaterials
JF - Nanomaterials
IS - 11
M1 - 1528
ER -