$The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1$

The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1

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Main Authors:	Nguyen, Tien Thao, Le, Thanh Son
Format:	Article
Language:	English
Published:	ĐHQGHN 2017
Subjects:	CO hydrogenationn Metal dispersio CueCo Perovskite
Online Access:	http://repository.vnu.edu.vn/handle/VNU_123/58209
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Institution:	Vietnam National University, Hanoi
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spelling	oai:112.137.131.14:VNU_123-582092017-09-30T20:29:50Z The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1 Nguyen, Tien Thao Le, Thanh Son CO hydrogenationn Metal dispersio CueCo Perovskite p. 337-342 La(CoCuO3) nanoperovskites have been prepared by the mechano-synthesis method and treated with hydrogen to yield a high dispersion of bimetallic Co-Cu sites. The reduced LaCo1-xCuxO3samples were characterized by XRD, H2-TPR, CO and H2chemisorption and tested for CO dissociation and for alcohol synthesis from syngas. The experimental results indicated that the activities in CO dissociation and hydrogenation on copper-cobalt metals extracted from perovskite lattice crystals are significantly different from those in the extra-perovskite lattice. The overall catalytic activity in syngas conversion is correlated with the Co-Cu metal surface, but the alcohol productivity e productivity of alcohols de-creases in the order of LaCo0.7Cu0.3O3>LaCo0.4Cu0.6O3>Cu2O/LaCoO3>LaCo0.9Cu0.1O3>LaCoO3. The highest catalytic activity and alcohol productivity was obtained over sample of the reduced LaCo0.7-Cu0.3O3 perovskite catalyst 2017-08-24T04:01:35Z 2017-08-24T04:01:35Z 2016 Article 2468-2284 http://repository.vnu.edu.vn/handle/VNU_123/58209 en application/pdf ĐHQGHN
institution	Vietnam National University, Hanoi
building	VNU Library & Information Center
country	Vietnam
collection	VNU Digital Repository
language	English
topic	CO hydrogenationn Metal dispersio CueCo Perovskite
spellingShingle	CO hydrogenationn Metal dispersio CueCo Perovskite Nguyen, Tien Thao Le, Thanh Son The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1
description	p. 337-342
format	Article
author	Nguyen, Tien Thao Le, Thanh Son
author_facet	Nguyen, Tien Thao Le, Thanh Son
author_sort	Nguyen, Tien Thao
title	The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1
title_short	The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1
title_full	The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1
title_fullStr	The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1
title_full_unstemmed	The present work deals with the development of polystyrene (PS) nanocomposites through solvent blending technique with diverse contents of modified CoeAl layered double hydroxide (LDH). The prepared PS as well as PS/CoeAl LDH (1e7 wt.%) nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), rheo-logical analysis, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The XRD results suggested the formation of exfoliated structure, while TEM images clearly indicated the inter-calated morphology of PS nanocomposites at higher loading. The presence of various functional groups in the CoeAl LDH and PS/CoeAl LDH nanocomposites was verified by FTIR analysis. TGA data confirmed that the thermal stability of PS composites was enhanced significantly as compared to pristine PS. While considering 15% weight loss as a reference point, it was found that the thermal degradation (Td) tem-perature increased up to 28.5 C for PS nanocomposites prepared with 7 wt.% CoeAl LDH loading over pristine PS. All the nanocomposite samples displayed superior glass transition temperature (Tg), in which PS nanocomposites containing 7 wt.% LDH showed about 5.5 C higher Tgover pristine PS. In addition, the kinetics for thermal degradation of the composites was studied using Coats-Redfern method. The Criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. The complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine PS when the frequency increased from 0.01 to 100 s 1
title_sort	present work deals with the development of polystyrene (ps) nanocomposites through solvent blending technique with diverse contents of modified coeal layered double hydroxide (ldh). the prepared ps as well as ps/coeal ldh (1e7 wt.%) nanocomposites were characterized by x-ray diffraction (xrd), transmission electron microscopy (tem), fourier transform infrared spectroscopy (ftir), rheo-logical analysis, thermogravimetric analysis (tga) and differential scanning calorimetry (dsc). the xrd results suggested the formation of exfoliated structure, while tem images clearly indicated the inter-calated morphology of ps nanocomposites at higher loading. the presence of various functional groups in the coeal ldh and ps/coeal ldh nanocomposites was verified by ftir analysis. tga data confirmed that the thermal stability of ps composites was enhanced significantly as compared to pristine ps. while considering 15% weight loss as a reference point, it was found that the thermal degradation (td) tem-perature increased up to 28.5 c for ps nanocomposites prepared with 7 wt.% coeal ldh loading over pristine ps. all the nanocomposite samples displayed superior glass transition temperature (tg), in which ps nanocomposites containing 7 wt.% ldh showed about 5.5 c higher tgover pristine ps. in addition, the kinetics for thermal degradation of the composites was studied using coats-redfern method. the criado method was ultimately used to evaluate the decomposition reaction mechanism of the nano-composites. the complex viscosity and rheological muduli of nanocomposites were found to be higher than that of pristine ps when the frequency increased from 0.01 to 100 s 1
publisher	ĐHQGHN
publishDate	2017
url	http://repository.vnu.edu.vn/handle/VNU_123/58209
_version_	1680964120609816576

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