Improved performance of isotactic polypropylene/titanium dioxide composites: Effect of processing conditions and filler content

Mina, Forhad; Seema, Sharmin; Matin, Rummana; Rahaman, Jellur; Sarker, Rama Bijoy; Gafur, M. A.; Bhuiyan, A.H.

doi:10.1016/j.polymdegradstab.2008.11.006

Cited by 88 publications

(11 citation statements)

References 18 publications

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“…This behavior has been previously reported in the case of an oriented PP sample, suggesting that the specimen possesses a highly oriented lamellar structure in terms of its crystalline morphology [32]. Compared to the virgin PP film, no distinctive difference in the diffraction angles is found for the PP/TiO 2 composite films, except for an additional peak appearing at around 27°, which is a characteristic reflection of the TiO 2 particles [33], indicating that the incorporation of the TiO 2 particles does not change the crystal form of the PP matrix. Moreover, the diffraction peak of (111/041) planes is still relatively weak compared to other diffraction peaks for these composite films.…”

Section: Resultssupporting

confidence: 79%

Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching

et al. 2017

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Abstract:In this work, a blending strategy based on compounding the hydrophilic titanium dioxide (TiO 2 ) particles with the host polypropylene (PP) pellets, followed by the common membrane manufacture process of melt extruding/annealing/stretching, was used to improve the polarity and thus electrolyte uptake capability of the PP-based microporous membranes. The influence of the TiO 2 particles on the crystallinity and crystalline orientation of the PP matrix was studied using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and infrared dichroic methods. The results showed that the TiO 2 incorporation has little influence on the oriented lamellar structure of the PP-based composite films. Investigations of the deformation behavior indicated that both the lamellar separation and interfacial debonding occurred when the PP/TiO 2 composite films were subjected to uniaxial tensile stress. The scanning electron microscopy (SEM) observations verified that two forms of micropores were generated in the stretched PP/TiO 2 composite membranes. Compared to the virgin PP membrane, the PP/TiO 2 composite membranes especially at high TiO 2 loadings showed significant improvements in terms of water vapor permeability, polarity, and electrolyte uptake capability. The electrolyte uptake of the PP/TiO 2 composite membrane with 40 wt % TiO 2 was 104%, which had almost doubled compared with that of the virgin PP membrane.

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Section: Resultssupporting

confidence: 79%

Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching

et al. 2017

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“…On the other hand, Mina et al , investigated the effect of processing conditions and filler content of TiO 2 . They showed the presence of three crystalline forms, when the δ‐phase is generally developed during pressure crystallization of isotactic PP.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, a significant attention has been given to polymer nanocomposites organic/inorganic materials . Organic/inorganic nanocomposites can join the simple properties of polymer and inorganic materials (nanoparticle) as well as bring specific advantages that can potentially lead to extensive improvement in mechanical properties, thermal barrier, and flammability .…”

Section: Introductionmentioning

confidence: 99%

Isothermal crystallization kinetics and morphology of PP/TiO₂ nanocomposites using titanium n‐butoxide precursor

Silva

Oliveira

2014

Polymer Composites

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This study investigates the influence of the addition of TiO2, obtained by hydrolysis–condensation reaction of titanium dioxide precursors, on the kinetics of polypropylene (PP) isothermal crystallization. The dispersion of nanoparticle and its relation to the degree of crystallinity by XRD was also investigated. The results indicated that the addition of the TiO2 increased the degree of crystallinity of PP and its crystallization temperature. Likewise, the nucleation and crystal growth processes were also affected, as indicated by the TEM morphology, the Avrami kinetic model, and the optical microscopy, in which a nucleation effect was detected. POLYM. COMPOS. 36:517–526, 2015. © 2014 Society of Plastics Engineers

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“…Além disso, o reprocessamento das blendas associado ao método P2 pode promover uma inicial termodegradação durante as próprias operações de extrusão mais acentuada do que nas blendas derivadas do método P1, que sofreram apenas uma etapa de extrusão. Nas blendas com a variação da porcentagem de TiO 2 , pode-se notar, na Tabela 6, que a adição de TiO 2 promoveu aumento na estabilidade térmica das blendas quando se usa a temperatura de degradação a perda em massa de 50% (T 50 ) como parâmetro [10] . Este comportamento foi observado também por outros estudos [11,12] em sistemas parecidos.…”

Section: Análise Termogravimétricaunclassified

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

2014

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Resumo: O polipropileno (PP) tem uma degradação natural lenta e representa um importante constituinte na gestão dos resíduos sólidos, enquanto o poli(hidroxibutirato) (PHB) é um polímero biodegradável, mas tem as desvantagens de dificuldade de processamento e custo. O objetivo deste trabalho foi avaliar o efeito de nanopartículas de TiO 2 , do método de processamento e do envelhecimento acelerado na estrutura e propriedades da mistura PP/PHB/TiO 2 . As amostras foram produzidas por etapas de extrusão e injeção e foram caracterizadas por MEV/EDS, FTIR e análise térmica. Os resultados mostraram que a incorporação de 3% de nanopartículas de TiO 2 levou a um aumento do tamanho médio da fase dispersa rica em PHB. A mudança na sequência da adição de nanopartículas de TiO 2 permitiu guiar a incorporação desses nanocomponentes para a fase rica em PP. As misturas produzidas se mostraram mais estáveis termicamente do que PHB puro e a adição de TiO 2 foi eficaz em aumentar a estabilidade térmica dos compósitos. As análises termogravimétricas e por FTIR mostraram que blendas contendo nanopartículas de TiO 2 tiveram sua degradação mais afetada nos ensaios de envelhecimento acelerado. Os ensaios de extração com solvente mostraram que um maior conteúdo de produtos de fotodegradação puderam ser extraídos de amostras contendo mais elevadas concentrações de TiO 2 . Palavras-chave: Polipropileno(PP), poli(hidroxibutirato) (PHB), compósitos, TiO 2 . Effect of the Incorporation of TiO 2 Nanoparticles on the Behavior of Polypropylenepoly(hydroxybutyrate) Blends Submitted to Accelerated Aging TestsAbstract: Polypropylene (PP) has a slow natural degradation rate. On the other hand, poly(hydroxybutyrate) (PHB) is biodegradable but has the disadvantages of cost and difficulty of processing. The aim of this work was to evaluate the effect of TiO 2 nanoparticles, processing conditions and accelerated aging on the structure and properties of PP/PHB/ TiO 2 mixtures. Samples were prepared by extrusion and injection molding. The incorporation of 3% TiO 2 nanoparticles led to an increase in the average size of the dispersed phase rich in PHB. Changes in the sequence of TiO 2 nanoparticles incorporation were able to guide the inclusion of nanoparticles to the PP-rich phase. The produced composites were more thermally stable than pure PHB and the incorporation of TiO 2 was effective to increase the thermal stability of the composites. Thermal and FTIR analyses showed that blends containing TiO 2 nanoparticles had their degradation more affected by accelerated aging treatments. Solvent extraction results revealed that a larger amount of soluble products from the photodegradation could be extracted from samples containing TiO 2 submitted to accelerated aging treatments.

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Improved performance of isotactic polypropylene/titanium dioxide composites: Effect of processing conditions and filler content

Cited by 88 publications

References 18 publications

Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching

Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching

Isothermal crystallization kinetics and morphology of PP/TiO₂ nanocomposites using titanium n‐butoxide precursor

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

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Improved performance of isotactic polypropylene/titanium dioxide composites: Effect of processing conditions and filler content

Cited by 88 publications

References 18 publications

Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching

Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching

Isothermal crystallization kinetics and morphology of PP/TiO2 nanocomposites using titanium n‐butoxide precursor

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

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Isothermal crystallization kinetics and morphology of PP/TiO₂ nanocomposites using titanium n‐butoxide precursor