Rheology studies on highly filled nano-zirconia suspensions

Renger, C.; Kuschel, P.; Kristoffersson, Annika; Clauß, Bernd; Sigmund, Wolfgang M.

doi:10.1016/j.jeurceramsoc.2006.08.022

Cited by 30 publications

(28 citation statements)

References 7 publications

(3 reference statements)

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“…A strong G′ enhancement can be easily detected even at relatively low silica content (Φ > 2 vol%), especially in the low frequency region. These observations are in agreement with the existing scientific literature on the rheological properties of nanoparticles filled systems [1,28,29,32,33,38,54]. It is important to underline that G′ of nanocomposites tends to become frequency independent in the low frequency region, which is the characteristic behaviour of an elastic solid (solid-like behaviour).…”

Section: Rheological Measurementssupporting

confidence: 90%

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Dorigato¹,

Pegoretti²,

Penati³

2010

Express Polym. Lett.

106

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Abstract. Linear low-density polyethylene (LLDPE) based composites were prepared by melt compounding with 1, 2, 3 and 4 vol% of various kinds of amorphous silicon dioxide (SiO2) micro-and nanoparticles. Dynamic rheological tests in parallel plate configuration were conducted in order to detect the role of the filler morphology on the rheological behaviour of the resulting micro-and nanocomposites. A strong dependence of the rheological parameters from the filler surface area was highlighted, with a remarkable enhancement of the storage shear modulus (G′) and of the viscosity (η) in fumed silica nanocomposites and in precipitated silica microcomposites, while glass microbeads only marginally affected the rheological properties of the LLDPE matrix. This result was explained considering the formation of a network structure arising from particle-particle interactions due to hydrogen bonding between silanol groups. A detailed analysis of the solid like behaviour for the filled samples at low frequencies was conducted by fitting viscosity data with a new model, based on a modification of the original De Kee-Turcotte expression performed in order to reach a better modelling of the high-frequency region.

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Section: Rheological Measurementssupporting

confidence: 90%

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Dorigato¹,

Pegoretti²,

Penati³

2010

Express Polym. Lett.

106

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“…Furthermore, a significative enhancement in G# is generally observed. These changes are usually assigned to a pseudo solid-like transition caused by the dispersed nanoparticles [40][41][42][43][44][45][46]. Nevertheless, the lowering of both |"*| and G# by BA addition to LLDPE contradicts such general trend.…”

Section: Rheological Behaviormentioning

confidence: 99%

Viscoelastic behaviour and fracture toughness of linear-low-density polyethylene reinforced with synthetic boehmite alumina nanoparticles

Pedrazzoli¹,

Ceccato²,

Karger‐Kocsis³

et al. 2013

Express Polym. Lett.

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Abstract. Aim of the present study is to investigate how synthetic boehmite alumina (BA) nanoparticles modify the viscoleastic and fracture behaviour of linear low-density polyethylene. Nanocomposites containing up to 8 wt% of untreated and octyl silane-functionalized BA nanoparticles, were prepared by melt compounding and hot pressing. The BA nanoparticles were finely and unformly dispersed within the matrix according to scanning electron microscopy inspection. The results of quasi-static tensile tests indicated that nanoparticles can provide a remarkable stiffening effect at a rather low filler content. Short term creep tests showed that creep stability was significatively improved by nanofiller incorporation. Concurrently, both storage and loss moduli were enhanced in all nanocomposites, showing better result for surface treated nanoparticles. The plane-stress fracture toughness, evaluated by the essential work of fracture approach, manifested a dramatic increase (up to 64%) with the BA content, with no significant differences among the various types of BA nanoparticles.

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“…The nature and characteristics of nanoparticles result in very high viscosity suspensions for solid contents often lower than 20 wt.%. [4][5][6][7] The high excluded volume around the particles originating from the electric double layer or polymer layer adsorbed onto the surface to prevent agglomeration due to van der Waals attractive forces is one potential cause for high viscosity. Another reason for the high viscosity of the nanoparticle suspensions in the increase in electrolyte concentration associated with the high surface area of high volume fraction nanoparticle suspensions.…”

Section: Introductionmentioning

confidence: 99%