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Synthesis and Properties of Novel Piezoelectric Polyimide Composites

Author: LuYanBin
Tutor: WangJinYan;ZuoXiGao
School: Dalian University of Technology
Course: Materials Science
Keywords: Polymer -based piezoelectric composites High temperature Piezoelectric coefficient Polyimide Phthalazinone structure
Type: Master's thesis
Year: 2007
Downloads: 208
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Polymer-based piezoelectric composite is a multiphase material it is made of piezoelectric ceramic and polymer composite technology constitutes a new functional materials. This material combines the advantages of the two-phase material: it has good flexibility and mechanical processing properties, to overcome the brittle and difficult to process into various shapes disadvantage as compared with the conventional piezoelectric ceramic (or single crystal); sound impedance, easy acoustic impedance matching with air, water and biological tissues; dielectric constant is also reduced, so the water the seiyuu value, piezoelectric voltage coefficient and pyroelectric detection of merit increases to improve the sensitivity of the transducer and detector . Compared with the piezoelectric polymer, has a high piezoelectric constant and electromechanical coupling coefficient. This article having superior thermal stability, chemical resistance and good mechanical strength of the polyimide as a polymer matrix, select the BTL of barium titanium oxide as a dopant, by the two-step method was successfully synthesized four doped the miscellaneous ceramic powder BTL polyimide composite films were fully characterized. 1. One-step synthesis of polyimide DBPDA / DHPZ-DAM and fluorinated polyimide 6FDA/DHPZ-DAM, optimize the synthesis process, based on the comparison of its solubility, thermal and piezoelectric properties, select the fluorinated The polyimide 6FDA/DHZ-DAM as the polymer matrix. 2. Ceramic powder BTL 2 Ti (OBu) 4 and acetic acid made of barium titanium precursors using Ba (CH 3 COO) The sol-gel synthesis, by infrared spectroscopy and X-ray diffraction pattern proved that complete conversion to 650 ° C BTL of BaTiO 3 crystal. 3. The two-step synthesis of ceramic powder-containing polyimide composites. First synthesizing polyamic acid solution and optimize the synthesis process, the intrinsic viscosity of 1.265dl / g of the concentrated solution of the polyamic acid, and then the ceramic powder BTL homemade added to the polyamic acid solution, after the completion of the reaction, the slides were capped film, and thermal curing, to optimize the curing process. 4. A four BTL/6FDA/DHPZ-DAM polymer piezoelectric composites synthesized by the above method: 05 the PI F the PI F 10, the PI F < / sub> 15, PI F 20. The class composite materials exhibit a good solubility and to maintain the excellent heat resistance. All of the composite material can be dissolved in a common aprotic polar solvents, such as N-methyl pyrrolidone (NMP), chloroform (the CHCI 3 ), and the like; its glass transition temperature at 250 ° C or more, under a nitrogen atmosphere, the 5% thermal weight loss temperature above 420 ℃; scanning electron microscope SEM characterization of the distribution of the ceramic particles in the polymer system when BTL content of less than 20%, BTL particulates evenly distributed ; quasi-static d 33 measuring instrument test its piezoelectric properties, the results show that the incorporation of the ceramic powder is effective to improve the piezoelectric properties of the polyimide, from the PI F < upgrade to PI F 15 of 12.5pc / N / sub> 00 5.3pc / N. However, with the BTL content increases, the thermal performance of the composite material is decreased, and the composite film surface cracking occurs. When BTL is 15%, the most excellent comprehensive performance piezoelectric composites. In this study, to further explore how to improve the performance of such a high temperature piezoelectric composite piezoelectric possible.

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