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10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)最新文献

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Thermal treatment effects on phase transitions in P(VDF-TrFE) 热处理对P(VDF-TrFE)相变的影响
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-12-01 DOI: 10.1109/ISE.1999.832058
N. Alves, Pura Ruiz, A. Job, O. N. Oliveira, J. Giacometti
{"title":"Thermal treatment effects on phase transitions in P(VDF-TrFE)","authors":"N. Alves, Pura Ruiz, A. Job, O. N. Oliveira, J. Giacometti","doi":"10.1109/ISE.1999.832058","DOIUrl":"https://doi.org/10.1109/ISE.1999.832058","url":null,"abstract":"The authors present DSC studies where heating and cooling rates and also thermal treatments were varied systematically. The results for 60/40 P(VDFTrFE) are presented in this paper which confirm the importance of thermal history and also show that samples with various configurations in terms of ferroelectric phases can be obtained in a somewhat controlled way via thermal treatment.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125626889","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
Electromechanical response of cellular electret films 细胞驻极体薄膜的机电响应
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-11-16 DOI: 10.1109/ISE.1999.832037
G. Sessler, J. Hillenbrand
{"title":"Electromechanical response of cellular electret films","authors":"G. Sessler, J. Hillenbrand","doi":"10.1109/ISE.1999.832037","DOIUrl":"https://doi.org/10.1109/ISE.1999.832037","url":null,"abstract":"Charged films with a cellular structure show pseudo-piezoelectric properties with high transducer constants. The electromechanical response equations of such films are derived for their operation as sensors and actuators. Measurements of the direct and inverse transducer constants, the thermal stability of the charge, and Young's modulus are presented. By assuming reasonable charge distributions and charge densities, the calculated transducer constants are in good agreement with the measured values. Both the theoretical model and the measurements show the reciprocity of the transducer constants.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132718749","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: 309
Molecular mobility and hydration properties in polyurethane and styrene-acrylonitrile blends 聚氨酯和苯乙烯-丙烯腈共混物的分子迁移率和水化性能
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.832090
A. Kanapitsas, P. Pissis
{"title":"Molecular mobility and hydration properties in polyurethane and styrene-acrylonitrile blends","authors":"A. Kanapitsas, P. Pissis","doi":"10.1109/ISE.1999.832090","DOIUrl":"https://doi.org/10.1109/ISE.1999.832090","url":null,"abstract":"Dielectric measurements by means of thermally stimulated depolarization currents (TSDC) techniques in the temperature range 90-300 K were used to study molecular mobility and morphology in blends of polyurethanes based on branched polymer polyol (PUR) and styrene-acrylonitrile copolymer (SAN) with different SAN content. Water sorption/desorption isotherms both in equilibrium (ESI) and dynamic (DSI) were used to measure isothermal water uptake and diffusion coefficients. Water sorption has a significant influence on the /spl gamma/ and /spl beta/ relaxations. With increasing water content the MWS peak shifts to lower temperatures. For all samples studied the amount of water at saturation was found to decrease with increasing temperature and SAN content in the blends.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115165307","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
PZT/P(VDF-TrFE) nanocomposites for ultrasonic hydrophone application 超声水听器用PZT/P(VDF-TrFE)纳米复合材料
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.832154
S. T. Lau, Q.F. Zhou, K. Kwok, H. Chan, C. Choy
{"title":"PZT/P(VDF-TrFE) nanocomposites for ultrasonic hydrophone application","authors":"S. T. Lau, Q.F. Zhou, K. Kwok, H. Chan, C. Choy","doi":"10.1109/ISE.1999.832154","DOIUrl":"https://doi.org/10.1109/ISE.1999.832154","url":null,"abstract":"0-3 composites with nanosized lead zirconate titanate (PZT) powder imbedded in a vinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE)) matrix have been fabricated. Since the piezoelectric coefficients of PZT and P(VDF-TrFE) have opposite signs, the PZT and P(VDF-TrFE) phases in the nanocomposites were poled in opposite directions in order to enhance the piezoelectric activity. The PZT powder, prepared by a sol-gel process, has a tetragonal structure. The ratio of the [002] and [200] X-ray diffraction peaks was used as a measure of the degree of poling in the ceramic phase. The piezoelectric coefficient of the nanocomposite film was measured by a laser interferometry technique. A needle type hydrophone for the calibration of medical ultrasonic transducers was fabricated using the nanocomposite as the sensing element and its performance was evaluated.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115274877","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
Dielectric and electret properties of novel Teflon PTFE and PTFE-like polymers 新型聚四氟乙烯聚四氟乙烯和类聚四氟乙烯聚合物的介电和驻极体特性
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.832050
R. Schwodiauer, G. Neugschwandtner, S. Bauer-Gogonea, S. Bauer, J. Heitz, D. Bauerle
{"title":"Dielectric and electret properties of novel Teflon PTFE and PTFE-like polymers","authors":"R. Schwodiauer, G. Neugschwandtner, S. Bauer-Gogonea, S. Bauer, J. Heitz, D. Bauerle","doi":"10.1109/ISE.1999.832050","DOIUrl":"https://doi.org/10.1109/ISE.1999.832050","url":null,"abstract":"Dielectric, elastic and electret properties were investigated on pulsed-laser deposited (PLD) polytetrafluoroethylene (PTFE) on silicon substrates, on microporous PTFE foils and on hybrid electrets consisting of microporous PTFE and perfluorocyclobutene (PFCB). Dielectric dilatometry was used to detect glass- and structural phase-transitions in these nonpolar polymers: PLD-PTFE and microporous PTFE foils show the characteristic first-order phase transitions of PTFE. The fibrillar structure of the microporous PTFE results in large electrostrictive coefficients. Both the PTFE-like materials and the hybrid PTFE-PFCB electrets show excellent charge-storage stability and surpass conventional PTFE in performance. Applications can be anticipated in miniaturized electret devices as well as sensitive electret hydrophones.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121371122","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: 15
Dielectric properties of ethyl cellulose and ethyl-cellulose acrylic acid system 乙基纤维素和乙基纤维素丙烯酸体系的介电性能
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.832057
S. Jain, P. Khare
{"title":"Dielectric properties of ethyl cellulose and ethyl-cellulose acrylic acid system","authors":"S. Jain, P. Khare","doi":"10.1109/ISE.1999.832057","DOIUrl":"https://doi.org/10.1109/ISE.1999.832057","url":null,"abstract":"Dielectric permittivities and losses were measured above room temperature in the frequency range 10/sup 2/-10/sup 6/ Hz for undoped and acrylic acid (AA) doped ethyl cellulose (EC) films (thickness about 20 microns) with progressively increasing AA concentration. The variation of permittivity with temperature is attributed to thermal expansion in the lower temperature region to the orientation of dipolar molecules in the neighbourhood of Tg and random thermal motion of molecules above Tg. The dielectric losses exhibit one peak. Doping with acrylic acid is found to affect the magnitude and position of the loss peak. An explanation for this has been attempted on the basis of charge transfer complex formation.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"1160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127262345","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
Theoretical and experimental analysis of electron beam irradiated polymers 电子束辐照聚合物的理论与实验分析
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.831959
D. L. Chinaglia, M. Figueiredo, L. F. Santos, G. F. Leal Ferreira, R. Faria
{"title":"Theoretical and experimental analysis of electron beam irradiated polymers","authors":"D. L. Chinaglia, M. Figueiredo, L. F. Santos, G. F. Leal Ferreira, R. Faria","doi":"10.1109/ISE.1999.831959","DOIUrl":"https://doi.org/10.1109/ISE.1999.831959","url":null,"abstract":"Charge transport and storage phenomena were analyzed in Teflon FEP, polyethylene (PE), and poly(vinylidene fluoride) (PVDF) foils irradiated with partially penetrating electron beams, in a Split Faraday Cup (SFC) arrangement. Measurements of electrical current were performed during the electron irradiation. The irradiated front electrode was grounded while the rear electrode was positively biased. The experimental results were fitted by models which considered two different media: the irradiated region (I) and the non-irradiated one (NI). In the later, NI-region, the intrinsic electrical properties of the material were considered. In the I-region, on the other hand, effects of irradiation, as carrier generation, recombination effect and trapping-detrapping phenomenon play a fundamental role in the transport process. Beside the explanation of the experimental behavior observed in each material, the theoretical treatment provided important electrical parameters.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123742658","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
TSDC as a tool to monitor the electret state induced by water in biomolecules TSDC作为一种监测水在生物分子中诱导的驻极体状态的工具
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.831969
R. Capelletti, M. G. Bridelli
{"title":"TSDC as a tool to monitor the electret state induced by water in biomolecules","authors":"R. Capelletti, M. G. Bridelli","doi":"10.1109/ISE.1999.831969","DOIUrl":"https://doi.org/10.1109/ISE.1999.831969","url":null,"abstract":"TSDC (thermally stimulated depolarisation currents) technique, applied to a variety of natural and synthetic biopolymers has provided a valuable contribution to the understanding of the complex behaviour of the structured water, thanks to its high sensitivity and selectivity. Mechanisms such as noninteracting dipole reorientation, Maxwell-Wagner relaxation, protonic percolation, are envisaged as responsible for the peaks associated with water in a variety of configurations. The plastifying role played by water in macromolecular phase transitions, induced by the water network rearrangement, have been monitored through the careful analysis of the TSDC spectra. In the present paper the results obtained by different authors are reviewed.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125271176","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: 4
Dielectric spectroscopy analysis of electrically aged low density polyethylene 电老化低密度聚乙烯的介电光谱分析
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.832095
M. Lança, M. T. Viciosa, C.J. Diasl, J. Marat Mendes, M. Bento, D. D. Das Gupta
{"title":"Dielectric spectroscopy analysis of electrically aged low density polyethylene","authors":"M. Lança, M. T. Viciosa, C.J. Diasl, J. Marat Mendes, M. Bento, D. D. Das Gupta","doi":"10.1109/ISE.1999.832095","DOIUrl":"https://doi.org/10.1109/ISE.1999.832095","url":null,"abstract":"The analysis of the low frequency dielectric loss of electrically aged LDPE shows an increase with electrical ageing. This could be further verified by extending the frequency range down to 10-5 Hz in order to measure the changes at the expected peak maximum. TSDC results are however inconclusive whether the measured current is due to dipoles or space charge. The observed difference between charge release from the two samples surfaces indicates that there is an asymmetrical distribution of space charge or polarization. This agrees with the optical microscope observations showing that one of the sides has a greater water tree density than the other. A difference on the initial TSDC current level (near 20/spl deg/C) appears to be more dependent on the short-circuit time than on the poling time. If a TSDC is performed without poling the measured current is near zero, revealing that space charges have been removed or that the dipoles have been disoriented.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125552603","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
Composite films based on polyurethane ionomer polypyrrole and their properties 聚氨酯离聚体聚吡咯复合薄膜及其性能
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) Pub Date : 1999-09-22 DOI: 10.1109/ISE.1999.832092
I. Diaconu, P. Coman, T. Buruiană, E. Buruianǎ
{"title":"Composite films based on polyurethane ionomer polypyrrole and their properties","authors":"I. Diaconu, P. Coman, T. Buruiană, E. Buruianǎ","doi":"10.1109/ISE.1999.832092","DOIUrl":"https://doi.org/10.1109/ISE.1999.832092","url":null,"abstract":"Properties of series of polyurethane/polypyrrole composite films were investigated by d.c. conductivity, dielectric spectroscopy and tensile strength techniques. A dependence of the physical properties of the composite films on the polyurethane structure, the nature of the oxidizing agent and the polypyrrole content was observed comparatively with the untreated polyurethane cationomer films. Insertion of polypyrrole increases the d.c. conductivity with about six magnitude orders. Dielectric relaxation spectra are slightly affected by the oxidizing agent but more influenced by the polypyrrole content. Tensile strength characteristics such as tensile stress and elongation at break decrease by incorporation of the polypyrrole. These effects were attributed to enhanced phase mixing by electrostatic interactions of the polyurethane cationomer with oxidizing agents and polypyrrole.","PeriodicalId":257431,"journal":{"name":"10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115559253","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
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