Novel aspects of the microstructure of PP/PA blends prepared by reactive compounding as studied by microhardness

Fritz, H.‐G.; Cai, Q.; Cagiao, M. E.; Giri, Lily; Calleja, F. J. Baltá

doi:10.1007/bf00349873

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…It is noteworthy that the present values are much lower than those reported in the literature for non-annealed samples, i.e., 90 MPa for nylon 6, 18 80 -120 MPa for nylon 66, 19,20 or 152 MPa for the injection molded materials. 12 At the moment, we have no explanation for the small hardness values found in the present study.…”

Section: Structure and Microhardness Of The Homopolymerscontrasting

confidence: 64%

“…7 Although microhardness has been widely used in the characterization of many polymer systems, 8 -10 still its application to polyamides is relatively scarce. [11][12][13] The aim of this work is to investigate the effect of both annealing temperature and uniaxial mechanical drawing on the structure and the mechanical properties of nylon 6 and nylon 66 blends. In the first part of the work, we will show the influence of the annealing temperature on the properties of two series of filaments constituted by nylon 6 and nylon 66 homopolymers, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Structure-microhardness correlation in blends of nylon 6/nylon 66 monofilaments

Cagiao

Ania

Calleja

et al. 2000

J. Appl. Polym. Sci.

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ABSTRACT:The microstructure (crystallinity, long spacing) and the micromechanical properties (microhardness H) of two series of nylon 6 and nylon 66 monofilaments and their blends were investigated as a function of annealing temperature T A and uniaxial deformation in a wide composition range. In case of the homopolymers, the gradual rise of microhardness with T A is interpreted in the light of the increasing values of the crystallinity ␣ and the hardness of the crystals H c . The depression of the hardness values of the blends from the additive behavior of the hardness of individual components is discussed in the basis of the crystallinity depression of one component by the second one and viceversa. Finally, the influence of drawing and pressing the blends at 130°C which leads to a hardness increase is also explained in the light of an increase in the H c value of nylon 66 due to orientation.

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Section: Structure and Microhardness Of The Homopolymerscontrasting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Structure-microhardness correlation in blends of nylon 6/nylon 66 monofilaments

Cagiao

Ania

Calleja

et al. 2000

J. Appl. Polym. Sci.

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Hardness

Calleja¹,

Flores²

2001

Encyclopedia of Polymer Science and Technology

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Hardness is related to the resistance to local deformation of a material surface when indented, drilled, sawed, or abraded. Hardness is shown to be a mechanical property that provides a rapid evaluation of variations in polymer microstructure and morphology. Recent results concerning the microhardness of semicrystalline polymers and amorphous polymers relating to their structure are reviewed. The hardness of polymer glasses is first discussed in relation to their glass‐transition temperature. The development of structure during crystallization of glassy polymers as revealed by microhardness is brought up, and the hardness dependence on structural parameters such as the degree of crystallinity and the crystalline lamellar thickness is discussed. The close existing relationship between crystal hardness and melting temperature is presented. The correlation between microhardness of polymers and macroscopic mechanical properties (yield stress and Young's modulus) is highlighted. Some applications of the microhardness technique to polymer blends are also illustrated. In case of uniaxially oriented polymers, the indentation anisotropy is shown to provide information of the elastic response of the material along chain direction. Finally, the present review presents a comprehensive summary of the different methods used for the determination of hardness numbers, stressing the correlation between the hardness values resulting from different indenter geometries.

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Relationship between interfacial tension and dispersed‐phase particle size in polymer blends. II. PP/PA6

Shariatpanahi

Nazokdast

Hemmati

2003

J of Applied Polymer Sci

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ABSTRACT:Simple blends with different viscosity ratios of the components as well as compatibilized blends varying both in type and content of the compatibilizers were used to study the relation between the interfacial tension and the dispersed-phase particle size for PP/PA6 (80/20 wt %) blends in this work. Four compatibilizing systems including poly(ethylene-co-methacrylic acid) ionomers, a maleic anhydride-grafted propylene copolymer, maleic anhydridegrafted polypropylene, and a maleic anhydride-grafted styrene ethylene butylene copolymer were used. For blends prepared in an internal mixer, a power-law relation was found between the capillary number and the torque ratio of the blends' components. This relation was used to estimate the interfacial tension for the compatibilized blends. The relation between the steady-state torque of the blends as a measure of viscosity and the estimated values of interfacial tension were also investigated.

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Novel aspects of the microstructure of PP/PA blends prepared by reactive compounding as studied by microhardness

Cited by 7 publications

References 14 publications

Structure-microhardness correlation in blends of nylon 6/nylon 66 monofilaments

Structure-microhardness correlation in blends of nylon 6/nylon 66 monofilaments

Hardness

Relationship between interfacial tension and dispersed‐phase particle size in polymer blends. II. PP/PA6

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