用硅烷和钛酸酯偶联剂对 Ba Ti O3粉进行了表面处理 ,使用溶剂法制备了 PVDF/Ba Ti O3复合薄膜。通过疏水亲油实验定性地分析了硅烷和钛酸酯偶联剂对 Ba Ti O3粉的偶联作用可以改善 PVDF/Ba-Ti O3的界面结合 ,通过测定 PVDF/Ba Ti O3的...用硅烷和钛酸酯偶联剂对 Ba Ti O3粉进行了表面处理 ,使用溶剂法制备了 PVDF/Ba Ti O3复合薄膜。通过疏水亲油实验定性地分析了硅烷和钛酸酯偶联剂对 Ba Ti O3粉的偶联作用可以改善 PVDF/Ba-Ti O3的界面结合 ,通过测定 PVDF/Ba Ti O3的介电常数和介电损耗角正切值表征了复合材料的介电性能 ,PVDF/Ba Ti O3扫描电子显微镜 (SEM)的微观形态分析发现 ,经过偶联剂表面处理 ,Ba Ti O3粉在PVDF中的分散情况改善 。展开更多
BaTiO 3/ PVDF nanocomposites were prepared via in-situ growth of nanosized BaTiO 3 particles in PVDF matrix by using the sol-gel method.The present elements of BaTiO 3/PVDF nanocomposites were analyzed by an electr...BaTiO 3/ PVDF nanocomposites were prepared via in-situ growth of nanosized BaTiO 3 particles in PVDF matrix by using the sol-gel method.The present elements of BaTiO 3/PVDF nanocomposites were analyzed by an electron probe X-ray microanalyser.Nanosized BaTiO 3 grown in the composite films was characterized by an X-ray diffractometer and a transmission electron microscope,and the dielectric properties of the composite films were measured.The distribution of BaTiO 3 nanoparticles in-situ grown in the PVDF matrix was examined using a scanning electron microscope.展开更多
A series of 0-3 composites of the polyvinylidene fluoride (PVDF) and BaTiO 3 was prepared.BaTiO 3 was modified with titanate coupling agent.The dielectric properties and the interfacial interaction of composites by ...A series of 0-3 composites of the polyvinylidene fluoride (PVDF) and BaTiO 3 was prepared.BaTiO 3 was modified with titanate coupling agent.The dielectric properties and the interfacial interaction of composites by different preparation methods were examined and compared.The result shows that the relative dielectric constant ε of the composite prepared in solution has a maximum value at about 70% weight fraction of BaTiO 3 and the dielectric loss tanδ increases rapidly when the fraction exceeds 70%.For the composite prepared in melt,the relative dielectric constant ε almost reaches a maximum value at about 60% weight fraction of BaTiO 3 and the dielectric loss is comparatively lower.The dielectric properties of composites are improved by using a coupling agent.展开更多
In this paper,low temperature plasma is used to modify the surface of barium titanate（BaTiO3）nanoparticles in order to enhance the interfacial compatibility between ferroelectric poly（vinylidene fluoride）（PVDF） ...In this paper,low temperature plasma is used to modify the surface of barium titanate（BaTiO3）nanoparticles in order to enhance the interfacial compatibility between ferroelectric poly（vinylidene fluoride）（PVDF） and BaTiO3 nanoparticles.The results demonstrate that oxygenic groups are successfully attached to the BaTiO3 surface,and the quantity of the functional groups increases with the treatment voltage.Furthermore,the effect of modified BaTiO3 nanoparticles on the morphology and crystal structure of the PVDF/BaTiO3 membrane is investigated.The results reveal that the dispersion of BaTiO3 nanoparticles in the PVDF matrix was greatly improved due to the modification of the BaTiO3 nanoparticles by air plasma.It is worth noting that the formation of a β-phase in a PVDF/modified BaTiO3 membrane is observably promoted,which results from the strong interaction between PVDF chains and oxygenic groups fixed on the BaTiO3 surface and the better dispersion of BaTiO3 nanoparticles in the PVDF matrix.Besides,the PVDF/modified BaTiO3 membrane at the treatment voltage of 24 k V exhibits a lower water contact angle（≈68.4°） compared with the unmodified one（≈86.7°）.Meanwhile,the dielectric constant of PVDF/BaTiO3 nanocomposites increases with the increase of working voltage.展开更多
The piezoelectric composites containing highly oriented BaTiO3 whiskers as active phase and PVDF as matrix have been prepared by micro-hole extrusion and orientation in carried fibers. The morphology of oriented BaTiO...The piezoelectric composites containing highly oriented BaTiO3 whiskers as active phase and PVDF as matrix have been prepared by micro-hole extrusion and orientation in carried fibers. The morphology of oriented BaTiO3 whiskers and microstructure of the composites were observed by SEM. As for its electromechanical properties, it is found that the dielectric constant, piezoelectric constant and remnant of polarization in the BaTiO3 whisker-PVDF composite are considerably higher than that in the BaTiO3 powders-PVDF composite, while the loss factors follow the opposite trend. For the BaTiO3 whisker-PVDF composite, the values of ε, d33 and Pr parallel to the whisker orientation (normal specimen) are much higher than that perpendicular to the whisker orientation (parallel specimen). The significant effects of the connective passages of active phase on electromechanical properties of the piezoelectric composites has also been investigated.展开更多
To enhance the piezoelectric performance of piezoelectric polymer thin films in general,hybrid polyvinylidene difluoride(PVDF)and nanosized barium titanate(BaTiO_(3))piezoelectric films were prepared and their piezoel...To enhance the piezoelectric performance of piezoelectric polymer thin films in general,hybrid polyvinylidene difluoride(PVDF)and nanosized barium titanate(BaTiO_(3))piezoelectric films were prepared and their piezoelectric performance examined.The hybrid nanofibers were fabricated via electrospinning at an external voltage of 15 kV.The nonwoven fabrics were collected using a roller collection device,and their morphological structures were analyzed via scanning electron microscopy.The crystal structures of these piezoelectric films were characterized via micro-Raman spectroscopy.β-phase of the composite nanofiber membrane almost increased to twice owing to the addition of BaTiO_(3)nanoparticles.Compared with pure,electrospun PVDF piezoelectric film,the piezoelectric characteristics of the hybrid piezoelectric films were considerably enhanced because of the additional BaTiO_(3)nanoparticles.The maximum instantaneous open-circuit voltage of the hybrid PVDF-BaTiO_(3)nanofibers film can be high up to 80 V.The high-performance hybrid piezoelectric films exhibited notable prospects for applications in wearable electronic textiles.展开更多
文摘用硅烷和钛酸酯偶联剂对 Ba Ti O3粉进行了表面处理 ,使用溶剂法制备了 PVDF/Ba Ti O3复合薄膜。通过疏水亲油实验定性地分析了硅烷和钛酸酯偶联剂对 Ba Ti O3粉的偶联作用可以改善 PVDF/Ba-Ti O3的界面结合 ,通过测定 PVDF/Ba Ti O3的介电常数和介电损耗角正切值表征了复合材料的介电性能 ,PVDF/Ba Ti O3扫描电子显微镜 (SEM)的微观形态分析发现 ,经过偶联剂表面处理 ,Ba Ti O3粉在PVDF中的分散情况改善 。
文摘BaTiO 3/ PVDF nanocomposites were prepared via in-situ growth of nanosized BaTiO 3 particles in PVDF matrix by using the sol-gel method.The present elements of BaTiO 3/PVDF nanocomposites were analyzed by an electron probe X-ray microanalyser.Nanosized BaTiO 3 grown in the composite films was characterized by an X-ray diffractometer and a transmission electron microscope,and the dielectric properties of the composite films were measured.The distribution of BaTiO 3 nanoparticles in-situ grown in the PVDF matrix was examined using a scanning electron microscope.
基金theNationalNaturalScienceFoundationofChina (No .5 0 172 0 10 )
文摘A series of 0-3 composites of the polyvinylidene fluoride (PVDF) and BaTiO 3 was prepared.BaTiO 3 was modified with titanate coupling agent.The dielectric properties and the interfacial interaction of composites by different preparation methods were examined and compared.The result shows that the relative dielectric constant ε of the composite prepared in solution has a maximum value at about 70% weight fraction of BaTiO 3 and the dielectric loss tanδ increases rapidly when the fraction exceeds 70%.For the composite prepared in melt,the relative dielectric constant ε almost reaches a maximum value at about 60% weight fraction of BaTiO 3 and the dielectric loss is comparatively lower.The dielectric properties of composites are improved by using a coupling agent.
基金financial support from the Opening Project of the State Key Laboratory of Polymer Materials Engineering (Sichuan University) (Grant No.Sklpme2015-4-24)the Provincial Department of Education Science General Foundation of Liaoning (Contract No.L2015017)
文摘In this paper,low temperature plasma is used to modify the surface of barium titanate（BaTiO3）nanoparticles in order to enhance the interfacial compatibility between ferroelectric poly（vinylidene fluoride）（PVDF） and BaTiO3 nanoparticles.The results demonstrate that oxygenic groups are successfully attached to the BaTiO3 surface,and the quantity of the functional groups increases with the treatment voltage.Furthermore,the effect of modified BaTiO3 nanoparticles on the morphology and crystal structure of the PVDF/BaTiO3 membrane is investigated.The results reveal that the dispersion of BaTiO3 nanoparticles in the PVDF matrix was greatly improved due to the modification of the BaTiO3 nanoparticles by air plasma.It is worth noting that the formation of a β-phase in a PVDF/modified BaTiO3 membrane is observably promoted,which results from the strong interaction between PVDF chains and oxygenic groups fixed on the BaTiO3 surface and the better dispersion of BaTiO3 nanoparticles in the PVDF matrix.Besides,the PVDF/modified BaTiO3 membrane at the treatment voltage of 24 k V exhibits a lower water contact angle（≈68.4°） compared with the unmodified one（≈86.7°）.Meanwhile,the dielectric constant of PVDF/BaTiO3 nanocomposites increases with the increase of working voltage.
文摘The piezoelectric composites containing highly oriented BaTiO3 whiskers as active phase and PVDF as matrix have been prepared by micro-hole extrusion and orientation in carried fibers. The morphology of oriented BaTiO3 whiskers and microstructure of the composites were observed by SEM. As for its electromechanical properties, it is found that the dielectric constant, piezoelectric constant and remnant of polarization in the BaTiO3 whisker-PVDF composite are considerably higher than that in the BaTiO3 powders-PVDF composite, while the loss factors follow the opposite trend. For the BaTiO3 whisker-PVDF composite, the values of ε, d33 and Pr parallel to the whisker orientation (normal specimen) are much higher than that perpendicular to the whisker orientation (parallel specimen). The significant effects of the connective passages of active phase on electromechanical properties of the piezoelectric composites has also been investigated.
基金The National Natural Science Foundation of China(No.52375563)the Science and Technology on Avionics Integration Laboratory(No.201913069001,20200055069001).
文摘To enhance the piezoelectric performance of piezoelectric polymer thin films in general,hybrid polyvinylidene difluoride(PVDF)and nanosized barium titanate(BaTiO_(3))piezoelectric films were prepared and their piezoelectric performance examined.The hybrid nanofibers were fabricated via electrospinning at an external voltage of 15 kV.The nonwoven fabrics were collected using a roller collection device,and their morphological structures were analyzed via scanning electron microscopy.The crystal structures of these piezoelectric films were characterized via micro-Raman spectroscopy.β-phase of the composite nanofiber membrane almost increased to twice owing to the addition of BaTiO_(3)nanoparticles.Compared with pure,electrospun PVDF piezoelectric film,the piezoelectric characteristics of the hybrid piezoelectric films were considerably enhanced because of the additional BaTiO_(3)nanoparticles.The maximum instantaneous open-circuit voltage of the hybrid PVDF-BaTiO_(3)nanofibers film can be high up to 80 V.The high-performance hybrid piezoelectric films exhibited notable prospects for applications in wearable electronic textiles.
