Dynamic mechanical properties of sulfonated polystyrene/alumina composites

Cousin, Patrice; Smith, P.

doi:10.1002/polb.1994.090320307

Cited by 59 publications

(34 citation statements)

References 14 publications

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“…The segmental mobility in the composites varies continuously as the segments become more distant from a given filler particle, and this may be responsible for the observed behavior. 29 These data imply that the filler is located adjacent to the polybutadiene regions, and may enhance structuring, possibly explaining the relatively low percolation threshold of HIPS/CB compounds. 14 The loss moduli of reference samples of compression-molded UHMWPE and XL-UHMWPE are shown in Figure 10(b).…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 95%

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Breuer

Tzur

Narkis

et al. 1999

J. Appl. Polym. Sci.

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CB-containing HIPS/UHMWPE and HIPS/XL-UHMWPE are unique systems, in which structuring takes place, affecting the electrical (to be described in a future article), rheological, mechanical, and dynamical-mechanical properties. The XL-UHMWPE particles have undergone structural fixation due to the crosslinking, maintaining their porosity and internal intricate structure even after high-temperature melt processing, as opposed to the UHMWPE particles. Differences in the flow mechanisms of HIPS/UHMWPE and HIPS/XL-UHMWPE blends have been attributed to polymer viscous flow in the former case vs. particle slippage in the latter. The mechanical properties of HIPS/UHMWPE are enhanced when utilizing XL-UHMWPE as a dispersed phase, especially the strength, because of changes in the inherent properties of the UHMWPE following irradiation, and in particular, the nature of the HIPS/XL-UHMWPE interface. The results for the CB-containing 70HIPS/30XL-UHMWPE blend are especially surprising and of practical importance, due to the fact that no degradation of the mechanical properties has occurred as a result of the CB incorporation. The dynamical mechanical properties reflect the differences between the UHMWPE and XL-UHMWPE-containing blends as well. The presence of either type of UHMWPE, CB content, and blend composition affect the dissipation, but have only a minor influence on the transition temperatures of the components. Of special interest is the increased damping of XL-UHMWPE-containing compositions.

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Section: Dynamic Mechanical Propertiesmentioning

confidence: 95%

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Breuer

Tzur

Narkis

et al. 1999

J. Appl. Polym. Sci.

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“…The changes in properties result from the large surface to volume ratio of the nanoparticles (Cousin and Smith, 1994;Margolina and Wu, 1988). In composites, polymer chains surround filler particles and come into contact with the particle surface.…”

Section: Introductionmentioning

confidence: 99%

Microscopic measurement of the degree of mixing for nanoparticles in polymer nanocomposites by TEM images

Kim

Lee

Barry

et al. 2007

Microscopy Res & Technique

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For polymer nanocomposites, the small size of the fillers makes it difficult to analyze the degree of mixing quantitatively and often requires direct assessment via transmission electron microscopy (TEM). To date, qualitative comparisons and indirect measurements of the degree of mixing by measurement of certain properties are the most common methods. Better methods to quantitatively characterize the degree of mixing in nanocomposites would aid in studies investigating the effect of process conditions on the mixing behavior. Alumina/PET nanocomposites of identical composition, but with different degrees of mixing were prepared using a batch mixer. For evaluation of the degree of mixing with respect to both dispersion and distribution, three different techniques were applied and compared. TEM particle density was useful for dispersion, but did not adequately characterize distribution, while the Morisita's index gave poor results due to a wide range of effective particle sizes. Both methods ranked the samples differently compared to direct visual observation. In contrast, the skewness calculated by the quadrat method produced results consistent with visual rankings, and was found to be most effective in comparing and quantifying the degree of mixing. Although the quadrat method requires proper selection of quadrat size for a particular particle concentration, the skewness from the quadrat method was found to be most suitable as a standard index for the degree of mixing in nanocomposites. The usefulness of the quadrat method was verified using a second set of nanocomposites prepared by a twin screw extruder showing the potential for application of this technique for process development and quality control in commercial nanomanufacturing processes.

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“…In line with this the B-factors were slightly smaller for composites with APTMS/GPTMS than for these containing MTMS coated/uncoated particles ( Table 2). Lewis and Nielsen [33] attributed these changes to the enhanced interfacial interaction between the polymer matrix and the particles, whereas Cousin and Smith [34] associated these changes with a decrease in free volume and to strong interactions between the particles and the polymer, which result in an immobilized interfacial layer. A reduced chain mobility at the interface was a possible reason for the observed smaller damping peak when glass beads, incorporated in an epoxy matrix, was silane treated [35].…”

Section: Damping [Tan (D)]mentioning

confidence: 98%

Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

et al. 2014

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The rheological and dynamic mechanical properties of polymer-based composites of Sm 2 Co 17 and polyamide-12 with different particle loadings, sizes, and surface treatments are reported. Sm 2 Co 17 particles were surface-treated with three different silanes: 3-glycidoxy(propyl)trimethoxysilane, 3-amino(propyl)trimethoxysilane (APTMS), and methyltrimethoxysilane (MTMS). It was shown, for the composites with untreated particles, that the viscosity and storage modulus increased with increasing filler content (0-60 vol%) and decreasing filler particle size. In addition, the glass transition temperature increased significantly and the damping decreased with increasing filler content. Of the silanes, the MTMS, which yielded only a thin surface layer, had in general the least effect on the rheological properties of the composite. The composite containing the APTMS-coated filler showed the highest storage modulus. The results give new insights on how to prepare polymer-bonded magnets with optimal process conditions (rheology) and dynamic mechanical properties, by varying the amount of particles, their size, and surface treatment.

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Dynamic mechanical properties of sulfonated polystyrene/alumina composites

Cited by 59 publications

References 14 publications

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Microscopic measurement of the degree of mixing for nanoparticles in polymer nanocomposites by TEM images

Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

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