环氧树脂基压电阻尼复合材料的制备与性能研究
发布时间：2018-10-18 08:20
【摘要】：压电阻尼材料通常是指在聚合物基体中加入压电陶瓷颗粒和导电粒子而制备的一类新型智能阻尼材料。在受到振动作用时,压电阻尼材料通过压电效应实现机械能向电能的转化,导电粒子再将电能在材料内部传导和转化并最终以热能的形式耗散掉。聚(3,4-乙烯二氧噻吩)是噻吩衍生物类导电高分子材料,英文缩写为PEDOT。采用化学氧化法制备PEDOT/PMN功能粉末,六水三氯化铁作为氧化剂,聚苯乙烯磺酸钠(PSSNa)作为掺杂剂,按照比例向圆底烧瓶中添加3,4-乙烯二氧噻吩(EDOT)单体、PMN颗粒、氧化剂和掺杂剂,在室温下搅拌反应40小时后过滤,烘干后研磨制得PEDOT/PMN包覆粉末。通过FT-IR、XRD测试分析,证明成功合成了掺杂态的导电高分子PEDOT;通过扫描电镜观察到,当PEDOT体积含量达到50%时,压电陶瓷被完全包覆,PEDOT在颗粒表面分布较为均匀;采用四探针法测量电导率,随着PEDOT体积含量的增加,电导率增大,50%(v/v)包覆试样电导率达到2.71×10-3S/cm。对试样进行粒度分析,经过长时间搅拌反应生成的包覆粉末粒度减小,粒径分布范围也变窄。将制备的PEDOT/PMN包覆粉末作为功能相添加到环氧树脂CYD-127中制得压电阻尼复合材料后,对其力学和阻尼性能进行测试研究。力学性能的测试结果表明,在功能相质量分数为60%时,制备复合材料的压缩强度和弯曲强度达到最大值。分析研究了功能相种类和含量等对压电和介电性能影响,对于压电性能,功能粉末含量越大,压电性能越好;当功能粉末含量一定时,导电相PEDOT含量越大,压电常数越小。而对于介电性能,功能相含量增大提高复合材料的介电性能。对于导电性能,材料的电导率随PEDOT含量的增加而增大;当功能相为50%(v/v)的PEDOT/PMN粉末,质量分数为60%时,在制备时选用改性甲基四氢苯酐作为固化剂的试样电导率可达2.92×10-6S/cm;研究分析了复合材料的阻尼性能,功能相添加量为15%、30%、45%和60%,复合材料的阻尼性能与电导率有类似的规律,在50%(v/v)、60%wt PEDOT/PMN时的阻尼损耗因子峰值βmax为0.621,有效阻尼温域?T为36.4℃。
[Abstract]:Piezoelectric damping material is a kind of new intelligent damping material which is usually prepared by adding piezoelectric ceramic particles and conductive particles into polymer matrix. When the piezoelectric damping material is subjected to vibration, the mechanical energy is converted to electric energy by piezoelectric effect, and the electrical energy is transmitted and converted by conducting particles in the material and dissipated in the form of heat energy. Poly (3O4-ethylenedioxythiophene) is a kind of conductive polymer material of thiophene derivatives, abbreviated as PEDOT.. The PEDOT/PMN functional powder was prepared by chemical oxidation method. Ferric chloride hexahydrate was used as oxidant, sodium polystyrene sulfonate (PSSNa) was used as dopant, and 3O4-ethylenedioxythiophene (EDOT) monomer, PMN particle, oxidant and dopant were added to the flask in proportion. PEDOT/PMN coated powder was prepared by stirring at room temperature for 40 hours after filtration, drying and grinding. By FT-IR,XRD analysis, it was proved that the doped conductive polymer PEDOT; was successfully synthesized. It was observed by SEM that when the volume content of PEDOT reached 50%, the piezoelectric ceramics were completely coated, and the distribution of PEDOT on the surface of the particles was more uniform. The conductivity was measured by four-probe method. With the increase of volume content of PEDOT, the conductivity of 50% (v / v) coated sample was 2.71 脳 10 ~ (-3) S / cm ~ (-1). The particle size of the coated powder after a long agitation reaction was reduced and the particle size distribution range was also narrowed by analyzing the particle size of the sample. The piezoelectric damping composites were prepared by adding the prepared PEDOT/PMN coated powder as functional phase to epoxy resin CYD-127. The mechanical and damping properties of the composites were investigated. The test results of mechanical properties show that when the mass fraction of functional phase is 60, the compressive strength and bending strength of the composites reach the maximum. The effects of functional phase type and content on piezoelectric and dielectric properties are studied. For piezoelectric properties, the larger the content of functional powder, the better the piezoelectric performance, and when the content of functional powder is fixed, the larger the PEDOT content of conductive phase is, the smaller the piezoelectric constant is. For dielectric properties, the increase of functional phase content improves the dielectric properties of composites. For electrical conductivity, the conductivity of the material increases with the increase of PEDOT content, and when the functional phase is 50% (v / v), the mass fraction of PEDOT/PMN powder is 60%. The electrical conductivity of the sample with modified methyltetrahydrophthalic anhydride as curing agent can reach 2.92 脳 10 ~ (-6) S / cm. The damping properties of the composites are studied and analyzed. The damping properties of the composites are 15 ~ 30% and 60% respectively. The damping properties of the composites are similar to those of the electrical conductivity. At 50% (v / v), the peak value of damping loss factor 尾 max at 60%wt PEDOT/PMN is 0.621, and the effective damping temperature range? t is 36.4 鈩，
本文编号：2278543
[Abstract]:Piezoelectric damping material is a kind of new intelligent damping material which is usually prepared by adding piezoelectric ceramic particles and conductive particles into polymer matrix. When the piezoelectric damping material is subjected to vibration, the mechanical energy is converted to electric energy by piezoelectric effect, and the electrical energy is transmitted and converted by conducting particles in the material and dissipated in the form of heat energy. Poly (3O4-ethylenedioxythiophene) is a kind of conductive polymer material of thiophene derivatives, abbreviated as PEDOT.. The PEDOT/PMN functional powder was prepared by chemical oxidation method. Ferric chloride hexahydrate was used as oxidant, sodium polystyrene sulfonate (PSSNa) was used as dopant, and 3O4-ethylenedioxythiophene (EDOT) monomer, PMN particle, oxidant and dopant were added to the flask in proportion. PEDOT/PMN coated powder was prepared by stirring at room temperature for 40 hours after filtration, drying and grinding. By FT-IR,XRD analysis, it was proved that the doped conductive polymer PEDOT; was successfully synthesized. It was observed by SEM that when the volume content of PEDOT reached 50%, the piezoelectric ceramics were completely coated, and the distribution of PEDOT on the surface of the particles was more uniform. The conductivity was measured by four-probe method. With the increase of volume content of PEDOT, the conductivity of 50% (v / v) coated sample was 2.71 脳 10 ~ (-3) S / cm ~ (-1). The particle size of the coated powder after a long agitation reaction was reduced and the particle size distribution range was also narrowed by analyzing the particle size of the sample. The piezoelectric damping composites were prepared by adding the prepared PEDOT/PMN coated powder as functional phase to epoxy resin CYD-127. The mechanical and damping properties of the composites were investigated. The test results of mechanical properties show that when the mass fraction of functional phase is 60, the compressive strength and bending strength of the composites reach the maximum. The effects of functional phase type and content on piezoelectric and dielectric properties are studied. For piezoelectric properties, the larger the content of functional powder, the better the piezoelectric performance, and when the content of functional powder is fixed, the larger the PEDOT content of conductive phase is, the smaller the piezoelectric constant is. For dielectric properties, the increase of functional phase content improves the dielectric properties of composites. For electrical conductivity, the conductivity of the material increases with the increase of PEDOT content, and when the functional phase is 50% (v / v), the mass fraction of PEDOT/PMN powder is 60%. The electrical conductivity of the sample with modified methyltetrahydrophthalic anhydride as curing agent can reach 2.92 脳 10 ~ (-6) S / cm. The damping properties of the composites are studied and analyzed. The damping properties of the composites are 15 ~ 30% and 60% respectively. The damping properties of the composites are similar to those of the electrical conductivity. At 50% (v / v), the peak value of damping loss factor 尾 max at 60%wt PEDOT/PMN is 0.621, and the effective damping temperature range? t is 36.4 鈩，
本文编号：2278543
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