Cover Picture: Macromol. Mater. Eng. 3/2004

Granado, Ainhoa; Eguiazábal, J. I.; Nazábal, J.

doi:10.1002/mame.200490006

Cited by 17 publications

(34 citation statements)

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“…The behavior of the yield stress was almost linear, because the observed deviations were comparable with the standard deviation of the values. This is to be expected, because in polymer blends the deviations in the yield stress are usually 40,41 smaller than those of the elastic modulus.…”

Section: Mechanical Propertiesmentioning

confidence: 88%

Compatible polycarbonate/polyamide 6,6 blends with fibrillar morphology

Granado¹,

Eguiazábal²,

Nazábal³

2011

J of Applied Polymer Sci

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Blends of bisphenol A polycarbonate (PC) and polyamide 6,6 (PA6,6) were prepared directly during the plasticization step of an injection molding process in an attempt to attain both (i) the reinforcement of the blends through fibrillar morphology, and (ii) an adequate compatibilization despite the short processing procedure used. Differential scanning calorimetry and dynamic-mechanical analysis indicated that the blends were made up of a PC-rich phase where some PA6,6 was present and, ruling out a possible degradation, of an almost pure PA6,6-phase. The cryogenically fractured surfaces observed by scanning electron microscopy showed both rather fine particles and larger particles with occluded subparticles. This complex morphology indicates low interphase tension and, therefore, compatibilization, which can be attributed to the presence of PA6,6 in the two phases of the blends. The values of Young's modulus, determined by means of tensile tests, were always synergistic and, in the case of the 25/75 blend, the modulus was even higher than those of any of the two pure components. It appears this could be due to both the highly fibrillar morphology of the dispersed phase, and the significant decrease observed in specific volume. The blends remained ductile throughout the full composition range, which also indicates compatibilization.

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Section: Mechanical Propertiesmentioning

confidence: 88%

Compatible polycarbonate/polyamide 6,6 blends with fibrillar morphology

Granado¹,

Eguiazábal²,

Nazábal³

2011

J of Applied Polymer Sci

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“…Despite its recent development, it has already been blended with polyamide 6, [15,18,19] an amorphous polyamide, [17] poly(butylene terephthalate) (PBT) [16] and PET modified with PBT. [20] These experiments resulted in partially miscible blends with polyamide-6, PBT and PET modified with PBT, [15,16,20] and a practically immiscible blend with amorphous polyamide. [17] Moreover, interchange reactions have been observed in blends with amorphous polyamide [17] and PET-PBT.…”

Section: Discussionmentioning

confidence: 99%

“…[20] These experiments resulted in partially miscible blends with polyamide-6, PBT and PET modified with PBT, [15,16,20] and a practically immiscible blend with amorphous polyamide. [17] Moreover, interchange reactions have been observed in blends with amorphous polyamide [17] and PET-PBT. [20] Another poly(amino ether) resin has been used as compatibilizer for polyamide 6/PBT blends.…”

Section: Discussionmentioning

confidence: 99%

“…[17] Moreover, interchange reactions have been observed in blends with amorphous polyamide [17] and PET-PBT. [20] Another poly(amino ether) resin has been used as compatibilizer for polyamide 6/PBT blends. [21] Taking into account the high oxygen and CO 2 barrier properties of PAE, [3] it is an attractive material for blending with traditional packaging polymers like PET.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, due to the presence of lateral hydroxyl groups in their chemical structure, they are likely to establish specific interactions (hydrogen bonding) with polymers having proton-acceptor moieties, such as polyesters or polyamides. In fact, both partial miscibility [15,16] and mechanical compatibility, [15][16][17] have been observed in blends of these two kinds of polymers. The joint presence of lateral hydroxyl groups and ester or amide moieties also posses the possibility of the development of interchange reactions in the melt state, which can also compatibilize the blends.…”

Section: Introductionmentioning

confidence: 99%

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High Compatibility and Improved Barrier Performance in Blends Based on a Copolyester Modified with a Poly(amino ether) Resin

Granado

Eguiazábal

Nazábal

2006

Macro Materials & Eng

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Summary: The structure and properties of blends of a PCTG and a PAE resin obtained by direct injection molding have been studied. The blends were almost immiscible, and were composed of a nearly pure PAE phase and a mixed PCTG‐rich phase containing minor PAE amounts. Electron microscopy observations showed a high intermixing level between both components. The permeability data indicated an improved barrier protection of PCTG upon PAE addition. The Young's modulus and the yield stress of the blends followed a linear behavior with respect to composition, while values close or slightly below linearity were observed for the break properties. The combined effects of the small dispersed particle size and the proposed good interfacial adhesion are stated as the main factors responsible for the positive mechanical behavior. The impact strength showed an unexpected variability for PCTG‐rich blends, which is attributed to a ductile‐brittle transition of PCTG.Ductility of PCTG/PAE blends vs. composition.magnified imageDuctility of PCTG/PAE blends vs. composition.

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Structure and properties of a poly(amino ether) resin after reprocessing in the melt state

Granado

Eguiazábal

Nazábal

2006

J of Applied Polymer Sci

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ABSTRACT:The effects of reprocessing by extrusion for up to five cycles, at both the usual (200°C) and an extreme (230°C) temperature, on the structure and mechanical properties of a poly(amino ether) (PAE) resin were studied. A slight darkening and viscosity increase was observed, mainly upon reprocessing at 230°C. The melt flow index and solubility analysis indicated that grafting and crosslinking reactions took place, respectively, after reprocessing at 200 and 230°C. The YoungЈs modulus and the yield stress of PAE increased slightly with successive extrusion cycles. This was attributed to the viscosity-induced increase in orientation, and to a minor extent to the partially grafted/ crosslinked nature of the samples. The decrease in the ductility was more noticeable in the samples reprocessed at 230°C, and was attributed to the reduced ability to elongate of partially grafted and partially crosslinked structures present after reprocessing, respectively, at 200 and 230°C.

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Cover Picture: Macromol. Mater. Eng. 3/2004

Abstract: Cover: The picture on the cover shows the morphology of the skin of a 80/20 amorphous polyamide/poly(amino‐ether) blend.Further details can be found in the Full Paper by A. Granado, J. I. Eguiazábal,* and J. Nazábal on page 281.

Cited by 17 publications

References 0 publications

Compatible polycarbonate/polyamide 6,6 blends with fibrillar morphology

Compatible polycarbonate/polyamide 6,6 blends with fibrillar morphology

High Compatibility and Improved Barrier Performance in Blends Based on a Copolyester Modified with a Poly(amino ether) Resin

Structure and properties of a poly(amino ether) resin after reprocessing in the melt state

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