Structure development and crystallization behaviour of PP/nanoparticulate composite

Saujanya, C.; Radhakrishnan, S.

doi:10.1016/s0032-3861(01)00140-9

Cited by 195 publications

(125 citation statements)

References 29 publications

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“…A argila organofílica obtida conforme procedimento reportado em trabalhos anteriores [9,[14][15][16] foi caracterizada por DRX e FTIR, e os nanocompósitos caracterizados por DRX e MET, para determinação do espaçamento basal entre as camadas de argila e sua composição química, bem como verificar a formação do nanocompósito. As análises de DRX foram realizadas em aparelho XRD-6000 Shimadzu, utilizando-se radiação Kα do cobre (λ = 1,542 Å), tensão de 40 kV, corrente de 30 mA, varredura entre 2θ de 2 a 30° e velocidade de varredura de 2 °C/min.…”

Section: Caracterizaçõesunclassified

“…Nanocompósitos poliméricos compreendem uma classe de materiais onde substâncias inorgânicas de dimensões nanométricas, tais como argilas e outros minerais, são finamente dispersos dentro de uma matriz polimérica [9,10] . Os híbridos orgânico/inorgânico exibem melhores propriedades quando comparados com os polímeros puros ou aos compósitos convencionais, tais como maior módulo de elasticidade e resistência à tração, maior resistência a solventes e ao fogo e boas propriedades óticas, magnéticas e elétricas [11] .…”

Section: Introductionunclassified

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Propriedades Mecânicas e Reológicas de Nanocompósitos de Poliamida 6 com Argila Organofílica Nacional

Paz¹,

Leite²,

Araújo³

et al. 2013

Polímeros

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Resumo: Nanocompósitos de poliamida 6 com argila organofílica foram preparados pelo método de intercalação no estado fundido. Foram estudadas as propriedades reológicas e mecânicas de nanocompósitos com argila nacional. A argila utilizada foi tratada com o sal quaternário de amônio (Cetremide) e foi caracterizada por Espectroscopia no Infravermelho (FTIR) e difração de raios X (DRX). Os resultados evidenciaram a incorporação do sal na argila e sua organofilização. Para a obtenção dos nanocompósitos, foram preparados concentrados de PA6/argila (1:1) em (m/m) e estes foram adicionados na poliamida 6, em quantidade de 3% de argila no composto final, utilizando uma extrusora de rosca dupla corrotacional. Posteriormente, as amostras foram moldadas por injeção e caracterizadas por: reometria capilar, DRX, MET e ensaios mecânicos (tração e impacto). Os resultados de reometria capilar mostraram que a presença da argila organofílica na PA6 aumentou a viscosidade dos sistemas. Por DRX e MET, foi verificado que todos os sistemas apresentaram predominância de estrutura esfoliada. As propriedades mecânicas sob tração foram melhores do que as da poliamida 6. Palavras-chave: Nanocompósitos, poliamida 6, argila organofílica. Mechanical and Rheological Properties of Nanocomposites of Polyamide 6 with National OrganoclayAbstract: Nanocomposites of polyamide 6 with organoclay were prepared by melt intercalation and their rheological and mechanical properties were studied. The clay was treated with the quaternary ammonium salt (Cetremide) and characterized by Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The results showed the incorporation of salt in the clay and its organophilization. A master was prepared with PA6/clay (1:1) by weight and this was added to the pure polyamide 6 to reach the nominal proportion of 3% of clay, using a corrotacional twin screw extruder. The samples were molded by injection and characterized by: capillary rheometry, XRD, TEM and mechanical testing (tensile and impact). The results of capillary rheometry showed that the presence of organoclay in the PA6 increased the viscosity of the systems. With XRD and TEM, it was verified that all systems presented predominantly exfoliated structure. The tensile properties of the nanocomposites were better than those of pure polyamide 6.

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Section: Caracterizaçõesunclassified

Section: Introductionunclassified

Propriedades Mecânicas e Reológicas de Nanocompósitos de Poliamida 6 com Argila Organofílica Nacional

Paz¹,

Leite²,

Araújo³

et al. 2013

Polímeros

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“…A number of suggestions have been reported to add different substances acting as nucleating agents to PET in order to improve its applied or processing properties. The additives exert an influence on the rate of the crystallization process, its morphology, the spherulite size and its distribution and so the physical properties of final product [14][15][16]. The nucleating agents can be mainly divided into three kinds: inorganic additives, organic additives and polymers, the nucleating effect on PET crystallization depends on several aspects, such as the size and geometry of the particles, the surface structure and interfacial interactions with the polymer matrix [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of nucleating agents on crystallization kinetics of PET

Jiang¹,

Luo²,

Sun³

et al. 2007

Express Polym. Lett.

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Abstract. Effects of three nucleating agents concluding talc, sodium benzoate (SB) and an ionomer (Ion., Na + ) on crystallization of poly(ethylene terephthalate) (PET) were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM), the parameters of crystallization kinetics were obtained through Avrami and Ozawa equations. The fold surface free energy σe of pure PET and PET/nucleating agent blends was calculated by Hoffman-Lauritzen theory. The results indicate that the three kinds of nucleating agents increase the crystallization rate constant through promoting their nucleating effect for PET crystallization, among which SB is the best one with the same content. The crystallization mode of PET might shift from three-dimensional growth to two-dimensional growth by the addition of the nucleating agents. The values of σe of PET/nucleating agent blends are much less than that of pure PET, and PET/SB (99:1) blend has the least value of σe (18.2 mJ/m 2 ). The conclusion based on Hoffman theory is similar to the analysis by Avrami and Ozawa equations.

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“…5 Besides, the mentioned properties, improvements in nanocomposites can be achieved at a very low loading of the nanoscale inorganic component (<5 wt%), but traditional microcomposites usually require much higher loadings (25-40 wt%). 6 However, to achieve the mentioned positive effects of nanoparticles on properties, adequate dispersion of nanofillers within the polymeric matrix is required. However, different parameters like polymer type and morphology, type and size of nanofillers, the interaction of nanofillers with the polymeric matrix and its volume content could influence the characteristics of nanocomposites.…”

Section: 폴리머 제36권 제6호 2012년mentioning

confidence: 99%

Influence of TiO₂Nanoparticle Filler on the Properties of PET and PLA Nanocomposites

Farhoodi¹,

Dadashi²,

Mousavi³

et al. 2012

Polymer Korea

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Abstract:Two types of polymers were tested in this study; poly(ethylene terephthalate) (PET) as a synthetic example and poly(lactic acid) (PLA) as a natural polymer. DSC analyses showed that the use of nanofiller increased the degree of crystallinity (X c ) of both PET and PLA polymers, but the effect was more noticeable on PET nanocomposites. The crystallization of PLA and PET nanocomposites occurred at higher temperatures in comparison to neat polymers. According to dynamic mechanical-thermal analysis (DMTA), the damping factor of PET/TiO 2 nanoparticles decreased compared to the neat matrix, but for PLA nanocomposites the opposite trend was observed. Results of the mechanical test showed that for both PET and PLA nanocomposites, the most successful toughening effect was observed at 3 wt% loading of TiO 2 nanoparticles. SEM micrographs revealed uniform distribution of TiO 2 nanoparticles at 1 and 3 wt% loading levels. The results of WAXD spectra explained that the polymorphs of PLA and PET was not affected by TiO 2 nanoparticles. UV-visible spectra showed that TiO 2 nanocomposite films had high ultraviolet shielding compared to neat polymer, but there was significant reduction in transparency.

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Structure development and crystallization behaviour of PP/nanoparticulate composite

Cited by 195 publications

References 29 publications

Propriedades Mecânicas e Reológicas de Nanocompósitos de Poliamida 6 com Argila Organofílica Nacional

Propriedades Mecânicas e Reológicas de Nanocompósitos de Poliamida 6 com Argila Organofílica Nacional

Effect of nucleating agents on crystallization kinetics of PET

Influence of TiO₂Nanoparticle Filler on the Properties of PET and PLA Nanocomposites

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Structure development and crystallization behaviour of PP/nanoparticulate composite

Cited by 195 publications

References 29 publications

Propriedades Mecânicas e Reológicas de Nanocompósitos de Poliamida 6 com Argila Organofílica Nacional

Propriedades Mecânicas e Reológicas de Nanocompósitos de Poliamida 6 com Argila Organofílica Nacional

Effect of nucleating agents on crystallization kinetics of PET

Influence of TiO2Nanoparticle Filler on the Properties of PET and PLA Nanocomposites

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Product

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Influence of TiO₂Nanoparticle Filler on the Properties of PET and PLA Nanocomposites