Homogeneous composites of ultrahigh molecular weight polyethylene and minerals. 1. Synthesis

Howard, Edward G.; Lipscomb, Robert D.; MacDonald, Robert N.; Glazar, Barbara L.; Tullock, C. W.; Collette, John W.

doi:10.1021/i300003a004

Cited by 27 publications

(23 citation statements)

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“…These composites were prepared by a special method: the filler particles were surface treated by a polymerization catalyst; subsequently ethylene gas was polymerized onto the surface of the filler [2]. Composites of this type are denoted "homogeneous" because even at high filler content (50-70 wt %) there is strong adhesion between the matrix and the filler; agglomeration of filler particles is less pronounced than in conventionally prepared mechanical mixtures.…”

Section: Methodsmentioning

confidence: 99%

“…Composites of this type are denoted "homogeneous" because even at high filler content (50-70 wt %) there is strong adhesion between the matrix and the filler; agglomeration of filler particles is less pronounced than in conventionally prepared mechanical mixtures. The improved mechanical properties of these composites [3] are believed to be due to a special kind of grafting; the titanium catalyst is covalently bonded to the polymer chains and is ionically bound to the crystal lattice of the filler. Composites containing 48.1 wt % filler, and 62.5 wt % filler were studied.…”

Section: Methodsmentioning

confidence: 99%

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Dielectric properties of moist CaCO3 filled polyethylene composites

Bánhegyi

Karasz

1987

Colloid & Polymer Sci

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Abstract:The capacitance and the dielectric loss tangents of CaC03 filled polyethylene composites were studied. Composite samples, prepared by polymerizing ethylene on the surfaces of fillers, pre-treated by polymerization catalysts, were compared to normal mechanical mixtures. Dielectric dispersion, e', and loss, e", proved to be sensitive to heating or vacuum treatment. Investigation of samples under conditions of different relative humidities showed that the dielectric dispersion is due to adsorbed water. Both e' and e" increased with decreasing frequency and the ratio of loss and dispersion was nearly constant. Dielectric data measured at different relative humidities could be represented by a single Cole-Cole plot. Samples soaked in water for different periods yielded qualitatively similar but quantitatively different Cole-Cole plots. Composite samples showed higher losses at similar humidities.Possible interpretations in terms of a molecular relaxation model, an interracial relaxation model, including a charged double layer mechanism, percolation theory and the universal response theory were examined, but none was able to fully explain the observed phenomena.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dielectric properties of moist CaCO3 filled polyethylene composites

Bánhegyi

Karasz

1987

Colloid & Polymer Sci

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“…The crystal structure of the filler was essentially destroyed by calcination above 400°C, so that the hydrated water was removed and, therefore, the surface catalytic activity was improved. 10 Of all mineral fillers except mica, Kaolin has the highest surface area. 11 The filler weight content (W) was varied from 0.235 to 0.542 (i.e., from 0.10 to 0.30 in volume content).…”

Section: Experimental Materialsmentioning

confidence: 99%

Composition-dependent properties of polyethylene/kaolin composites. i. degree of crystallinity and melting behavior of polyethylene

Привалко

Pedosenko

Privalko

et al. 1999

J. Appl. Polym. Sci.

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Injection-molding and blow-molding grades of high-density polyethylene composites containing up to 30 vol. % of calcinated Kaolin were characterized by measurements of melting temperatures (T m ), heats of fusion (⌬H m ) and room-temperature densities. Both T m and the degree of crystallinity of a polymer matrix proved essentially unchanged regardless of filler content and/or presence of a custom coupling agent.

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“…11 Another approach relies on the chemical modification of the filler surface by functional silanes and titanate esters, which are able to promote adhesion to polymers. 6,7,12,13 In addition to these two rather complex and expensive techniques, Enikolopian 14 and Howard and coworkers [15][16][17][18][19] developed polymerization-filling techniques. They involve attaching a Ziegler-Natta catalyst to the surface of an inorganic filler so that olefin can be polymerized from the filler surface; 20 -23 this allows very high filler loadings (up to 95 vol %) to be reached together with acceptable mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical characterization of the filler–matrix interface in elastomer‐encapsulated fly ash/polyester particulate composites

Guhanathan

Devi

2005

J of Applied Polymer Sci

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An attempt was made to improve the toughness of fly ash (FA)/general-purpose unsaturated polyester resin (GPR) composites. Elastomer [styrene-butadiene rubber (SBR) or acrylic copolymer (AC)]-encapsulated fillers (FA or CaCO 3 ) were made through the coagulation of the emulsified elastomer containing the filler with constant stirring. The elastomer-encapsulated fillers were added to GPR at concentrations as high as 15 wt % to make FA/SBR or AC/GPR composites. The mechanical properties (i.e., the tensile strength, tensile modulus, tensile elongation, flexural strength, flexural modulus, impact strength, and hardness) of FA/GPR, FA/SBR/GPR, and FA/AC/GPR composites were studied. The tensile-fractured surfaces of all the composites were studied with scanning electron microscopy. The thermal stability was studied with thermogravimetric analysis. An analysis of the results indicate that this modification technique is rather easy and more economical than the chemical modification of filler surfaces with functional silane coupling agents.

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Homogeneous composites of ultrahigh molecular weight polyethylene and minerals. 1. Synthesis

Cited by 27 publications

References 0 publications

Dielectric properties of moist CaCO3 filled polyethylene composites

Dielectric properties of moist CaCO3 filled polyethylene composites

Composition-dependent properties of polyethylene/kaolin composites. i. degree of crystallinity and melting behavior of polyethylene

Physicochemical characterization of the filler–matrix interface in elastomer‐encapsulated fly ash/polyester particulate composites

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