Sepiolite needle-like clay for PA6 nanocomposites: An alternative to layered silicates?

Bilotti, Emiliano; Zhang, R.; Deng, Hua; Quero, Franck; Fischer, Hartmut; Peijs, Ton

doi:10.1016/j.compscitech.2009.07.016

Cited by 135 publications

(83 citation statements)

References 42 publications

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“…These two nanofillers exhibit largely different shape/aspect ratio, and surface chemistry and it has been shown for nanocomposites based on PA 6 that, for these reasons, sepiolite has a higher reinforcing efficiency than MMT [42,43]. Similar observations were obtained in studies of properties of nanocomposites based on poly (lactic acid) and poly (-caprolactone) [44].…”

Section: Introductionsupporting

confidence: 73%

Crystallization kinetics of polyamide 11 in the presence of sepiolite and montmorillonite nanofillers

2016

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The crystallization kinetics of polyamide 11 (PA 11) in presence of sepiolite and organomodified montmorillonite nanofillers has been studied in a wide range of temperatures and cooling rates by conventional differential scanning calorimetry (DSC) and fast scanning chip calorimetry (FSC). The presence of the nanofillers has a negligible effect on the crystallization temperature of PA 11 at low cooling rates. However, at rapid cooling conditions a distinct nucleating effect of the nanofillers is detected. The critical cooling rate to suppress crystallization increases from 600 K s -1 to about 1000 and 3000 K s -1 in nanocomposites containing sepiolite and montmorillonite, respectively. Regardless the cooling rate applied for solidification the melt, in the nanocomposites the crystallinity of PA 11 is 5 to 10 % higher than in neat PA 11, with the highest values obtained for the montmorillonite-containing system. The nucleating effect of the nanofillers onto the crystallization of the PA 11 is confirmed by analysis of the half-times of isothermal crystallization, and by analysis of the spherulitic superstructure. All measurements proved a saturation of the nucleation efficiency at a loading of the nanofiller of 2.5 m%.

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Section: Introductionsupporting

confidence: 73%

Crystallization kinetics of polyamide 11 in the presence of sepiolite and montmorillonite nanofillers

2016

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“…The degree of crystallinity of PP matrix from nanocomposites tends to increase with Pal content, regardless of the surface treatment. PP/PP-g-MAH/Pal-1 shows lower values in the degree of crystallinity given that the Pal agglomerates reduce the concentration of active sites for nucleation [58]. Thus, the better dispersed Pal-2 and Pal-3 in nanocomposites act as effective nucleation agents, increasing slightly the degree of crystallinity.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Effect of Surface Modification of Palygorskite on the Properties of Polypropylene/Polypropylene-g-Maleic Anhydride/Palygorskite Nanocomposites

Cisneros-Rosado

Uribe-Calderón

2017

International Journal of Polymer Science

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The effect of surface modification of palygorskite (Pal) on filler dispersion and on the mechanical and thermal properties of polypropylene (PP)/polypropylene grafted maleic anhydride (PP-g-MAH)/palygorskite (Pal) nanocomposites was evaluated. A natural Pal mineral was purified and individually surface modified with hexadecyl tributyl phosphonium bromide and (3-Aminopropyl)trimethoxysilane; the pristine and modified Pals were melt-compounded with PP to produce nanocomposites using PP-g-MAH as compatibilizer. The grafting of Pal surface was verified by FT-IR and the change in surface hydrophilicity was estimated by the contact angle of sessile drops of ethylene glycol on Pal tablets. The extent of Pal dispersion and the degree of improvement in both the mechanical and thermal properties were related to the surface treatment of Pal. Modified Pals were better dispersed during melt processing and improved Young's modulus and strength; however, maximum deformation tended to decrease. The thermal stability of PP/PP-g-MAH/Pal nanocomposites was considerably improved with the content of modified Pals. The degree of crystallinity increased with Pal content, regardless of the surface modification. Surfactant modified Pal exhibited better results in comparison with silane Pal; it is possible that longer alkyl chains from surfactant molecules promoted interactions with polymer chains, thereby improving nanofiller dispersion and enhancing the properties.

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“…A remarkable change is observed for the Young's modulus, while a small amount of sepiolite is incorporated. The fact that sepiolite has little effect on the elongation at break of the EVA/MH/SP composites, but distinct effect on the Young's modulus probably ascribed to the complex interactions between the polar EVA and the silanol groups of the high aspect-ratio of the sepiolite [24]. Hydrogen bonding may also be expected to take part in between the ester groups of EVA and the characteristic silanol groups.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Synergistic flame retardant effects between sepiolite and magnesium hydroxide in ethylene-vinyl acetate (EVA) matrix

Huang¹,

Chen²,

Yi³

et al. 2010

Express Polym. Lett.

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Abstract. Some customers are reluctant to change, because the halogen-free solutions may have higher cost. This is one of the reasons that the synergistic effect is always the subject for researchers to pursue. The synergy between sepiolite and magnesium hydroxide (MH) in halogen-free flame retardant ethylene-vinyl acetate (EVA) copolymer was investigated in the paper through some common facilities, such as limiting oxygen index (LOI), UL-94 test, thermogravimetric analysis (TGA), differential thermal analysis (DTA) and cone calorimeter test (CCT). In the wake of the positive results from the LOI and UL-94 tests, the CCT data indicated not only the reduction of heat release rate (HRR) and mass loss rates (MLR), but also prolonged ignition time (TTI) and depressed smoke release (SR) were observed during combustion. Simultaneously, the tensile strength and Young's modulus of the system were also much better improved with the increase of sepiolite added due to the hydrogen bonds between silanol groups attached to the sepiolite molecules and the ester groups of EVA. The synergistic mechanism has been discussed in the paper in terms of the barrier mechanism in the condensed phase.

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Sepiolite needle-like clay for PA6 nanocomposites: An alternative to layered silicates?

Cited by 135 publications

References 42 publications

Crystallization kinetics of polyamide 11 in the presence of sepiolite and montmorillonite nanofillers

Crystallization kinetics of polyamide 11 in the presence of sepiolite and montmorillonite nanofillers

Effect of Surface Modification of Palygorskite on the Properties of Polypropylene/Polypropylene-g-Maleic Anhydride/Palygorskite Nanocomposites

Synergistic flame retardant effects between sepiolite and magnesium hydroxide in ethylene-vinyl acetate (EVA) matrix

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