Pub Date : 2013-10-08DOI: 10.1109/ICSD.2013.6619732
T. Heid, S. Savoie, C. Vanga, M. Frechette, É. David, N. Freebody, A. Vaughan
Boron nitride (BN) has shown in the past to improve DC breakdown strength as well as augmenting thermal conductivity. Two different filler sizes, one micrometric with an average particle size of 9 μm and a sub-micrometric one, 0.5 μm in size, have been used to form composites. The amount of each type of BN in the matrix has been varied from 1 to 5 wt%. The samples have been exposed to electrical discharges using a point-to-plane geometry operated in open air. The experiment was conducted at an enhanced frequency of 300 Hz to accelerate the erosion process. The surface erosion has been evaluated after several distinct time steps using a mechanical profilometer. It has been found that introducing BN into epoxy decreases the amount of eroded volume of the organic matrix with decreasing filler amount. In addition, micrometric BN composites performed better than their sub-micrometric counterparts. The dielectric response has been evaluated using broadband dielectric spectroscopy (BDS) at 20°C before the erosion, as well as after each time step. An increase of dielectric losses at very low frequencies for all samples after erosion has been observed, accompanied by a slight increase in real permittivity. Besides the β-peak, the formation of an additional loss peak, located around 1 Hz, has been found.
{"title":"Surface resistance of epoxy/BN micro- and Meso-composites exposed to electrical discharges","authors":"T. Heid, S. Savoie, C. Vanga, M. Frechette, É. David, N. Freebody, A. Vaughan","doi":"10.1109/ICSD.2013.6619732","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619732","url":null,"abstract":"Boron nitride (BN) has shown in the past to improve DC breakdown strength as well as augmenting thermal conductivity. Two different filler sizes, one micrometric with an average particle size of 9 μm and a sub-micrometric one, 0.5 μm in size, have been used to form composites. The amount of each type of BN in the matrix has been varied from 1 to 5 wt%. The samples have been exposed to electrical discharges using a point-to-plane geometry operated in open air. The experiment was conducted at an enhanced frequency of 300 Hz to accelerate the erosion process. The surface erosion has been evaluated after several distinct time steps using a mechanical profilometer. It has been found that introducing BN into epoxy decreases the amount of eroded volume of the organic matrix with decreasing filler amount. In addition, micrometric BN composites performed better than their sub-micrometric counterparts. The dielectric response has been evaluated using broadband dielectric spectroscopy (BDS) at 20°C before the erosion, as well as after each time step. An increase of dielectric losses at very low frequencies for all samples after erosion has been observed, accompanied by a slight increase in real permittivity. Besides the β-peak, the formation of an additional loss peak, located around 1 Hz, has been found.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132494074","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619896
Y. Zhang, M. Danikas, Xu Zhao, Yonghong Cheng
In this paper, some results are presented on experiments concerning partial discharge (PD) behaviour of epoxy resin samples having 3 wt% nano- and 3 wt% micro-fillers, as well as epoxy samples having 3 wt% and 1 wt% nanoparticles. The nano- and micro-fillers were TiO2 (titania). The electrode arrangement used was a plane/plane arrangement. Some preliminary results with this plane/plane electrode arrangement on nanocomposite polymers were reported as well as quantities of comparing analysis with other's research achievements. The main intention in this paper is to see whether a sample with PD at its inception voltage, still presents some tendency to charging effects below inception and try to discuss the possible content of the charging effects. This paper also analyzes the reasons of different PD behaviour between conventional polymers and nanomaterials from their structure and the existence of fillers.
{"title":"Nanocomposite polymers: Possible charging effects below inception voltage","authors":"Y. Zhang, M. Danikas, Xu Zhao, Yonghong Cheng","doi":"10.1109/ICSD.2013.6619896","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619896","url":null,"abstract":"In this paper, some results are presented on experiments concerning partial discharge (PD) behaviour of epoxy resin samples having 3 wt% nano- and 3 wt% micro-fillers, as well as epoxy samples having 3 wt% and 1 wt% nanoparticles. The nano- and micro-fillers were TiO2 (titania). The electrode arrangement used was a plane/plane arrangement. Some preliminary results with this plane/plane electrode arrangement on nanocomposite polymers were reported as well as quantities of comparing analysis with other's research achievements. The main intention in this paper is to see whether a sample with PD at its inception voltage, still presents some tendency to charging effects below inception and try to discuss the possible content of the charging effects. This paper also analyzes the reasons of different PD behaviour between conventional polymers and nanomaterials from their structure and the existence of fillers.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130880069","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619757
Yu Chen, Jiang Wu, M. Cho, K. Toyoda
In this paper, a pulsed scanning method for the total electron emission yield measurement of insulating materials is proposed. A total electron detector with big hollow space and insulating spacer, and a pulsed yield scanning measurement system is recommended. This method can avoid influence from the charged surface of the insulating material. Using the system, the total secondary electron emission yields of several typical polymers, such as, PA, PS, PI, PTFE, HDPE, PC, PMMA, PEEK, PET, UHMW-PE, have been reported, as induced by a 30 microsecond pulse of primary electrons with ~ 20 nA incident beam current and energies up to 2500 eV.
{"title":"Total electron emission yields of typical polymers","authors":"Yu Chen, Jiang Wu, M. Cho, K. Toyoda","doi":"10.1109/ICSD.2013.6619757","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619757","url":null,"abstract":"In this paper, a pulsed scanning method for the total electron emission yield measurement of insulating materials is proposed. A total electron detector with big hollow space and insulating spacer, and a pulsed yield scanning measurement system is recommended. This method can avoid influence from the charged surface of the insulating material. Using the system, the total secondary electron emission yields of several typical polymers, such as, PA, PS, PI, PTFE, HDPE, PC, PMMA, PEEK, PET, UHMW-PE, have been reported, as induced by a 30 microsecond pulse of primary electrons with ~ 20 nA incident beam current and energies up to 2500 eV.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131014428","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619713
Jintao Liao, Zongren Peng, Shiling Zhang
The use of a grading ring is important to improve the E-Field conditions of composite insulators. With FEM, this paper used a static three dimensional model to calculate the potential and E-Field distribution of composite insulator on a cup-tower for 750 kV AC transmission lines. The influence of the configuration and parameters of the grading rings had been analyzed. The configuration of a large and a small grading ring at the conductor side and a medium grading ring at the tower side proved to be reasonable and the insulators in middle phase experienced higher E-Field intensity than that in side phase. The E-Field intensity of insulators and grading rings had been calculated by changing the dimensions and location of the large grading ring and finally appropriate parameters of the large grading ring were recommended. The results of checking calculation had verified that the optimized grading configuration can not only improve the E-Field conditions of the insulator, but also reduce the E-Field intensity of grading rings and end-fittings.
{"title":"Electric-field calculation and grading ring design for 750 kV AC composite insulator","authors":"Jintao Liao, Zongren Peng, Shiling Zhang","doi":"10.1109/ICSD.2013.6619713","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619713","url":null,"abstract":"The use of a grading ring is important to improve the E-Field conditions of composite insulators. With FEM, this paper used a static three dimensional model to calculate the potential and E-Field distribution of composite insulator on a cup-tower for 750 kV AC transmission lines. The influence of the configuration and parameters of the grading rings had been analyzed. The configuration of a large and a small grading ring at the conductor side and a medium grading ring at the tower side proved to be reasonable and the insulators in middle phase experienced higher E-Field intensity than that in side phase. The E-Field intensity of insulators and grading rings had been calculated by changing the dimensions and location of the large grading ring and finally appropriate parameters of the large grading ring were recommended. The results of checking calculation had verified that the optimized grading configuration can not only improve the E-Field conditions of the insulator, but also reduce the E-Field intensity of grading rings and end-fittings.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123301803","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619769
M. Niittymaki, K. Lahti, T. Suhonen, U. Kanerva, Jarkko Metsajoki
Thermally sprayed ceramic coatings can be used as electrical insulators for example in high temperature applications (e.g. fuel cells) or in other demanding conditions. In electrical insulation applications the mostly used coating materials are aluminum oxide, magnesium oxide and magnesium aluminate. In general, only few reports of dielectric properties of thermally sprayed ceramic coatings can be found in literature and further analysis is thus needed. In addition, the measurement methods and conditions in previous research are often not fully documented, complicating the evaluation and comparison of the properties of different coatings. The aim of this paper was to characterize dielectric properties of thermally sprayed ceramic spinel coating sprayed with high-velocity oxygen fuel (HVOF) technique. The studied dielectric properties are DC resistivity, DC dielectric breakdown strength, as well as permittivity and dielectric losses at different frequencies. All measurements were made at temperature of 20 °C and at relative humidity of 20 %. Dielectric properties and the composition of coating material are presented and analyzed.
{"title":"Dielectric properties of HVOF sprayed ceramic coatings","authors":"M. Niittymaki, K. Lahti, T. Suhonen, U. Kanerva, Jarkko Metsajoki","doi":"10.1109/ICSD.2013.6619769","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619769","url":null,"abstract":"Thermally sprayed ceramic coatings can be used as electrical insulators for example in high temperature applications (e.g. fuel cells) or in other demanding conditions. In electrical insulation applications the mostly used coating materials are aluminum oxide, magnesium oxide and magnesium aluminate. In general, only few reports of dielectric properties of thermally sprayed ceramic coatings can be found in literature and further analysis is thus needed. In addition, the measurement methods and conditions in previous research are often not fully documented, complicating the evaluation and comparison of the properties of different coatings. The aim of this paper was to characterize dielectric properties of thermally sprayed ceramic spinel coating sprayed with high-velocity oxygen fuel (HVOF) technique. The studied dielectric properties are DC resistivity, DC dielectric breakdown strength, as well as permittivity and dielectric losses at different frequencies. All measurements were made at temperature of 20 °C and at relative humidity of 20 %. Dielectric properties and the composition of coating material are presented and analyzed.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122961439","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619692
G. Testin, P. Cardano, M. Šehovac, M. Boutlendj, L. Perego, A. Pastore, A. Pigini, P. J. Howard, F. Perrot
Finite Element Analysis (FEA) has evolved over the years from a purely academic pursuit into everyday product development due to the evolution of the computation power and software developments. Engineering simulation technology allows now the detailed analyses of complex sub-systems in different configurations, combined with physical conditions that equipment faces in the real word. It is shown how FEA is nowadays an essential tool for the optimization of the design from the electrical, mechanical and thermal point of view, with special reference to UHV and HVDC bushings.
{"title":"Digital modelling: An essential tool for UHV and HVDC bushings design","authors":"G. Testin, P. Cardano, M. Šehovac, M. Boutlendj, L. Perego, A. Pastore, A. Pigini, P. J. Howard, F. Perrot","doi":"10.1109/ICSD.2013.6619692","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619692","url":null,"abstract":"Finite Element Analysis (FEA) has evolved over the years from a purely academic pursuit into everyday product development due to the evolution of the computation power and software developments. Engineering simulation technology allows now the detailed analyses of complex sub-systems in different configurations, combined with physical conditions that equipment faces in the real word. It is shown how FEA is nowadays an essential tool for the optimization of the design from the electrical, mechanical and thermal point of view, with special reference to UHV and HVDC bushings.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126593461","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619725
Chao Wu, Xingyi Huang, Fei Liu, Xinfeng Wu, P. Jiang
Graphene, a two-dimensional monolayer of carbon atoms with conjugated honeycomb structure, has received broad interest owing to its unique physical properties such as high electrical conductivity, excellent mechanical strength, and large surface area. One promising route to harnessing these properties for applications is to improve dielectric properties of polymer by adding graphene sheets at low loading. However, graphene sheets are prone to aggregate, resulting that the improvement of dielectric properties of graphene-based composites is significantly compromised or even unavailable. In this study, we have investigated the effect of functional of graphene sheet on the dielectric properties of the compoistes. The functionalized graphene-based polymer composites show higher dielectric constant and low dielectric loss when compared with graphene composites.
{"title":"Functional graphene for high dielectric performance polymer composites","authors":"Chao Wu, Xingyi Huang, Fei Liu, Xinfeng Wu, P. Jiang","doi":"10.1109/ICSD.2013.6619725","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619725","url":null,"abstract":"Graphene, a two-dimensional monolayer of carbon atoms with conjugated honeycomb structure, has received broad interest owing to its unique physical properties such as high electrical conductivity, excellent mechanical strength, and large surface area. One promising route to harnessing these properties for applications is to improve dielectric properties of polymer by adding graphene sheets at low loading. However, graphene sheets are prone to aggregate, resulting that the improvement of dielectric properties of graphene-based composites is significantly compromised or even unavailable. In this study, we have investigated the effect of functional of graphene sheet on the dielectric properties of the compoistes. The functionalized graphene-based polymer composites show higher dielectric constant and low dielectric loss when compared with graphene composites.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116193930","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619716
C. Pham, L. Wei, M. Locatelli, S. Diaham
High temperature dielectric relaxation spectroscopy (DRS) experiments have been performed on MIS (metal-insulator-semiconductor), MOS (metal-oxide-semiconductor) single-layer and MIOS (metal-insulator-oxide-semiconductor) double-layer structures, where I is polyimide (PI) film (10μm), and O is PECVD SiO2 thin film (1.5 μm-thick), from 200 to 350 °C, in the 10-1 Hz to 106 Hz frequency range. In such a high temperature range and/or at low frequencies, the dielectric spectra are often influenced by interfacial dielectric relaxations such as Maxwell-Wagner-Sillars (MWS) and electrode polarization (EP). The empirical Havriliak-Negami (H-N) model is used to determine the σdc values from the effective ac dielectric response. For single-(PI) and double-layer structures (PI/SiO2), the σdc varies from 1.1×10-10 to 5.5×10-9 Ω-1 cm-1 and from 7×10-14 to 2.3×10-12 Ω-1 1cm-1 between 250 and 350°C, with an activation energy of the conduction phenomenon of 1.1 and 0.95 eV, respectively. The PI/SiO2 structure is suited for semiconductor device passivation applications at high temperature up to 300°C.
{"title":"Dielectric relaxation spectroscopy of single- and double-layer polyimide/SiO2 thin films","authors":"C. Pham, L. Wei, M. Locatelli, S. Diaham","doi":"10.1109/ICSD.2013.6619716","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619716","url":null,"abstract":"High temperature dielectric relaxation spectroscopy (DRS) experiments have been performed on MIS (metal-insulator-semiconductor), MOS (metal-oxide-semiconductor) single-layer and MIOS (metal-insulator-oxide-semiconductor) double-layer structures, where I is polyimide (PI) film (10μm), and O is PECVD SiO<sub>2</sub> thin film (1.5 μm-thick), from 200 to 350 °C, in the 10<sup>-1</sup> Hz to 10<sup>6</sup> Hz frequency range. In such a high temperature range and/or at low frequencies, the dielectric spectra are often influenced by interfacial dielectric relaxations such as Maxwell-Wagner-Sillars (MWS) and electrode polarization (EP). The empirical Havriliak-Negami (H-N) model is used to determine the σ<sub>dc</sub> values from the effective ac dielectric response. For single-(PI) and double-layer structures (PI/SiO<sub>2</sub>), the σ<sub>dc</sub> varies from 1.1×10<sup>-10</sup> to 5.5×10<sup>-9</sup> Ω<sup>-1</sup> cm<sup>-1</sup> and from 7×10<sup>-14</sup> to 2.3×10<sup>-12</sup> Ω<sup>-1</sup> 1cm<sup>-1</sup> between 250 and 350°C, with an activation energy of the conduction phenomenon of 1.1 and 0.95 eV, respectively. The PI/SiO<sub>2</sub> structure is suited for semiconductor device passivation applications at high temperature up to 300°C.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"151 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120940880","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}
The structure of double circuit transposition tower in 1000 kV ultra-high voltage (UHV) AC transmission lines is complex and it has various types of jumper. The electric field distribution on the surface of jumper is higher and more uneven when compared to ordinary tension tower. With three dimensional finite element method (FEM) and harmonic analysis, the electric field distribution on the surface of jumper was calculated when considering the effect of tower, fittings, insulator strings and phase influence, the regularity of electric field distribution on jumper were researched and the jumper that didn't meet the electric field standard was optimized. The achievements obtained in this paper will be used in UHV project and relieve the problem of audible noise and radio and television interference.
{"title":"Electric field distribution calculation and analysis on the surface of jumper on double circuit transposition tower in UHV AC transmission lines","authors":"Xi Yang, Zongren Peng, Naiyi Li, Haohui Cai, Shiling Zhang, Jintao Liao","doi":"10.1109/ICSD.2013.6619912","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619912","url":null,"abstract":"The structure of double circuit transposition tower in 1000 kV ultra-high voltage (UHV) AC transmission lines is complex and it has various types of jumper. The electric field distribution on the surface of jumper is higher and more uneven when compared to ordinary tension tower. With three dimensional finite element method (FEM) and harmonic analysis, the electric field distribution on the surface of jumper was calculated when considering the effect of tower, fittings, insulator strings and phase influence, the regularity of electric field distribution on jumper were researched and the jumper that didn't meet the electric field standard was optimized. The achievements obtained in this paper will be used in UHV project and relieve the problem of audible noise and radio and television interference.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125609524","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619776
J. Zha, F. Sun, Z. Dang
Polyimides (PIs) are a class of representative high-performance engineering plastics possessing the cyclic imide and aromatic groups. Aromatic polyimides have been extensively investigated due to their excellent thermal stability, mechanical properties, along with their good chemical resistance and dielectric properties. Carbon nanotubes (CNTs) have been widely used in many fields such as electrodes, nanometer electron device, and composites etc, as CNTs are considered as the ideal reinforcing nanofillers owing to low density, high aspect ratio, high stiffness, and extremely high strength. With the development of the electrospinning technology, PI nanocomposites containing CNTs have received more significant attention. However, only a few studies have described the conductive mechanism and mechanical properties of PI/CNTs nanocomposites by electrospinning. In this paper, in order to improve the interfacial interaction and compatibility between the MWNTs and the matrix, pristine MWNTs were firstly treated with concentrated HNO3 to obtain the acid-functionalized MWNTs, and then the electrospinning solutions are prepared via in-situ polymerization. At last, PI nanofibers and the nanofiber composites with MWNTs were fabricated by electrospinning. The controllable structure such as parallel fiber is formed. The dispersion and alignment morphologies of MWNTs in the electrospun nanofibers, as well as the thermal and mechanical properties of the nanofiber composites, were studied in detail. The relationship between structure and electrical properties of the nanofiber composites are also studied. To sum up, such a homogeneity approach to fabricate high-performance PI/CNTs nanofiber films is a good attempt toward utilizing CNTs in polymer matrices to achieve excellent thermal, electrical, and mechanical properties in practical use.
{"title":"Fabrication and properties of high performance polyimide nanofibrous films by electrospinning","authors":"J. Zha, F. Sun, Z. Dang","doi":"10.1109/ICSD.2013.6619776","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619776","url":null,"abstract":"Polyimides (PIs) are a class of representative high-performance engineering plastics possessing the cyclic imide and aromatic groups. Aromatic polyimides have been extensively investigated due to their excellent thermal stability, mechanical properties, along with their good chemical resistance and dielectric properties. Carbon nanotubes (CNTs) have been widely used in many fields such as electrodes, nanometer electron device, and composites etc, as CNTs are considered as the ideal reinforcing nanofillers owing to low density, high aspect ratio, high stiffness, and extremely high strength. With the development of the electrospinning technology, PI nanocomposites containing CNTs have received more significant attention. However, only a few studies have described the conductive mechanism and mechanical properties of PI/CNTs nanocomposites by electrospinning. In this paper, in order to improve the interfacial interaction and compatibility between the MWNTs and the matrix, pristine MWNTs were firstly treated with concentrated HNO3 to obtain the acid-functionalized MWNTs, and then the electrospinning solutions are prepared via in-situ polymerization. At last, PI nanofibers and the nanofiber composites with MWNTs were fabricated by electrospinning. The controllable structure such as parallel fiber is formed. The dispersion and alignment morphologies of MWNTs in the electrospun nanofibers, as well as the thermal and mechanical properties of the nanofiber composites, were studied in detail. The relationship between structure and electrical properties of the nanofiber composites are also studied. To sum up, such a homogeneity approach to fabricate high-performance PI/CNTs nanofiber films is a good attempt toward utilizing CNTs in polymer matrices to achieve excellent thermal, electrical, and mechanical properties in practical use.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122738402","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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