Rheological and extrusion behavior of intercalated high-impact polystyrene/organomontmorillonite nanocomposites

Chen, Dazhu; Yang, Haiyang; He, Pingsheng; Zhang, Weian

doi:10.1016/j.compscitech.2005.01.011

Cited by 49 publications

(24 citation statements)

References 32 publications

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“…On the other hand, when polymer-filler interaction is the driving factor, the viscoelasticity of the melt is controlled by the dynamics of the stick-slip motion of the polymer chains around the filler surface [17][18][19][20][21][22]. During the past few years, the linear viscoelastic behaviour in the molten state of polymer nanocomposites filled with organically modified clays has been widely investigated [23][24][25][26][27][28][29][30][31], and the subject has been reviewed by Krishnamoorti and Yurekli [26]. Studying the rheological response of polystyrene/clay nanocomposites, Zhao et al [30] found that the level of dispersion was markedly correlated with the rheological response.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Also, fractured and etched surface micrograph (Fig 6) exhibits almost the same dramatic decrease in size of more homogeneously distributed rubber domains to ca 2 m and even less than 1 m in the presence of nanolayers. Reduction in the domain size may be attributed to both the nano size directed domain morphology via reduction in the difference in melt viscosities of continuous polymer matrix and dispersed phase [23] resulting in improvement in the mixing properties gained by the presence of nanosilica layers, giving a sharper shear-thinning nature to the composites [24] as well as possible agglomeration of the compatible nanolayers around the EPDM particles and forming a diffused layer between PP and EPDM. More homogeneous dispersion of EPDM rubber domains with a smaller size in PPNC3 nanocomposite is probably due to the deposition of nanosized silica platelets selectively around the dispersed rubber phase as given by AFM image (Figure 7a) and disruption of the continuity of this discrete phase via shear thinning.…”

Section: Resultsmentioning

confidence: 99%

Weld line behaviour of exfoliated and toughened polypropylene layered silica nanocomposites

et al. 2011

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Exfoliated and toughened polypropylene nanocomposites prepared by an introduction of a rubber in the form of compatibilizer toughener: ethylene propylene diene based rubber grafted with maleic anhydride (EPDM-g-MAH) were studied in terms of weld line properties and morphology. Effects of addition of rubber and nanolayer on weld line strength under tensile loading condition of polypropylene matrix were investigated. Data showed that in the absence of either EPDM or nanolayers, a sharp decrease in weld line strength cannot be avoided whereas in the presence of each in optimum ratio, the drastic increase in both toughness and weld line strength values can be easily reached. The beneficial effect is believed to come from the selective placing of nanolayers around the rubber droplets and making them smaller in size which contributes to diffused weld line regions with high mechanical strength.

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“…PS-organoclay nanocomposites prepared by melt intercalation show an increase of Young's modulus at different contents of organoclay when compared with the modulus of the neat resin but a linear relationship between the amount of organoclay and Young´s modulus was not observed 17 . Natural zeolite 18 , alumina 19 , metal oxides 20,21 , organophilic modified layered silicates 22,23 , and single and multiwall carbon nanotubes 24,25 , have been used for the modification of virgin PS.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silica Nanoparticles on the Thermomechanical Properties of Recycled Polystyrene

Perez-Guerrero¹,

Lisperguer²,

Orellana³

2011

J. Chil. Chem. Soc.

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Polystyrene from packing materials (rPS) was reinforced with 1, 3 and 5 % of silica prepared by the sol-gel method, through a blending process . The thermal, morphological and mechanical properties were compared with those of the virgin polystyrene (PS). The results show that the glass transition temperature (Tg), storage modulus (E') and impact strength of the pure rPS and silica-rPS composites were higher than those of virgin PS. Thermogravimetric analysis revealed that the thermal stability of virgin PS was slightly greater than that of the rPS. The addition of silica to rPS increased their thermal stability to similar values of the virgin PS.SEM studies showed that the silica nanoparticles had an uniform size but its dispersion into the polymer matrix was not homogeneous. These results suggest that postconsumer PS can be used to obtain composite materials with good mechanical and thermal properties.

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Rheological and extrusion behavior of intercalated high-impact polystyrene/organomontmorillonite nanocomposites

Cited by 49 publications

References 32 publications

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

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

Weld line behaviour of exfoliated and toughened polypropylene layered silica nanocomposites

Influence of Silica Nanoparticles on the Thermomechanical Properties of Recycled Polystyrene

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