1,721,077 research outputs found
Dataset for: The Effect of Organoclay Loading and Matrix Morphology on Charge Transport and Dielectric Breakdown in an Ethylene-based Polymer Blend
No full textDataset supports the publication: Shaw, A. V., Vaughan, A., & Andritsch, T. The effect of organoclay loading and matrix morphology on charge transport and dielectric breakdown in an ethylene-based polymer blend. Journal of Materials Science. Readme is contained within the spreadsheet.
Article abstract: The effect of an organoclay on the electrical properties of a polymeric host is described. The matrix was composed of a blend of high and low density polyethylene, such that a wide range of different morphologies could be generated, to which an ethylene/(vinyl acetate) copolymer was added, to increase compatibility between the organoclay and the matrix and, thereby, improve the organoclay dispersion. The ratio between the compatibiliser and organoclay was found to be important in forming a well-dispersed system, as evinced by thermogravimetric analysis, X-ray diffraction and scanning electron microscopy, indicating the effectiveness of the chosen compatibilisation strategy. DC conductivity was found to be determined by the precise distribution of the organoclay throughout the system; changes in morphology and phase structure of the matrix polymer resulting from changes in imposed thermal history had little effect per se, but varying degrees of self-assembly of the organoclay facilitated by different residence times within the quiescent melt could result in changes in overall DC conductivity of several orders of magnitude. Consequent increases in DC conductivity led to reductions in DC breakdown strength, implying failure through some avalanche or thermal process. However, a monotonic increase in observed AC breakdown strength implies that the associated underlying failure process is then very different.</span
Linking the thermal, morphological and electrical properties of thermoplastic polymer composites containing an organoclay
No full textNew material discovery to meet a list of property specifications is both slow and costly, whereas combining known materials to achieve a composite displaying a variety of properties from the constituent parts is widely regarded to be more effective. Blending polymers together with the incorporation of a nano-clay to form a nanocomposite alters the thermal, mechanical and electrical properties in particular.This thesis investigates the ability to form composites and their resulting thermal, morphological and electrical properties. Within each material system, results of varying the relative ratio of their constituents will be investigated and a comment made on the compatibility of the constituents. The hypothesis being that, in each case, a link between these properties can be established such that understanding the interdependency can better inform future material development. The polymeric materials investigated include polyethylene, polypropylene, polystyrene and copolymers of ethylene and vinyl acetate
Dataset for 'The Dielectric Effect of Xylene on an Organoclay-Containing Composite'
No full textThe dataset supports the journal paper Shaw, A. V., Vaughan, A., & Andritsch, T. (2018). The Dielectric Effect of Xylene on an Organoclay-Containing Composite. IEEE Transactions on Dielectrics & Electrical Insulation.
These data were collected in addition to the data collected for the conference paper submitted in July 2018 with the same title. This journal paper combines some work from the conference paper with additional work to form a journal article. </span
The effect of organoclay loading and matrix morphology on charge transport and dielectric breakdown in an ethylene-based polymer blend
No full textThe effect of an organoclay on the electrical properties of a polymeric host is described. The matrix was composed of a blend of high and low density polyethylene, such that a wide range of different morphologies could be generated, to which an ethylene/(vinyl acetate) copolymer was added, to increase compatibility between the organoclay and the matrix and, thereby, improve the organoclay dispersion. The ratio between the compatibiliser and organoclay was found to be important in forming a well-dispersed system, as evinced by thermogravimetric analysis, X-ray diffraction and scanning electron microscopy, indicating the effectiveness of the chosen compatibilisation strategy. DC conductivity was found to be determined by the precise distribution of the organoclay throughout the system; changes in morphology and phase structure of the matrix polymer resulting from changes in imposed thermal history had little effect per se, but varying degrees of self-assembly of the organoclay facilitated by different residence times within the quiescent melt could result in changes in overall DC conductivity of several orders of magnitude. Consequent increases in DC conductivity led to reductions in DC breakdown strength, implying failure through some avalanche or thermal process. However, a monotonic increase in observed AC breakdown strength implies that the associated underlying failure process is then very different
The dielectric properties of PP-EVA-organoclay composites
No full textPolymer blend immiscibility is detrimental to dielectric applications. Herein we report on the use of an organoclay nanofiller as a compatibilizer to a polymer blend of polypropylene and a copolymer of ethylene and vinyl acetate. The organoclay is found to suppress phase separation of the blend, increase the electrical conductivity and permittivity of the composites, whilst simultaneously decreasing the DC breakdown strength
Dataset for: The Dielectric Properties of PP-EVA blends Compatibilised by an Organoclay
No full textThis document contains the raw data for the paper entitled "The Dielectric Properties of PP-EVA-Organoclay Composites" submitted to Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2019</span
Comparing the influence of organoclay on the morphology and dielectric properties of three thermoplastic polymers
No full textNanocomposites have been emerging as important materials for high voltage applications due to the influence conferred upon the polymer by the nano-filler. However, the formation of nanocomposites is frequently hindered by the incompatibility between the polymer and filler, resulting in poor dispersion of the nanofiller and creating an inhomogeneous and irreproducible material unsuitable for use. One method for achieving dispersion of the polar montmorillonite nano-clay in non-polar thermoplastics is through grafting organic moieties to the nano-clay via ionic exchange. The effects of adding such nano-clays to polyethylene, polypropylene and polystyrene in terms of dielectric breakdown behavior and frequency dependent permittivity are investigated and compared herein
On the influence of xylene on the dielectric response of an organoclay-containing nanocomposite
No full textThe dielectric effect, investigated using dielectric spectroscopy and DC dielectric breakdown strength measurements, of introducing xylene into a composite system containing polyethylene, a co-polymer of ethylene and vinyl acetate and an organoclay can be understood in light of X-ray diffraction data. Although organoclay alone changes the dielectric response of the polymer blend and xylene has little to no effect on the unfilled polymer blend, when both xylene and organoclay are present a synergistic response is revealed. This work was undertaken in order to examine the generality of the possible effects of labile, low molar mass impurities on electrical properties of comparable systems, which may be processed through solvent-based routes
The dielectric effect of xylene on an organoclay-containing composite
No full textThe influence of a non-polar solvent, xylene, on the electrical properties of a composite system containing polypropylene, copolymer ethylene/(vinyl acetate) and an organoclay has been considered since the synthesis of composites often involves a solvent. Although in isolation neither the organoclay nor the xylene has a marked effect on the dielectric response of the system, when combined synergistic effects can be seen. We interpret this in terms of solvent-mediated relaxation of amphiphilic compatibiliser moieties introduced into the organoclay to aid processability. These local relaxation processes appear to adversely affect the breakdown strength of the system, which is recoverable upon the removal of xylene from the system
Dataset for: Comparing the influence of organoclay on the morphology and dielectric properties of three thermoplastic polymers
No full textThis document contains the raw data for the paper entitled "Comparing the influence of organoclay on the morphology and dielectric properties of three thermoplastic polymers" submitted to Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2019</span
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