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6th International Symposium on Electrets,(ISE 6) Proceedings.最新文献

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Polarization behaviour of iodine-doped polystyrene 掺碘聚苯乙烯的极化行为
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38572
R. Singh, S. Nayak, J. Keller, S. Datt
{"title":"Polarization behaviour of iodine-doped polystyrene","authors":"R. Singh, S. Nayak, J. Keller, S. Datt","doi":"10.1109/ISE.1988.38572","DOIUrl":"https://doi.org/10.1109/ISE.1988.38572","url":null,"abstract":"Thermally stimulated currents (TSCs) from iodine-doped polystyrene (PS) thermoelectrets have indicated that the polarization is due to the localization of an injected charge in geometrically and energetically distributed traps. Anomalous TSCs, observed with strongly doped samples, are considered to be due to the release of injected space-charge carriers and the partial blocking of the metal-polymer contact. As the number of shallow traps with small detrapping increases with increasing dopant concentration, the space-charge density will be relatively greater in room-temperature-charged samples with strong doping than in samples charged at this temperature with weaker doping.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133879415","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}
引用次数: 0
Dosimetry at interfaces: measurements by polypropylene electrets at and near plane interfaces between different materials (C, Al, Cu, Sn, Pb) irradiated with cobalt 60 gamma rays 界面剂量测定:用聚丙烯驻极体在不同材料(C、Al、Cu、Sn、Pb)之间的平面界面及其附近用钴60伽马射线辐照进行测量
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38610
P.-N. Martin
{"title":"Dosimetry at interfaces: measurements by polypropylene electrets at and near plane interfaces between different materials (C, Al, Cu, Sn, Pb) irradiated with cobalt 60 gamma rays","authors":"P.-N. Martin","doi":"10.1109/ISE.1988.38610","DOIUrl":"https://doi.org/10.1109/ISE.1988.38610","url":null,"abstract":"The electret surface charge density sigma deposited by a corona effect is a function of the gamma photon exposure. The relative variations of sigma =q/q/sub 0/ are a function of the ionization created in the air cavity which contains the electret (if the initial and final charges of the electret are q/sub 0/ and q). A multilaminar system made with two materials (metal and carbon) allowed measurements to be made of the ionization relative to the carbon at all points. The same evolution was obtained with a traditional ionization chamber used under the same experimental conditions. The results show that significant variations in dose distributions occur at high photon energy where the mass energy absorption coefficients differ relatively little from one material to another. The enhancement or reduction in ionization becomes very sensitive to the direction of the incident photon beam. The energy deposited in a material is enhanced when it is next to one of lower atomic number, provided the gamma beam penetrates the lower atomic number material first. A reversal in beam direction reduces the ionization to a level below that which it could be for either material alone.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131672370","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}
引用次数: 1
Thermally stimulated processes in organic polymers 有机聚合物中的热刺激过程
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38535
R. Fleming
{"title":"Thermally stimulated processes in organic polymers","authors":"R. Fleming","doi":"10.1109/ISE.1988.38535","DOIUrl":"https://doi.org/10.1109/ISE.1988.38535","url":null,"abstract":"Emerging trends in the interpretation of measurements of thermally stimulated conductivity, luminescence, and depolarization in organic polymers are reviewed, in the context of charge trapping and transport. Particular attention is given to the following: (1) the advantage of making simultaneous measurements on the same sample; (2) the determination of the forms of quasicontinuous distributions of trap activation energies; and (3) the use of thermally stimulated processes to monitor aging (degradation) of polymeric insulants in power distribution cables and hence estimate their economic service lifetimes.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129935681","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}
引用次数: 6
Electron-beam poling of very thin PVDF and VDF-TrFE copolymer films 极薄PVDF和VDF-TrFE共聚物薄膜的电子束极化
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38527
D. Schilling, S. Schuler, K. Dransfeld
{"title":"Electron-beam poling of very thin PVDF and VDF-TrFE copolymer films","authors":"D. Schilling, S. Schuler, K. Dransfeld","doi":"10.1109/ISE.1988.38527","DOIUrl":"https://doi.org/10.1109/ISE.1988.38527","url":null,"abstract":"A novel method of electron-beam poling of very thin (d approximately=100 nm) polyvinylidenefluoride (PVDF) and vinylidenefluoride-trifluoroethylene copolymer (VDF-TrFE) films, cast from solution on a well-polished metal substate, is presented. The penetrating electron beam passes through the thin polymer film, and its main energy dissipates inside the metal support. Due to the secondary electron emission from the film surface a positive surface potential is left on the polymer, producing a poling field toward the grounded metal substrate. Using a chopped electron beam (E/sub 0/=5 keV to 30 keV) poling patterns have been created on the film. These polarized regions, having a lateral resolution in the submicron range, are subsequently imaged in the scanning electron microscope at low beam intensity using the potential contrast method. The mechanism for the generation of contrast is discussed.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122311881","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}
引用次数: 0
A mathematical model to study the influence of space charges in a needle-plane-arrangement in a polymer 研究空间电荷对聚合物针状平面排列影响的数学模型
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38530
H. Dopper
{"title":"A mathematical model to study the influence of space charges in a needle-plane-arrangement in a polymer","authors":"H. Dopper","doi":"10.1109/ISE.1988.38530","DOIUrl":"https://doi.org/10.1109/ISE.1988.38530","url":null,"abstract":"In polymeric insulating materials, tree-initiated breakdown is supported by space charge. A mathematical model is developed to study the influence of space charge on the field strength of a needle-plane arrangement. The model examines carrier injection at the metal-polymer contact. The movement of the charge carriers is dependent on field strength, temperature, and carrier mobility. The effects of electrons and holes were neglected. The effectiveness of the method is illustrated by examples of thermally stimulated currents.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121379712","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}
引用次数: 1
The analysis of thermally stimulated current of pig bone 猪骨的热刺激电流分析
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38645
Zhu Yafei, W. Zonghan, Xu Fudong
{"title":"The analysis of thermally stimulated current of pig bone","authors":"Zhu Yafei, W. Zonghan, Xu Fudong","doi":"10.1109/ISE.1988.38645","DOIUrl":"https://doi.org/10.1109/ISE.1988.38645","url":null,"abstract":"A peak of 10/sup -8/ A was found at 75 degrees C in the TSC (thermally stimulated current) spectrum of crude bone. This peak disappeared in the second cycle of a TSC experiment performed immediately after the first cycle. It reappeared after the sample was exposed to the atmosphere for a few days. When the sample was turned over, the direction of the peak was not changed. After the sample was dried completely, the peak at 75 degrees C disappeared. Another peak, which was much smaller than the peak at 75 degrees C, appeared around 95 degrees C, and its direction could not be reversed by turning the sample over. X-ray diffraction and infrared absorption were used as complementary analysis techniques. It is concluded from these experiments that the larger peak originated from the free water and the smaller one is due to crystallization water, keratin and peptide, etc.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116780929","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}
引用次数: 0
Surface flashover and surface deterioration of polymer insulations in vacuum 真空中聚合物绝缘材料的表面闪络和表面劣化
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38578
T.D. Eish, F. Youssef
{"title":"Surface flashover and surface deterioration of polymer insulations in vacuum","authors":"T.D. Eish, F. Youssef","doi":"10.1109/ISE.1988.38578","DOIUrl":"https://doi.org/10.1109/ISE.1988.38578","url":null,"abstract":"Results are presented of investigations carried out to record the various factors affecting the surface flashover strength across perspex (PMMA) and Teflon (TFP) insulators in a vacuum. The factors studied include the dependence of flashover AC and DC voltage stresses on sample length and field conditions. The influence of the number of sequential flashovers on the magnitude of flashover voltage and on the surface deterioration of the polymer samples in vacuum is also examined. Under an ultimate pressure of 0.1 Pa the flashover voltage for perspex is always higher than that of Teflon. Thus the DC flashover voltage values are higher than those of AC values, whereby the negative polarity flashover voltage is higher than that of the positive polarity. The flashover voltage increases in general with increased sample length, so the flashover voltage values under nonuniform fields are higher than those under uniform field conditions. The flashover voltage decreases after about 35 flashovers; such a number of flashovers causes treelike eroded paths on the insulating surface, thus leading to a marked decrease of flashover voltage value.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114459280","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}
引用次数: 0
Effect of mechanical deformations on thermally stimulated currents in polymers. I. Uniaxially cold-drawn polycarbonate 机械变形对聚合物中热刺激电流的影响。1、单轴冷拔聚碳酸酯
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38536
G. Yianakopoulos, J. Vanderschueren, J. Niezette
{"title":"Effect of mechanical deformations on thermally stimulated currents in polymers. I. Uniaxially cold-drawn polycarbonate","authors":"G. Yianakopoulos, J. Vanderschueren, J. Niezette","doi":"10.1109/ISE.1988.38536","DOIUrl":"https://doi.org/10.1109/ISE.1988.38536","url":null,"abstract":"The thermally stimulated depolarization and polarization current (TSDC and TSPC) methods have been used to study the intermediate relaxation induced in polycarbonate by uniaxial cold drawing at various drawing ratios and rates. No spontaneous polarization resulting from molecular orientation or internal stress was evidenced by current measurements under zero bias voltage. The intermediate alpha ' relaxation was generated in TSPC and subsequent TSDC experiments, but its properties were markedly different in the two types of spectra. In TSPC measurements, the molecular mechanism responsible for the alpha ' peak is probably a field-induced local orientation of chain segments made possible by the increase in free volume consecutive to the drawing process. During this polarization step, which involves a thermal treatment of the drawn material up to 100 degrees C, a progressive change in structure and dipolar environment occurs, and this tends to shift and broaden the relaxation as seen in subsequent TSDC cycles.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130756628","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}
引用次数: 0
Bulk and interfacial dielectric response of dysprosium and ytterbium oxide thin capacitors 氧化镝和氧化镱薄电容器的体积和界面介电响应
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38639
T. Wiktorczyk
{"title":"Bulk and interfacial dielectric response of dysprosium and ytterbium oxide thin capacitors","authors":"T. Wiktorczyk","doi":"10.1109/ISE.1988.38639","DOIUrl":"https://doi.org/10.1109/ISE.1988.38639","url":null,"abstract":"Capacitance, dielectric permittivity and losses are presented as a function of temperature, frequency, DC voltage, insulator thickness, and electrode material for Dy/sub 2/O/sub 3/ and Yb/sub 2/O/sub 3/ thin films deposited in MIM (metal-insulator-metal) sandwiches. Results show that both volumes of the dielectric films as well as the M/I interfaces (Schottky barriers) are responsible for the dielectric response of these capacitors.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125990945","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}
引用次数: 1
Mechanism of charge formation in the irradiated polyethylene 辐照聚乙烯中电荷形成机理的研究
6th International Symposium on Electrets,(ISE 6) Proceedings. Pub Date : 1988-09-01 DOI: 10.1109/ISE.1988.38619
V. Gromov, A. G. Rozno, O.V. Procopiev
{"title":"Mechanism of charge formation in the irradiated polyethylene","authors":"V. Gromov, A. G. Rozno, O.V. Procopiev","doi":"10.1109/ISE.1988.38619","DOIUrl":"https://doi.org/10.1109/ISE.1988.38619","url":null,"abstract":"Summary form only given, as follows. Using the acoustic wave method, the electric charge distribution in polyethylene was studied. A correlation was established between the charge accumulation and a portion of the crosslinking of the irradiated polyethylene. A mechanism of electric charge accumulation in connection with the molecular structure of polyethylene and different polymers is discussed.<<ETX>>","PeriodicalId":199976,"journal":{"name":"6th International Symposium on Electrets,(ISE 6) Proceedings.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125616733","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}
引用次数: 0
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