Theory and application of dynamic mechanical thermal analysis

Wetton, R.E.; Marsh, R.D.L.; Van-de-Velde, J.G.

doi:10.1016/0040-6031(91)80240-j

Cited by 66 publications

(39 citation statements)

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“…A partir dos resultados, observa-se uma redução na intensidade do amortecimento e um aumento na temperatura de transição vítrea para os clones em relação à sua mistura, indicando que estes possuem uma menor mobilidade de suas cadeias, e que com a mistura obtém-se um material mais flexível. O comportamento apresentado pela mistura, mostrando melhor desempenho em relação ao módulo de armazenamento e a menor Tg também foi observado por outros autores [16,17] , que sugerem que este comportamento da borracha natural pode estar relacionado com o aumento da orientação das cadeias ou da viscosidade do material devido ao processamento realizado na sua obtenção.…”

Section: Resultsunclassified

Avaliação de clones de borracha natural crua por ensaios padrão e análise dinâmico-mecânica

et al. 2006

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Resumo: A qualidade do látex de borracha natural (Hevea brasiliensis) de diferentes clones (RRIM 600, IAN 873, GT 1, PB 235), uma mistura destes clones e uma borracha comercial foi avaliada por ensaios padrões (plasticidade Wallace, PRI, viscosidade Mooney, % de cinzas, extrato acetônico e % de nitrogênio), DMA, DSC e TG. As borrachas estudadas apresentam propriedades competitivas com as da borracha presente no mercado, ficando dentro dos padrões de qualidade exigidos pela norma brasileira e pelo padrão internacional. Entre os clones, o clone RRIM 600 foi o que apresentou o melhor desempenho, principalmente em relação à viscosidade Mooney e ao PRI. Palavras-chave: Borracha natural, clone, látex, análise térmica. Evaluation of Clones of the Raw Natural Rubber by Standard Test and Dynamic Mechanical PropertiesAbstract: Natural rubber (Hevea brasiliensis) from different clones (RRIM 600, IAN 873, GT 1, PB 235), a mixture made from these clones, and a commercial rubber, have been characterized by DMA, DSC, TGA, and standards methods (Wallace plasticity, PRI, Mooney viscosity, ash percentage, acetonic extract and nitrogen percentage). All the samples studied complied with standard specifications required for application in the rubber industry, and can be used in the rubber industry in blended or unblended forms. Among the clones, the best results of the standards methods were obtained from the RRIM 600 clone, and the blended form of the natural rubber increases its storage modulus.

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Section: Resultsunclassified

Avaliação de clones de borracha natural crua por ensaios padrão e análise dinâmico-mecânica

et al. 2006

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“…Measurement of glass transition temperature (T g ) is one of the most common approaches in studying the behavior of polymer blends (38)(39)(40). T g is the temperature at which the molecular chain of a polymer obtains sufficient energy to surmount the energy barrier for bond rotation (41). Consequently, the polymer changes from a frozen glass-like condition with very limited mobility to a totally mobile system that achieves thermodynamic equilibrium instantaneously.…”

Section: Thermal and Dynamic Mechanical Analysismentioning

confidence: 99%

Novel Film Modifiers to Alter the Physical Properties of Composite Ethylcellulose Films

2005

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“…DMTA is very sensitive to the curing process and isothermal experiments enable the development of an ideal curing schedule. [12] In this study, melamine-formaldehyde (MF) resins were mixed with four types of bio-scavengers: tannin powder, wheat flour, rice husk flour, and charcoal, to reduce formaldehyde emission. We investigated the effect of bio-scavengers on the thermal stability and dynamic mechanical properties during the curing process of MF resin and compared the resulting adhesion properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bio‐Scavengers on the Curing Behavior and Bonding Properties of Melamine‐Formaldehyde Resins

Kim

et al. 2006

Macro Materials & Eng

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Summary: The effects of bio‐scavengers on the formaldehyde emission, bonding strength, curing behavior, and thermal decomposition properties of MF resins for engineered flooring and adhesion for wood were investigated. Four varieties of bio‐scavengers, tannin powder, wheat flour, rice husk flour, and charcoal, were added to MF resin at 5 wt.‐%. To determine formaldehyde emission and bonding strength, we manufactured engineered floorings. MF‐charcoal was most effective in reducing formaldehyde emission because of its porous nature, but its bonding strength was decreased. Tannin powder and wheat flour, which contain more hydroxyl groups, showed higher bonding strength and curing degree than pure MF resin did. Although the hydroxyl groups of the bio‐scavengers were effective in reducing formaldehyde emission and improve bonding strength and curing degree, rice husk flour and charcoal behaved like inorganic substances, thereby disturbing the adhesion between MF resin and wood and thus reducing the bonding strength. In thermogravimetric analysis, MF‐tannin showed the highest thermal stability in the low‐temperature range from 100 to 300 °C.Storage modulus (E′) of MF resin with various bio‐scavengers at a heating rate of 10 °C · min−1.magnified imageStorage modulus (E′) of MF resin with various bio‐scavengers at a heating rate of 10 °C · min−1.

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Theory and application of dynamic mechanical thermal analysis

Cited by 66 publications

References 1 publication

Avaliação de clones de borracha natural crua por ensaios padrão e análise dinâmico-mecânica

Avaliação de clones de borracha natural crua por ensaios padrão e análise dinâmico-mecânica

Novel Film Modifiers to Alter the Physical Properties of Composite Ethylcellulose Films

Effect of Bio‐Scavengers on the Curing Behavior and Bonding Properties of Melamine‐Formaldehyde Resins

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