Exfoliation and dispersion enhancement in polypropylene nanocomposites by in‐situ melt phase ultrasonication

Lee, E. C.; Mielewski, Deborah F.; Baird, R. J.

doi:10.1002/pen.20179

Cited by 87 publications

(49 citation statements)

References 34 publications

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“…Os resultados sugerem ainda, que o PP-g-MA facilitou a delaminação e a dispersão da argila na matriz de polipropileno, mas que em teores elevados o compatibilizante teria produzido um efeito lubrificante durante o processamento dos compósitos, não favorecendo uma esfoliação da argila. Resultados semelhantes foram observados por Morales et al [11] e Lee et al [12] ao avaliarem compósitos formados a base de argila organofílica, polipropileno e agente compatibilizante.…”

Section: Difração De Raios Xunclassified

Efeito do Co-Intercalante CIS-13-Docosenamida na Morfologia e Propriedades Mecânicas de compósitos Polipropileno/Argila Organofílica

Alves¹,

Barbosa²,

Angrizani³

et al. 2013

Polímeros

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PolyTech, Prospect CT, USAResumo: Compósitos de PP/argila/PP-g-MA/erucamida contendo 5% (em peso) de argila montmorilonita organofílica (Cloisite 20A), 5 e 15% de PP-g-MA como agente compatibilizante e 0, 0,5% e 1% de cis-13-docosenamida (erucamida) como agente co-intercalante, foram preparados por intercalação no estado fundido. Concentrados de argila e compatibilizantes foram processados em misturador interno e em seguida diluídos com a matriz de polipropileno em extrusora de dupla rosca corrotacional. Os compósitos foram caracterizados através das propriedades mecânicas, difração de raios X e microscopia óptica. Os resultados indicaram o efeito reforçante da argila organofilizada. A presença de co-intercalante aumentou significativamente a distância interlamelar da argila em todos os compósitos, em geral, não afetando notavelmente o comportamento mecânico dos compósitos. Por microscopia óptica foi possível observar o efeito dispersivo do perfil de rosca utilizado, que promoveu a quebra dos aglomerados de argila. Palavras-chave: Polipropileno, nanocompósitos, co-intercalante, propriedades mecânicas. Effect of CIS-13-Docosenamide Cointercalation on the Morphology and Mechanical Properties of Polypropylene/Organoclay CompositesAbstract: PP/organoclay/PP-g-MA/erucamide composites with 5% commercial organo-montmorillonite (Cloisite 20A), 5 and 15% maleated polypropylene as compatibilizer, and 0, 0.5 and 1% erucamide as a co-intercalating agent were prepared by melt intercalation. A masterbatch of compatibilizer and organoclay was compounded in an internal mixer and then diluted in the polypropylene matrix in a corotating twin-screw extruder. The compounds were characterized by x-ray diffraction, optical microscopy and mechanical properties. Results indicate that the organoclay acted as a reinforcer. Addition of the co-intercalating agent significantly increased the interlayer spacing of the clay, without notably affecting the mechanical behavior of the composites. Optical microscopy showed the dispersive effect of the screw profile used, which promoted the breaking of clay agglomerates.

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Section: Difração De Raios Xunclassified

Efeito do Co-Intercalante CIS-13-Docosenamida na Morfologia e Propriedades Mecânicas de compósitos Polipropileno/Argila Organofílica

Alves¹,

Barbosa²,

Angrizani³

et al. 2013

Polímeros

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“…The infrared spectrum for silica ( Figure 5) shows a band around 950 cm -1 , attributed to Si-O of silanol groups, and also shows strong absorptions at 1175 cm -1 and 809 cm -1 , assigned to the asymmetric and symmetric stretching of siloxane groups (Si-O-Si) [24] . The broad absorption band between 400 cm -1 and 3000 cm -1 corresponds to the vibrations of different basic types at the surface (Si-OH) [17,25] .…”

Section: Ftirmentioning

confidence: 99%

Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica

Santos

Tavares

2014

Polímeros

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Abstract:The goal of this work was to investigate the production and properties of hybrid materials based on poly(lactic acid) (PLA), employing microcrystalline cellulose (MCC) and organophilic silica (R972) as fillers. The composites were obtained by solution casting to form films. Each nanoparticle was incorporated at 3 wt. %, relative to the polymer matrix. In this experiment, four films were obtained (PLA, PLA/MCC, PLA/R972 and PLA/MCC/R972). The films properties were evaluated by X-ray diffractometry, nuclear magnetic resonance, Fourier transform infrared spectroscopy and mechanical properties. The results showed that each nanoparticle, added individually or both combined, had different effect on the final properties of the films. Microcrystalline cellulose can act as nucleating agent for the crystallization of PLA. Silica promoted an increase in rigidity, due to the strong intermolecular forces, while MCC addition promoted an increase in the molecular mobility of the polymeric chains. The PLA/MCC/R972 film showed the highest crystallinity degree and tensile modulus. This film presented a T 1 H value between both values found for PLA/MCC and PLA/R972 films. The results indicated that silica R972 could promote a decrease of the surface tension between PLA and cellulose.

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“…All chemicals and polymers used in this research were commercial products and they were used as received without further purification. The preparation of the nanocomposites was carried out by a solution blending method using o-xylene [27][28][29]. The amount of treated clay added was 1, 2 and 5 parts per hundred (phr) of the total weight of PP and PP-g-MA.…”

Section: Preparation Of Nanocompositesmentioning

confidence: 99%

Oxygen barrier property of polypropylene-polyether treated clay nanocomposite

Pannirselvam¹,

Genovese²,

Jollands³

et al. 2008

Express Polym. Lett.

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Abstract. Polypropylene (PP) nanocomposites were obtained by solution blending of polyether treated montmorillonite and PP, with a coupling agent of maleic anhydride grafted polypropylene (PP-g-MA). The composition of the inorganic clay was varied in 1, 2 and 5 phr (parts of clay per hundred of PP by mass) while films of the composites were obtained via compression molding. Wide-angle X-ray scattering (WAXS) showed nanocomposites in which silicate layers were exfoliated and intercalated with respect to the different clay ratios. The morphology and gas permeability of hybrids prepared with organoclay were compared. Morphological studies using transmission electron microscopy showed most clay layers were dispersed uniformly in the PP matrix. Some tactoids of agglomerated nanoparticles were detected, as clay content increased. The oxygen permeability for all the hybrids for clay loadings were reduced by 30% of the corresponding values for pure PP.

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Exfoliation and dispersion enhancement in polypropylene nanocomposites by in‐situ melt phase ultrasonication

Cited by 87 publications

References 34 publications

Efeito do Co-Intercalante CIS-13-Docosenamida na Morfologia e Propriedades Mecânicas de compósitos Polipropileno/Argila Organofílica

Efeito do Co-Intercalante CIS-13-Docosenamida na Morfologia e Propriedades Mecânicas de compósitos Polipropileno/Argila Organofílica

Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica

Oxygen barrier property of polypropylene-polyether treated clay nanocomposite

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