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Miscibility of Crystalline Phase in Ferroelectric Blend of Vinylidene Fluoride/trifluoroethylene Copolymer
Bai Baolong1, Zhang Xingyuan*1, Peng Zhi2, Chan Helen Lai-wah3, Choy Chung-loong3
1.Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026;2.Department of Chemistry,Qingdao University,Qingdao 266071;3.Department of Applied Physics and Materials Research Centre,The Hong Kong Polytechnic University,Hong Kong
Abstract:
Ferroelectric blends of vinylidene fluoride(VDF)/ trifluoroethylene(TrFE)copolymer with different molar ratio of 56/44,60/40,63/37,67/33,70/30,73/27 and 77/23 were fabricated by casting from methyl ethyl ketone solution. Wide angle X-ray diffraction shows two peaks(17. 6o and 19. 5o)for all blends and copolymers,associating with amorphous region and(110)(200)reflections,respectively. It indicates that blending does not introduce any new crystal lattice. Analysis of differential scanning calorimetry(DSC)presents that the blends display the phase transition characters of both copolymers of 77/23 and 56/44. The blend components are immiscible in the crystalline phase. Thermally stimulated depolarization current of the blends exhibits the characters of both components at different polarization temperatures. In accordance with DSC results,it also proves that the crystalline phases of 56/44 and 77/23 are just independent. In addition,it is also proved that the space charge can stabilize the remnant polarization to some extent.
Key words:  Thermally stimulated depolarization current,VDF/TrFE blends,Miscibilty
FundProject:
VDF/TrFE共混物晶区相容性的热释电流研究
白宝龙1, 张兴元*1, 彭智2, 陈王丽华3, 蔡忠龙3
1.中国科学技术大学高分子科学与工程系,合肥,230026;2.青岛大学理工学院化学系,青岛,266071;3.香港理工大学应用物理系及材料研究中心,香港
摘要:
采用热释电流(TSDC)技术,结合差热分析和X射线衍射方法,对由共聚物VDF(56)/TrFE(44)和VDF(77)/TrFE(23)共混形成的不同摩尔比的VDF/TrFE共混物进行了研究.发现共混物显示二个居里转变温度,其结晶区域由二个共聚物组分的晶区构成,体现出共混物中二共聚物组分的晶区是不相容的.不同极化温度的热处理共混物的TSDC结果还证明,空间电荷对剩余极化有一定的稳定作用.
关键词:  热释电流  VDF/TrFE共混物  相容性
DOI:10.1088/1674-0068/17/4/499-502
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