Influence of chemical composition of brazilian organoclays on the morphological, structural and thermal properties of PLA-organoclay nanocomposites
Jefferson Lopes Alves, Paulo de Tarso Vieira e Rosa, Vera Realinho, Marcelo Antunes, Jose Ignacio Velasco, Ana Rita Morales
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the Brazilian National Council of Scientific and Technological Development (CNPQ) [grant numbers 142448/2013-3, 232751/2014-5] and the Spanish Ministry of Economy and Competitiveness (MINECO) for the financial support of the Project MAT2017-89787-P
The effects of adding different Brazilian organoclays, containing di-(hydrogenated tallow) dimethyl ammonium chloride (HTA), trihexyl tetradecyl phosphonium chloride (TDP), di(alkyl ester) dimethyl ammonium chloride (EA) and ethoxylated tallow amine (ETA), on the structure and properties of...
Ver mais
The effects of adding different Brazilian organoclays, containing di-(hydrogenated tallow) dimethyl ammonium chloride (HTA), trihexyl tetradecyl phosphonium chloride (TDP), di(alkyl ester) dimethyl ammonium chloride (EA) and ethoxylated tallow amine (ETA), on the structure and properties of poly(lactic acid) (PLA) nanocomposites, are presented. Single and hybrid organo-modified montmorillonites (OMt and HOMt, respectively) were used to prepare nanocomposites by melt mixing in a twin screw extruder. The structural and morphological properties of the nanocomposites were evaluated using wide-angle X-ray diffraction and transmission electron microscopy. The thermal behavior was studied by differential scanning calorimetry. Fourier-transform infrared spectroscopy was used to investigate the interactions between the different organoclays and PLA. Additionally, commercial organoclays (Cloisite 30B and Cloisite 20A) were used and compared with the Brazilian organoclays. It was verified that the structure and properties of the nanocomposites highly depended on chemical composition. Comparatively, HOMt containing EA and ETA presented better compatibility with PLA, showing the best level of clay dispersion. Differential scanning calorimetry showed a dependence on the nanocomposite thermal behavior with the dispersion level of the organoclays. In general, the presence of OMt and HOMt reduced the glass transition temperature of PLA and its cold crystallization temperature, and increased its crystallinity, which was related to an effective heterogeneous crystal nucleation promoted by the organoclay
Ver menos
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
142448/2013-3, 232751/2014-5
Fechado
Influence of chemical composition of brazilian organoclays on the morphological, structural and thermal properties of PLA-organoclay nanocomposites
Jefferson Lopes Alves, Paulo de Tarso Vieira e Rosa, Vera Realinho, Marcelo Antunes, Jose Ignacio Velasco, Ana Rita Morales
Influence of chemical composition of brazilian organoclays on the morphological, structural and thermal properties of PLA-organoclay nanocomposites
Jefferson Lopes Alves, Paulo de Tarso Vieira e Rosa, Vera Realinho, Marcelo Antunes, Jose Ignacio Velasco, Ana Rita Morales
Fontes
|
Applied clay science Vol. 180 (Nov., 2019), n. art. 105186 |