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Master's Dissertation
DOI
https://doi.org/10.11606/D.46.2003.tde-02122015-141614
Document
Author
Full name
Floripes Ferreira de Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2003
Supervisor
Committee
Matos, Jivaldo do Rosario (President)
Machado, Luci Diva Brocardo
Velasco, Maria Valeria Robles
Title in Portuguese
Contribuição da análise térmica no desenvolvimento de formulações de batons
Keywords in Portuguese
Análise térmica
Batom
Cosméticos (Desenvolvimento)
DSC
Método termoanalítico (Aplicações industriais)
TG/DTG
Abstract in Portuguese
Este trabalho consiste na caracterização química, física e termoanalítica de algumas amostras de batons e dos componentes de suas formulações. O estudo termoanalítico foi desenvolvido a partir das técnicas TG/OTG sob atmosfera dinâmica de ar ou enriquecida com O2 e por DSC sob atmosfera dinâmica de N2, com razão de aquecimento de 10°C min-1 em ambos os casos. Os testes de estabilidade com exposição das amostras a 4, 25 e 43°C e à luz solar indireta permitiram avaliar as propriedades organolépticas, físicas e térmicas. Os resultados da análise de ponto de fusão obtidos pelo método convencional foram comparados àqueles encontrados por ensaios de DSC. A estabilidade térmica foi determinada pela exposição a 43°C em estufa convencional e a partir da técnica de TG no estudo da cinética de decomposição, utilizando-se os métodos dinâmico e isotérmico. Foi realizada a predição do prazo de validade de 2,4 anos para uma amostra específica de batom foi determinada por meio do estudo cinético pelo método isotérmico, aplicando-se a equação de Arrhenius. A performance de três diferentes antioxidantes quanto à estabilidade térmica de uma amostra de batom foi avaliada, verificando-se, melhor comportamento da mistura de tocoferáis aplicada a 1%.
Title in English
Contribution of thermal analysis in the development of lipstick formulations
Keywords in English
cosmetics (Development)
DSC
Lipstick
TG/DTG
thermal analysis
Thermoanalytical method (Industrial applications)
Abstract in English
This work consists of the chemical, physical and thermoanalytical characterization of some samples of lipsticks and the components of their formulation. The thermoanalytical study was developed by means of TG/DTG techniques under dynamic air atmosphere or air enriched with O2 and by DSC in dynamic nitrogen atmosphere, with heating rate of 10°C min-1 in both cases. The stability tests with the submitled samples at 4, 25, 43°C and sunlight allowed to evaluate the organoleptic, physical and thermal properties. The analytical results of melting point obtained from conventional methods were compared to the ones measured by DSC. The thermal stability was determined by exposition at 43°C in a conventional stove and by TG technique in the study of decomposition's kinetic, using dynamic and isothermal methods. A shelf-life prediction of 2.4 years for a specific sample of Iipstick was determined by means of a kinetic study, using an isothermal method and applying Arrhenius' equation. The performance of three different antioxidants concerning the thermal stability of a Iipstick sample was evaluated, the tocopherol mix showed the better performance when applied at 1%.
 
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Publishing Date
2015-12-02
 
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