Surface modified fumed silicas for modern coatings

Ettlinger, Manfred; Ladwig, T.; Weise, A.

doi:10.1016/s0300-9440(00)00151-x

Cited by 41 publications

(14 citation statements)

References 2 publications

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“…These facts suggest that the system of nanocomposites are changed to isotropic and homogeneous state by shear force, and one of the cause of this result may be the existence of network structures due to the particle-particle interaction of fumed silicas in the PET nanocomposites, which can be collapsed by shear force. 7,8,10 However, these curves of loss tangent (tan δ) and Cole-Cole plot for nanocomposites prepared via in situ polymerization change more abnormally than those of nanocomposites prepared via direct melt compounding 11 at the same filler content of 2.0 wt%, and PET/MFS shows the most solidlike elastic properties in this study. These results can be explained by some possibilities: the network structure of filler increases because the dispersibility of all nanoparticles is very effectively improved by in situ polymerization, and MFS has more chance to form the structure than FS at the low frequency range and loss modulus (G") value because MFS has better dispersibility than FS on the PET matrix.…”

Section: Resultscontrasting

confidence: 62%

“…8 Thus, the silanol groups on its surface can be chemically modified into various methylsilyl groups to reduce the surface energy and the hydrophobic property could be obtained. 9, 10 Barthel 8 found that the particleparticle interaction of inorganic filler is heavily related with the polarity of liquid medium, and Chung et al 11 confirmed that the incorporation of the surface modified silica affect the dispersibility of silica in non-polar polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties ofin situ polymerized poly(ethylene terephthalate)/fumed silica nanocomposites

Hahm

Myung

2004

Macromol. Res.

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We have prepared poly(ethylene terephthalate) (PET) nanocomposites filled with two different types of fumed silicas, hydrophilic (FS) and hydrophobic (MFS) silicas of 7-nm diameter, by in situ polymerization. We then investigated the morphological changes, rheological properties, crystallization behavior, and mechanical properties of the PET nanocomposites. Transmission electron microscopy (TEM) images indicate that the dispersibility of the fumed silica was improved effectively by in situ polymerization; in particular, MFS had better dispersibility than FS on the non-polar PET polymer. The crystallization behavior of the nanocomposites revealed a peculiar tendency: all the fillers acted as retarding agents for the crystallization of the PET nanocomposites. The incorporation of fumed silicas increased the intrinsic viscosities (IV) of the PET matrix, and the strong particleparticle interactions of the filler led to an increased melt viscosity. Additionally, the mechanical properties, toughness, and modulus of the nanocomposites all increased, even at low filler content.

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Section: Resultscontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Preparation and properties ofin situ polymerized poly(ethylene terephthalate)/fumed silica nanocomposites

Hahm

Myung

2004

Macromol. Res.

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“…10 As a rule, the extent of property enhancement depends on factors such as nanoparticle size, size distribution, aspect ratio, degree of dispersion and orientation in the matrix, and the adhesion at the filler-matrix interface. [11][12][13][14][15] Extensive work has been done in polymer-clay nanocomposites and its application made commercial success in nylon 6. 16 -18 This can pave the way to develop various nanoparticle-filled polymer composites such as metal oxides, mineral powders, and carbon.…”

Section: Introductionmentioning

confidence: 99%

Effects of zinc oxide nanoparticles on the physical properties of polyacrylonitrile

Chae¹,

Kim²

2005

J of Applied Polymer Sci

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Polyacrylonitrile (PAN)/zinc oxide (ZnO) nanocomposites were prepared by solution mixing in dimethylacetamide, followed by film casting, and their physical properties were investigated. The heating scan of differential scanning calorimetry displayed only a single crystallization peak (T c ) without a melting peak, regardless of the presence of ZnO. The incorporation of ZnO nanoparticles decreased T c by 13°C, and increased the heat of crystallization by 18%. Further, it greatly improved the thermal stability of PAN, even at the ZnO content as low as 0.1 wt %. The nanocomposites showed the UV transmittance peak at 365 nm, whose intensity was increased as ZnO content was increased. The presence of ZnO did not produce new peak nor shift the peaks with respect to PAN in wide angle X-ray diffraction pattern. Introduction of a small amount of ZnO nanoparticles did not have notable effect on the tensile properties. However, 5 wt % loading of the nanoparticles increased the tensile modulus of PAN by 14.5% and decreased elongation at break dramatically. PAN nanocomposites with 5 wt % ZnO did not show any plateau region in stress-strain curve.

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“…Silica has also been successfully used to control the rheology of organic/inorganic hybrids, through research concerning storage modulus , shear thickening and thinning behavior , thixotropy, and yield point . In addition, silica particles can be used for reinforcement of polymer matrices to lower shrinkage on curing, to decrease the thermal expansion coefficients and to improve adhesion properties, mar (abrasion resistance) and corrosion resistances . Silica is valued in inkjet printing technology for its ability to speed up ink drying time and increase the edge definition of printed materials .…”

Section: Introductionmentioning

confidence: 99%

“…Silicon alkoxide and silica can be used in sol-gel processes to synthesize organic/inorganic composites [12,13]. Silica has also been successfully used to control the rheology of organic/inorganic hybrids, through research concerning storage modulus [14], shear thickening and thinning behavior [15,16], thixotropy, and yield point [17]. In addition, silica particles can be used for reinforcement of polymer matrices to lower shrinkage on curing, to decrease the thermal expansion coefficients [18] and to improve adhesion properties, mar (abrasion resistance) [19] and corrosion resistances [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of dielectric properties of composite materials pozzolan/DGEBA

et al. 2015

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The subject of composite materials with reinforced filler has been studied recently. This study to improve both the dielectric and structural characteristics of diglycidyl ether of bisphenol a (DGEBA) focused on the appropriate use (from 5% to 60 wt%) of pozzolan filler mechanically grinded to obtain a very fine particle size (Ø < 10 μm) and area surface of 23.5 m2 g−1. The dielectric properties were investigated at great filler concentrations by weight. Epoxy microcomposite samples with a good dispersion of nanoparticles in the epoxy matrix were prepared and experiments were performed to measure the capacitance (C), the electrical resistance (R), and impedance (Z) as a function of frequency (1 kHz–10 kHz). Measurements were made using dielectric spectroscopy over the temperature range 25–80°C. Using the scanning electron microscope (SEM), the morphologies and structure of the surface and fracture surfaces of Pozzolan/DGEBA composites were observed. POLYM. COMPOS., 38:324–331, 2017. © 2015 Society of Plastics Engineers

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Surface modified fumed silicas for modern coatings

Cited by 41 publications

References 2 publications

Preparation and properties ofin situ polymerized poly(ethylene terephthalate)/fumed silica nanocomposites

Preparation and properties ofin situ polymerized poly(ethylene terephthalate)/fumed silica nanocomposites

Effects of zinc oxide nanoparticles on the physical properties of polyacrylonitrile

Experimental study of dielectric properties of composite materials pozzolan/DGEBA

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