Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends

Transition metals had been reported to act as effective pro oxidative additive for polymers. This study deals with the synthesis and characterization of three active transition metals complexes such as cobalt stearate, cupric stearate, and ferric stearate. A derivative of active transition metals st...

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Main Author:	Awang, Nuha
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/34686/5/NuhaAwangMFKK2013.pdf
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spelling	my-utm-ep.346862017-07-19T07:34:39Z Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends 2013-04 Awang, Nuha TP Chemical technology Transition metals had been reported to act as effective pro oxidative additive for polymers. This study deals with the synthesis and characterization of three active transition metals complexes such as cobalt stearate, cupric stearate, and ferric stearate. A derivative of active transition metals stearate were synthesized by increasing the pH of metal acetate solution stirred with stearic acid in the presence of sodium hydroxide (NaOH) at 80 oC. The formula for the trimer as prepared is [CH3 (CH2)nCOO]M (M= metal). The melting points of the additives were obtained by differential scanning calorimetry (DSC) which resulted 94.33 oC, 99.85 oC and 66.90 oC respectively. Thermogravimetric analysis (TGA) was also conducted to study the thermal stabilities of the additives. The study also involved the investigation of the effect of the oxidative additives on the degradation process of general purpose polystyrene (GPPS). The additives were blended with GPPS with the formulation 0.05-0.20 wt %. Studies on the effects of additives were then carried out by exposing the samples into the oven at 70 oC, 90 oC and 100 oC respectively for 50 hours. The chemical and mechanical changes induced by this exposure were followed by fourier transform infrared spectroscopy (FTIR), melt flow index (MFI), tensile test, TGA and DSC. Surface morphologies of degraded samples were observed by using scanning electron microscopy (SEM). The FTIR result indicates that carbonyl compound had the most significant changes for cobalt stearate at 1756.8-1800 cm-1. The absorption around band 1756.8 cm-1 which can be assigned to the stretching of C=O functionalities, increased in intensity and broadened substantially, indicating the presence of the most effective oxidation product which is cobalt stearate. The thermo oxidative degradation in presence of metals stearate was found that all the additives effective were at 0.2 wt % according to the following arrangement cobalt> cupric>ferric in 90 oC air exposure. 2013-04 Thesis http://eprints.utm.my/id/eprint/34686/ http://eprints.utm.my/id/eprint/34686/5/NuhaAwangMFKK2013.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:69711?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Universiti Teknologi Malaysia, Faculty of Chemical Engineering Faculty of Chemical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Awang, Nuha Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
description	Transition metals had been reported to act as effective pro oxidative additive for polymers. This study deals with the synthesis and characterization of three active transition metals complexes such as cobalt stearate, cupric stearate, and ferric stearate. A derivative of active transition metals stearate were synthesized by increasing the pH of metal acetate solution stirred with stearic acid in the presence of sodium hydroxide (NaOH) at 80 oC. The formula for the trimer as prepared is [CH3 (CH2)nCOO]M (M= metal). The melting points of the additives were obtained by differential scanning calorimetry (DSC) which resulted 94.33 oC, 99.85 oC and 66.90 oC respectively. Thermogravimetric analysis (TGA) was also conducted to study the thermal stabilities of the additives. The study also involved the investigation of the effect of the oxidative additives on the degradation process of general purpose polystyrene (GPPS). The additives were blended with GPPS with the formulation 0.05-0.20 wt %. Studies on the effects of additives were then carried out by exposing the samples into the oven at 70 oC, 90 oC and 100 oC respectively for 50 hours. The chemical and mechanical changes induced by this exposure were followed by fourier transform infrared spectroscopy (FTIR), melt flow index (MFI), tensile test, TGA and DSC. Surface morphologies of degraded samples were observed by using scanning electron microscopy (SEM). The FTIR result indicates that carbonyl compound had the most significant changes for cobalt stearate at 1756.8-1800 cm-1. The absorption around band 1756.8 cm-1 which can be assigned to the stretching of C=O functionalities, increased in intensity and broadened substantially, indicating the presence of the most effective oxidation product which is cobalt stearate. The thermo oxidative degradation in presence of metals stearate was found that all the additives effective were at 0.2 wt % according to the following arrangement cobalt> cupric>ferric in 90 oC air exposure.
format	Thesis
qualification_level	Master's degree
author	Awang, Nuha
author_facet	Awang, Nuha
author_sort	Awang, Nuha
title	Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
title_short	Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
title_full	Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
title_fullStr	Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
title_full_unstemmed	Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
title_sort	synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends
granting_institution	Universiti Teknologi Malaysia, Universiti Teknologi Malaysia, Faculty of Chemical Engineering
granting_department	Faculty of Chemical Engineering
publishDate	2013
url	http://eprints.utm.my/id/eprint/34686/5/NuhaAwangMFKK2013.pdf
_version_	1747816234696572928

Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends

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