Pub Date : 2008-10-26DOI: 10.1109/CEIDP.2008.4772919
N. Hussin, G. Chen
In this report the pulsed elcetroacoustic (PEA) technique was employed to examine the space charge pattern in acetophenone and alpha-methylstyrene soaked low-density polyethylene (LDPE) samples. The samples were stressed at three different voltages; 5 kV, 8 kV and 10 kV, and the charge patterns in the sample bulk were compared with that obtained from the clean LDPE. These chemicals are observed to assist the transportation of the charges in the sample bulk. Each of these chemicals is in favour of different charge polarity. It seems that acetophenone assists the transportation of negative charges meanwhile the transportation of positive charges is assisted by the alpha-methylstyrene. It is proposed that the chemicals provide shallow traps that aid the movement of the charges.
{"title":"The Effect of Acetophenone and alpha-Methylstyrene on the Space Charge Properties of Low Density Polyethylene","authors":"N. Hussin, G. Chen","doi":"10.1109/CEIDP.2008.4772919","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772919","url":null,"abstract":"In this report the pulsed elcetroacoustic (PEA) technique was employed to examine the space charge pattern in acetophenone and alpha-methylstyrene soaked low-density polyethylene (LDPE) samples. The samples were stressed at three different voltages; 5 kV, 8 kV and 10 kV, and the charge patterns in the sample bulk were compared with that obtained from the clean LDPE. These chemicals are observed to assist the transportation of the charges in the sample bulk. Each of these chemicals is in favour of different charge polarity. It seems that acetophenone assists the transportation of negative charges meanwhile the transportation of positive charges is assisted by the alpha-methylstyrene. It is proposed that the chemicals provide shallow traps that aid the movement of the charges.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75945997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-26DOI: 10.1109/CEIDP.2008.4772890
G. Gherbaz, G. Chen, A. Vaughan
This paper examines the effects of 1,3:2,4-dibenzylidene sorbitol (DBS), a low-molecular organic molecule, on the space charge distribution in polyethylene. Morphological studies of the blends show the presence of a DBS network in the host system. Avrami analysis shows an increase in the nucleation density of polyethylene with the nucleating agent. Accumulation of space charge is one of the main causes of failure for high voltage cables and it depends on many factors such as additives, materials and treatment. In the present study we investigate the effects of different quantities of DBS in a blend of polyethylene. The space charge response during a stressing period and decay after removal of the applied electric field were observed. The results show that space charge accumulations are dependent on the concentration of the nucleating agent. In particular, the decay in a sample with 0.3 % DBS indicates shallow traps, whilst samples containing 1 and 3 % DBS show evidence of deep trap charges.
{"title":"Polyethylene/Dibenzylidene Sorbitol: effect of composition on space charge of polymeric insulation systems","authors":"G. Gherbaz, G. Chen, A. Vaughan","doi":"10.1109/CEIDP.2008.4772890","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772890","url":null,"abstract":"This paper examines the effects of 1,3:2,4-dibenzylidene sorbitol (DBS), a low-molecular organic molecule, on the space charge distribution in polyethylene. Morphological studies of the blends show the presence of a DBS network in the host system. Avrami analysis shows an increase in the nucleation density of polyethylene with the nucleating agent. Accumulation of space charge is one of the main causes of failure for high voltage cables and it depends on many factors such as additives, materials and treatment. In the present study we investigate the effects of different quantities of DBS in a blend of polyethylene. The space charge response during a stressing period and decay after removal of the applied electric field were observed. The results show that space charge accumulations are dependent on the concentration of the nucleating agent. In particular, the decay in a sample with 0.3 % DBS indicates shallow traps, whilst samples containing 1 and 3 % DBS show evidence of deep trap charges.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78335038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-26DOI: 10.1109/CEIDP.2008.4772802
A. Beroual, L. Kebbabi
This paper is aimed at the study of the influence of the capacitive effects on the characteristics of creeping discharges propagating over solid/liquid interface namely the morphology, the density of branches, the final length and the electrical charge associated with this kind of discharges. The capacitive effects are investigated through the thickness and dielectric permittivity of solid insulator. Different solid insulating materials are investigated; the considered liquid is a mineral oil of naphtenic type. It's shown that the surface density of branches and the final lengths of discharges as well as the electrical charge increase when the dielectric constant of insulator is increased and/or the thickness of insulator is reduced indicating thus the implication of the capacitive effects.
{"title":"Influence of Capacitive Effects on the Characteristics of Creeping Discharges Propagating over Solid/Liquid Interfaces under Impulse Voltages","authors":"A. Beroual, L. Kebbabi","doi":"10.1109/CEIDP.2008.4772802","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772802","url":null,"abstract":"This paper is aimed at the study of the influence of the capacitive effects on the characteristics of creeping discharges propagating over solid/liquid interface namely the morphology, the density of branches, the final length and the electrical charge associated with this kind of discharges. The capacitive effects are investigated through the thickness and dielectric permittivity of solid insulator. Different solid insulating materials are investigated; the considered liquid is a mineral oil of naphtenic type. It's shown that the surface density of branches and the final lengths of discharges as well as the electrical charge increase when the dielectric constant of insulator is increased and/or the thickness of insulator is reduced indicating thus the implication of the capacitive effects.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87809566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772837
J. Dai, Z. Wang, P. Jarman
The creepage discharge on pressboard barriers is regarded as one of the failure modes for power transformers. In literature, extensive research has been carried out previously to investigate the nature of creepage discharges, while little work was done to study the creepage discharge on the aged transformer board. A literature survey will be given first to summarise the understanding of creepage discharges on cellulose/oil interfaces. The effects of the aging products like moisture and absorbed sediments on the characteristics of creepage discharges will be investigated.
{"title":"Moisture and Aging Effect on the Creepage Discharge Characteristics at the Oil/Transformer-board Interface under Divergent Field","authors":"J. Dai, Z. Wang, P. Jarman","doi":"10.1109/CEIDP.2008.4772837","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772837","url":null,"abstract":"The creepage discharge on pressboard barriers is regarded as one of the failure modes for power transformers. In literature, extensive research has been carried out previously to investigate the nature of creepage discharges, while little work was done to study the creepage discharge on the aged transformer board. A literature survey will be given first to summarise the understanding of creepage discharges on cellulose/oil interfaces. The effects of the aging products like moisture and absorbed sediments on the characteristics of creepage discharges will be investigated.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73826518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772853
P. Sreejaya
Partial Discharge (PD) measurement and characterization provide vital information on insulation condition, different aspects of insulation ageing useful for equipment integrity verification and diagnosis. The PD denotes the Life vs. Stress characteristics of the material. The PD phenomenon is manifested as observable electric pulses. The work demonstrates the principle of PD measurement with the aid of an Off-line test arrangement. This paper investigates on the PD Inception and Extinction Voltage and determines the apparent charge, discharge energy and power dissipation for discharge quantity at a specified voltage. PD detection and measurement procedures suitable for use on Surge Arresters, Current Transformers and Insulators are examined.
{"title":"Study of Solid Dielectric Degradation Using Partial Discharge Test","authors":"P. Sreejaya","doi":"10.1109/CEIDP.2008.4772853","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772853","url":null,"abstract":"Partial Discharge (PD) measurement and characterization provide vital information on insulation condition, different aspects of insulation ageing useful for equipment integrity verification and diagnosis. The PD denotes the Life vs. Stress characteristics of the material. The PD phenomenon is manifested as observable electric pulses. The work demonstrates the principle of PD measurement with the aid of an Off-line test arrangement. This paper investigates on the PD Inception and Extinction Voltage and determines the apparent charge, discharge energy and power dissipation for discharge quantity at a specified voltage. PD detection and measurement procedures suitable for use on Surge Arresters, Current Transformers and Insulators are examined.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73346192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772825
R. Schwarz, T. Judendorfer, M. Muhr
To ensure economic operation of high voltage equipment, reliable condition evaluation concepts are essential. They enable long-term inspection strategies with regard to a maximized service life of each component. Condition based maintenance (CBM) is therefore desirable and it is already used more and more in practice. Monitoring and diagnostic systems are on the way to get important tools for modern high voltage units or electrical equipment. With the help of modern monitoring techniques, it is possible to record and process significant parameters which is helpful for diagnostics. The quantity and magnitude of partial discharges (PD) are major quality characteristics in the assessment of high voltage equipment. For the PD measurements, different physical effects can be utilized, such as electrical, optical, acoustic, chemical and high-frequency effects. Therefore, in addition to the conventional PD measurements (according to IEC 60270), depending on the electrical equipment, a multiplicity of different alternative methods are currently being used. At the same time a distinction between on-and off-line measurements is possible. For new high voltage equipment, the direct integration of sensors for PD detection during production is practical as this enables the possibility of on-line measurements and furthermore a permanent operation monitoring. This paper deals with different possibilities for on- and off-line PD measurements in variety of electrical equipment. Moreover, new methods to measure and detect PD and the influence of interferences at on-site measurements are discussed.
{"title":"Review of Partial Discharge Monitoring techniques used in High Voltage Equipment","authors":"R. Schwarz, T. Judendorfer, M. Muhr","doi":"10.1109/CEIDP.2008.4772825","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772825","url":null,"abstract":"To ensure economic operation of high voltage equipment, reliable condition evaluation concepts are essential. They enable long-term inspection strategies with regard to a maximized service life of each component. Condition based maintenance (CBM) is therefore desirable and it is already used more and more in practice. Monitoring and diagnostic systems are on the way to get important tools for modern high voltage units or electrical equipment. With the help of modern monitoring techniques, it is possible to record and process significant parameters which is helpful for diagnostics. The quantity and magnitude of partial discharges (PD) are major quality characteristics in the assessment of high voltage equipment. For the PD measurements, different physical effects can be utilized, such as electrical, optical, acoustic, chemical and high-frequency effects. Therefore, in addition to the conventional PD measurements (according to IEC 60270), depending on the electrical equipment, a multiplicity of different alternative methods are currently being used. At the same time a distinction between on-and off-line measurements is possible. For new high voltage equipment, the direct integration of sensors for PD detection during production is practical as this enables the possibility of on-line measurements and furthermore a permanent operation monitoring. This paper deals with different possibilities for on- and off-line PD measurements in variety of electrical equipment. Moreover, new methods to measure and detect PD and the influence of interferences at on-site measurements are discussed.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75296996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772775
A. Sami, M. Frechette, É. David, S. Savoie
The presence of water in insulating solids is known to affect the dielectric properties. Although relaxation processes evolved with the excitation frequency and temperature, further characteristics unfold when contaminant with a high dielectric constant, such as water is involved. When the material consists of a microcomposite, and especially in the advent of incorporation of nanofillers, it is speculated that water molecules may intervene in several different manners. In order to investigate further the potential digression caused by water, dielectric spectroscopy was used on prepared composite specimen. Different types of epoxy microcomposites exhibiting a high content of quartz, i.e. 60% wt., were prepared. The effects due to the variation of the water content and presence of nanostructures (nanoclay) on the dielectric response will be discussed. With a weight intake of 0.2% of water, the capacity of the epoxy microcomposite exhibits a slight increase (2%) at lower frequencies and losses are found to increase while a shift towards higher frequencies occurs.
{"title":"Water as a Digression Relative to the Dielectric Response in the Frequency Domain for Polymer Composites","authors":"A. Sami, M. Frechette, É. David, S. Savoie","doi":"10.1109/CEIDP.2008.4772775","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772775","url":null,"abstract":"The presence of water in insulating solids is known to affect the dielectric properties. Although relaxation processes evolved with the excitation frequency and temperature, further characteristics unfold when contaminant with a high dielectric constant, such as water is involved. When the material consists of a microcomposite, and especially in the advent of incorporation of nanofillers, it is speculated that water molecules may intervene in several different manners. In order to investigate further the potential digression caused by water, dielectric spectroscopy was used on prepared composite specimen. Different types of epoxy microcomposites exhibiting a high content of quartz, i.e. 60% wt., were prepared. The effects due to the variation of the water content and presence of nanostructures (nanoclay) on the dielectric response will be discussed. With a weight intake of 0.2% of water, the capacity of the epoxy microcomposite exhibits a slight increase (2%) at lower frequencies and losses are found to increase while a shift towards higher frequencies occurs.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74840553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772895
Lily Zhang, S. Boggs, S. Livanos
Utilities continue to experience electrically induced manhole events. Eighty-five percent of manhole events are caused by insulation breakdown, and 97% of the breakdowns occur on secondary cable insulation. The vast majority of manhole events involve only smoke, but a very small minority involve more serious phenomena. The restrictive conditions under which secondary cable insulation breakdown leads to dangerous manhole events needs to be understood. To approach this issue, thermal decomposition of secondary cable insulation was investigated in a simulated duct environment. Sustained decomposition is achieved under both aerobic and anaerobic conditions. The consequences of insulation degradation as a function of temperature with varying oxygen concentration has been monitored using a residual gas analyzer, and the thermal decomposition rate of the cable dielectric has been measured using TGA. Based on this investigation, we are approaching an understanding of the restrictive conditions which lead to serious manhole events.
{"title":"Manhole Events Caused by Secondary Cable Insulation Breakdown","authors":"Lily Zhang, S. Boggs, S. Livanos","doi":"10.1109/CEIDP.2008.4772895","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772895","url":null,"abstract":"Utilities continue to experience electrically induced manhole events. Eighty-five percent of manhole events are caused by insulation breakdown, and 97% of the breakdowns occur on secondary cable insulation. The vast majority of manhole events involve only smoke, but a very small minority involve more serious phenomena. The restrictive conditions under which secondary cable insulation breakdown leads to dangerous manhole events needs to be understood. To approach this issue, thermal decomposition of secondary cable insulation was investigated in a simulated duct environment. Sustained decomposition is achieved under both aerobic and anaerobic conditions. The consequences of insulation degradation as a function of temperature with varying oxygen concentration has been monitored using a residual gas analyzer, and the thermal decomposition rate of the cable dielectric has been measured using TGA. Based on this investigation, we are approaching an understanding of the restrictive conditions which lead to serious manhole events.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84565970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772918
Byung-Seol Lee, J. Jeong, C. Park, I. Song
Because of environmental friendly and higher fire point, Natural ester fluids are widely used for transformer cooling materials. Natural ester has higher viscosity than that mineral oil. Top oil temperature and hottest temperature will be warmer when using natural ester fluid in transformers designed for conventional transformer oil. Although natural ester has less influence on deterioration of cellulose paper than mineral oil, an increased hottest temperature might have an effect on the aging of insulating paper in coil winding. When comparing natural ester with mineral oil at the same designed transformers up to 500 kVA. The deviation of hottest temperature between the two is increased with load. For preventing additional aging of insulation paper, design changes are required when substituting natural ester for conventional transformer oil.
{"title":"The Characteristics of Winding Temperature for the Natural Ester Filled Transformer up to and Including 500 kVA","authors":"Byung-Seol Lee, J. Jeong, C. Park, I. Song","doi":"10.1109/CEIDP.2008.4772918","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772918","url":null,"abstract":"Because of environmental friendly and higher fire point, Natural ester fluids are widely used for transformer cooling materials. Natural ester has higher viscosity than that mineral oil. Top oil temperature and hottest temperature will be warmer when using natural ester fluid in transformers designed for conventional transformer oil. Although natural ester has less influence on deterioration of cellulose paper than mineral oil, an increased hottest temperature might have an effect on the aging of insulating paper in coil winding. When comparing natural ester with mineral oil at the same designed transformers up to 500 kVA. The deviation of hottest temperature between the two is increased with load. For preventing additional aging of insulation paper, design changes are required when substituting natural ester for conventional transformer oil.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73616407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772823
M. Reading, A. Vaughan
The topic of nanodielectrics is one that has grown enormously in importance since Lewis first introduced the concept of a nanodielectric in 1994. However, while nanodielectrics exhibit great promise, changes in macroscopic physical properties are determined by dispersion, and therefore it is imperative that reliable methods are available for the cost-effective determination of the dispersion state of the nanofiller in the host polymeric matrix. This paper details an investigation into the rheological response of PEO / montmorillonite (MMT) nanocomposites; MMT is a polar material and is therefore relatively compatible with aqueous systems. Three molecular weight PEOs were used - 100,000 g mol-1, 400,000 g mol-1 and 1,000,000 g mol-1. The rheological behaviour of a range of systems containing various levels of MMT were then studied, with the twin objectives of (a) producing materials with different shear histories and different degrees of MMT dispersion for study as described elsewhere and (b) to explore rheological response as a practical means of determining the dispersion state of a nanofiller in a liquid polymer. This would have great practical utility as a quality control device in, for example, the production of epoxy-based nanodielectrics. In this paper we concentrate on the latter aspect of the work and describe the effect of polymer molar mass, polymer concentration, imposed shear history and nanofiller loading level on the rheological behaviour of the system.
自从Lewis于1994年首次提出纳米电介质的概念以来，纳米电介质的主题就变得越来越重要。然而，虽然纳米电介质表现出巨大的前景，但宏观物理性质的变化是由分散决定的，因此，必须有可靠的方法来经济有效地确定纳米填料在主体聚合物基质中的分散状态。本文详细研究了PEO /蒙脱土(MMT)纳米复合材料的流变响应;MMT是一种极性材料，因此与水性体系相对兼容。使用了三种分子量的peo: 100,000 g mol-1、400,000 g mol-1和1,000,000 g mol-1。然后研究了包含不同水平MMT的一系列系统的流变行为，有两个目标:(a)生产具有不同剪切历史和不同程度MMT分散的材料，用于其他地方描述的研究;(b)探索流变响应作为确定纳米填料在液体聚合物中分散状态的实用手段。这将有很大的实际用途，作为质量控制装置，例如，环氧基纳米电介质的生产。在本文中，我们集中在工作的后一个方面，并描述聚合物摩尔质量，聚合物浓度，施加剪切历史和纳米填料加载水平对系统流变行为的影响。
{"title":"Dispersion and Rheology of Poly(ethylene oxide) / MMT Nanocomposites","authors":"M. Reading, A. Vaughan","doi":"10.1109/CEIDP.2008.4772823","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772823","url":null,"abstract":"The topic of nanodielectrics is one that has grown enormously in importance since Lewis first introduced the concept of a nanodielectric in 1994. However, while nanodielectrics exhibit great promise, changes in macroscopic physical properties are determined by dispersion, and therefore it is imperative that reliable methods are available for the cost-effective determination of the dispersion state of the nanofiller in the host polymeric matrix. This paper details an investigation into the rheological response of PEO / montmorillonite (MMT) nanocomposites; MMT is a polar material and is therefore relatively compatible with aqueous systems. Three molecular weight PEOs were used - 100,000 g mol-1, 400,000 g mol-1 and 1,000,000 g mol-1. The rheological behaviour of a range of systems containing various levels of MMT were then studied, with the twin objectives of (a) producing materials with different shear histories and different degrees of MMT dispersion for study as described elsewhere and (b) to explore rheological response as a practical means of determining the dispersion state of a nanofiller in a liquid polymer. This would have great practical utility as a quality control device in, for example, the production of epoxy-based nanodielectrics. In this paper we concentrate on the latter aspect of the work and describe the effect of polymer molar mass, polymer concentration, imposed shear history and nanofiller loading level on the rheological behaviour of the system.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76407559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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