Crystallization behaviour of new poly(tetramethyleneterephthalamide) nanocomposites containing SiO2 fillers with distinct morphologies

Esteves, A. Catarina C.; Barros‐Timmons, Ana; Martins, José A.; Zhang, W.; Cruz-Pinto, J.J.C.; Trindade, Tito

doi:10.1016/j.compositesb.2004.04.005

Cited by 25 publications

(8 citation statements)

References 27 publications

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“…The dependence of B with the particle size and morphology and its concentration is displayed in Figure 8. A decrease in the value of B can be associated with a raise in the activation energy of the spherulite growth process as previously reported 26…”

Section: Resultssupporting

confidence: 70%

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Spherulite Growth Rate in Polypropylene/Silica Nanoparticle Composites: Effect of Particle Morphology and Compatibilizer

Palza

Vera

Wilhelm

et al. 2011

Macro Materials & Eng

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Spherical and tube‐like (TL) silica nanoparticles were melt blended with an isotactic polypropylene (PP) matrix and its effect on the isothermal spherulite growth rate was analyzed by polarized optical microscope. The addition of low amount (≈1 wt.‐%) of either 15 nm spherical or TL particles raises the spherulite growth rate and the nucleation density of spherulites. Samples prepared with silica spheres of 80 nm otherwise do not show any change in the crystallization behavior. By adding a compatibilizer, both the nucleation density and the spherulite growth rate of the pure polymer are increased. Noteworthy, although the nanoparticles do not further increase the nucleation density of the PP/compatibilizer blend, independent of its form and size, they cause a decrease in its spherulite growth rate.

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Section: Resultssupporting

confidence: 70%

“…These results show the strong effect of the particle morphology and size on the nucleation density of the PP, even if they are not well dispersed. The larger nucleating effect of TL silica particles than spherical particles (≈200 nm) has been recently reported for polyamide composites 26…”

Section: Resultsmentioning

confidence: 99%

Spherulite Growth Rate in Polypropylene/Silica Nanoparticle Composites: Effect of Particle Morphology and Compatibilizer

Palza

Vera

Wilhelm

et al. 2011

Macro Materials & Eng

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“…Many previous investigations20–26 showed that the particle size, content, and surface characteristics of silica nanoparticles are main factors that affect crystallization behavior of different semicrystalline polymers. Since degree and rate of crystallization affect main properties of semicrystalline polymers, our further aim in this article was to investigate influence of amount and type of silica filler on crystallization kinetics and melting of isothermally crystallized samples.…”

Section: Introductionmentioning

confidence: 99%

Influence of silica nanofiller on the isothermal crystallization and melting of polyurethane elastomer

Blagojević

Buhin

Igrec

2012

J of Applied Polymer Sci

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In this article, isothermal crystallization kinetic of the linear hydroxyl polyester urethane (PUR), as well as influence of amorphous silica nanofiller, was investigated. With the aim to investigate the influence of filler surface modification on the crystallization process of polyurethane matrix, nonmodified silica, as well as silica modified with methacrylsilane and octylsilane, were used as fillers for PUR composite preparation. The crystallization kinetics depending on temperature of the isothermal crystallization and volume fraction of filler by using differential scanning calorimetry (DSC) were investigated. The measurements at temperatures 7, 12, and 17°C for PUR and composites with 0.5, 1, 2, and 4 vol % of filler were done. Kinetic parameters of the isothermal crystallization n and K were determined according to Avrami model. Melting of the isothermally crystallized samples was also investigated. Results of the research indicate that by increasing the isothermal crystallization temperature, the crystallization rate of the PUR soft phase decreases and that the perfection of the crystallites is improved. By addition of all fillers up to ≈1 vol %, the crystallization rate increases; however, addition of a higher amount of the filler significantly decreases the crystallization rate. It was found that surface modification can significantly affect crystallization rate and that the nucleation efficiency of silica increases in the following order: methacrylsilane‐modified silica < nonmodified silica < octylsilane‐modified silica. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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“…Têm também sido descritas alterações da cristalização de matrizes poliméricas semicristalinas em nanocompósitos 31 . Por exemplo, em um material híbrido constituído por uma matriz de poli(tetrametileno tereftalamida) contendo fibras ou esferas de SiO 2 com dimensões nanométricas, foi registada uma influên-cia da morfologia das nanopartículas na cinética de cristalização da poliamida 32 . Em nanocompósitos de Bi 2 S 3 / Nylon(6,10) verificou-se que as nanofibras de Bi 2 S 3 actuam como sítios de nucleação, resultando em um número maior de esferulites no nanocompósito relativamente ao polímero puro (Figura 2) 33 .…”

Section: Cargas: Nanopartículas Inorgânicasunclassified

Nanocompósitos de matriz polimérica: estratégias de síntese de materiais híbridos

Esteves¹,

Barros‐Timmons²,

Trindade³

2004

Quím. Nova

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Recebido em 24/10/03; aceito em 5/2/04; publicado na web em 17/6/04 POLYMER BASED NANOCOMPOSITES: SYNTHETIC STRATEGIES FOR HYBRID MATERIALS. Associating the well known advantages of hybrid materials to the wide potential of nanomaterials, the new and featuring class of polymer nanocomposites turned into one of the most intensively researched areas. This review highlights recent developments in the field of the synthesis of polymer based nanocomposites. Important issues related to the surface modification of fillers, in order to promote the compatibility between the inorganic/organic components, are also reported. The enhancement of the physical properties and the potential applications of polymer nanocomposites are considered in typical examples, given for each synthetic method described.Keywords: nanocomposites; polymers; chemical synthesis. INTRODUÇÃOEncontramos na mitologia grega um dos registos mais antigos da existência de híbridos como seres prodigiosos e fantásticos que povoaram a imaginação dos humanos. O grifo, por exemplo, aliava a força de um corpo de leão à perspicácia e capacidade de voar conferida pela cabeça e asas de uma águia, resultando num temeroso guardião do templo dos Deuses (Figura 1) 1 . Na própria natureza existem materiais híbridos admiráveis, sintetizados através de processos quími-cos em meio aquoso, sob condições de pressão e temperatura ambientes, com mecanismos de "automontagem" envolvendo interacções electroestáticas, ligações de pontes de hidrogénio ou forças de van der Waals 2 . Alguns dos nanocompósitos que ocorrem na natureza apresentam uma arquitectura molecular e sinergia perfeitas entre os seus componentes. Alguns exemplos típicos são o nacre (revestimento das pérolas) que consiste em lamelas nanométricas de aragonite (CaCO 3 ) dispersas numa mistura de proteínas e polissacarídeos, os ossos, os dentes e as conchas de alguns moluscos, que apresentam propriedades mecânicas extraordinárias 2 . Talvez seguindo esta bioinspiração os investigadores começaram por estudar uma forma de reproduzir estas propriedades, tentando aproximar-se do nível de controlo da estrutura e propriedades dos compósitos naturais, numa tentativa de obter materiais avançados. A bio-mineralização é de facto um campo de investigação actual em grande desenvolvimento e com forte repercussão no campo dos materiais híbridos 3,4 . A tendên-cia actual na área dos nanocompósitos é a preparação de materiais em que a interacção entre os componentes ocorre à escala nanométrica ou molecular. Os nanocompósitos obtidos deste modo, apresentam propriedades distintas dos compósitos tradicionais, podendo ser estabelecidas no processo de síntese , tintas e revestimentos 9 e como materiais retardadores de chama 10 . Os nanocompósitos são materiais híbridos em que pelo menos um dos componentes tem dimensões nanométricas. Tal como acontece nos compósitos tradicionais, um dos componentes serve de matriz, na qual as partículas do segundo material se encontram dispersas. Os componentes de um nanocompósito podem ser de natureza...

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Crystallization behaviour of new poly(tetramethyleneterephthalamide) nanocomposites containing SiO2 fillers with distinct morphologies

Cited by 25 publications

References 27 publications

Spherulite Growth Rate in Polypropylene/Silica Nanoparticle Composites: Effect of Particle Morphology and Compatibilizer

Spherulite Growth Rate in Polypropylene/Silica Nanoparticle Composites: Effect of Particle Morphology and Compatibilizer

Influence of silica nanofiller on the isothermal crystallization and melting of polyurethane elastomer

Nanocompósitos de matriz polimérica: estratégias de síntese de materiais híbridos

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