2005 12th International Symposium on Electrets最新文献

Ferroelectric relaxor terpolymers: properties and potential applications 铁电弛豫聚合物:性能和潜在应用

2005 12th International Symposium on Electrets Pub Date : 2006-07-01 DOI: 10.1109/ISAF.2006.4387847

F. Bauer, E. Fousson, Q.M. Zhang

{"title":"Ferroelectric relaxor terpolymers: properties and potential applications","authors":"F. Bauer, E. Fousson, Q.M. Zhang","doi":"10.1109/ISAF.2006.4387847","DOIUrl":"https://doi.org/10.1109/ISAF.2006.4387847","url":null,"abstract":"Ferroelectric materials are intrinsically multifunctional and have found a broad range of applications. A new class of semicrystalline terpolymers comprising vinylidene fluoride (VDF), trifluoroethylene (TrFE), and 1,1-chlorofluoroethylene (CFE), were prepared at ISL via a suspension polymerization process. A cooperative research program between our laboratories has led to extensive characterization and understanding of many compositions of these new relaxor terpolymers. Relevant studies and results show that this class of electroactive polymers offers unique properties in comparison with other ferroelectric polymers. The terpolymer exhibits high electrostrictive strain (>7%) with relatively high modulus (>0.3GPa). It has been also observed that the large electrostrictive strain is nearly constant in the temperature range from 20 /spl deg/C to 80 /spl deg/C. The high room temperature relative dielectric constant (/spl sim/50, which is the highest among all the known polymers), high induced polarization (/spl sim/ 0.05 C/m/sup 2/), and high electric breakdown field (>400 MV/m) lead to very high volume efficiency for the electric energy storage operated under high voltage (/spl sim/10 J/cm/sup 3/). It should be pointed out that large entropy change associated with the polarization change in the material has been observed.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"399 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133123446","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

Influence of the processing conditions and corona poling on the morphology of /spl beta/-PVDF 加工条件和电晕极化对/spl β /-PVDF形貌的影响

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612345

V. Sencadas, S. Lanceros‐Méndez, Rinaldo Gregório Filho, D. L. Chinaglia, A. S. Pouzada

引用次数: 8

Electrical behavior of PU/POMA blends 聚氨酯/聚甲醛共混物的电性能

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612383

D. Kanda, J. A. Malmonge, W. F. Alves, L. F. Malmonge

引用次数: 0

Electrooptic Proprieties of Layer-By-Layer Films of a Azobenzene Containing Copolymer 含偶氮苯共聚物层膜的电光特性

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612443

P. A. Ribeiro, P. J. Gomes, Q. Ferreira, M. Raposo, D. S. D. dos Santos, D. Balogh, O. N. Oliveira, J. Giacometti

引用次数: 0

Photo-oxidation of polyphenylenevinylene chains in Langmuir-Blodgett and cast films Langmuir-Blodgett和铸膜中聚苯乙烯链的光氧化

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612327

Marystela Ferreira, C. A. Olivati, D. Balogh, Roberto M. Faria, Osvaldo N. Oliveira

{"title":"Photo-oxidation of polyphenylenevinylene chains in Langmuir-Blodgett and cast films","authors":"Marystela Ferreira, C. A. Olivati, D. Balogh, Roberto M. Faria, Osvaldo N. Oliveira","doi":"10.1109/ISE.2005.1612327","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612327","url":null,"abstract":"Poly(p-phenylene vinylene) (PPV) derivatives are well known for their applications in polymer light emitting diodes (PLEDs). These derivatives are highly susceptible to photooxidation though, which is mainly caused by the scission of the vinyl double bond on the polymer backbone. In this work, we show that Langmuir-Blodgett (LB) films are less degraded than cast films of a PPV derivative (OC/sub 1/OC/sub 6/-PPV). Both films had similar thickness (/spl sim/50 nm) to allow for a more realistic comparison. Photodegradation experiments were carried out by illuminating the films with white light from a halogen lamp (50W, 12V), placed at a fixed distance from the sample. The decay was monitored by UV-Vis and FTIR spectroscopies. The results showed that cast films are completely degraded in ca. 300 min, while LB took longer times, ca. 1000 min, i.e. 3 times the values for the cast films. The degradation process occurs in at least two stages, the rates of which were calculated assuming that the reaction follows a first order kinetics. The characteristic times for the first stage were 3.6/spl times/10/sup -2/and 1.3/spl times/10/sup -3/ min/sup -1/ for cast and LB films, respectively. For the second stage the characteristic times were 5.6/spl times/10/sup -2/ and 5.0/spl times/10/sup -3/min/sup -1/ . The differences can be attributed to the more compact morphology in the LB than in the cast films. With a compact morphology the diffusion of oxygen in the LB film is hampered and this causes a delay in the degradation process.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134424685","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

PHB/PZT composite PHB /压电复合

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612348

J. A. Malmonge, L.H. Okajima, L. F. Malmonge, W. Sakamoto, S. M. Malmonge

引用次数: 0

Dielectric behavior of XLPE aged under multi-stressing conditions 多应力老化下交联聚乙烯的介电性能

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612369

E. L. Leguenza, R. Robert, W. A. Moura, J. Giacometti

引用次数: 7

Study of the thermomechanical and electrical properties of conducting composites containing natural rubber and carbon black 含天然橡胶和炭黑导电复合材料的热、机械和电学性能研究

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612394

F. Oliveira, N. Alves, J. Giacometti, C. Constantino, L. Mattoso, A.M.O.A. Balan, A. Job

引用次数: 37

The Investigation of /spl alpha//spl rArr//spl beta/ phase transition in poly(vinylidene fluoride) (PVDF) 聚偏氟乙烯(PVDF)中/spl α //spl rr//spl β /相变的研究

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612350

C. Constantino, A. Job, R. D. Simões, J. Giacometti, V. Zucolotto, O. N. Oliveira, G. Gozzi, D. L. Chinaglia

引用次数: 3

Calcium modified lead titanate/poly-ether-ether-ketone composite for acoustic emission sensors 声发射传感器用钙改性钛酸铅/聚醚醚酮复合材料

2005 12th International Symposium on Electrets Pub Date : 2005-12-01 DOI: 10.1109/ISE.2005.1612408

W. Sakamoto, R. Higuti, A.F.G. da Silva, J. A. Malmonge, L. F. Malmonge

引用次数: 1