【摘要】：壓電阻尼材料通常是指在聚合物基體中加入壓電陶瓷顆粒和導(dǎo)電粒子而制備的一類新型智能阻尼材料。在受到振動(dòng)作用時(shí),壓電阻尼材料通過(guò)壓電效應(yīng)實(shí)現(xiàn)機(jī)械能向電能的轉(zhuǎn)化,導(dǎo)電粒子再將電能在材料內(nèi)部傳導(dǎo)和轉(zhuǎn)化并最終以熱能的形式耗散掉。聚(3,4-乙烯二氧噻吩)是噻吩衍生物類導(dǎo)電高分子材料,英文縮寫(xiě)為PEDOT。采用化學(xué)氧化法制備PEDOT/PMN功能粉末,六水三氯化鐵作為氧化劑,聚苯乙烯磺酸鈉(PSSNa)作為摻雜劑,按照比例向圓底燒瓶中添加3,4-乙烯二氧噻吩(EDOT)單體、PMN顆粒、氧化劑和摻雜劑,在室溫下攪拌反應(yīng)40小時(shí)后過(guò)濾,烘干后研磨制得PEDOT/PMN包覆粉末。通過(guò)FT-IR、XRD測(cè)試分析,證明成功合成了摻雜態(tài)的導(dǎo)電高分子PEDOT;通過(guò)掃描電鏡觀察到,當(dāng)PEDOT體積含量達(dá)到50%時(shí),壓電陶瓷被完全包覆,PEDOT在顆粒表面分布較為均勻;采用四探針?lè)y(cè)量電導(dǎo)率,隨著PEDOT體積含量的增加,電導(dǎo)率增大,50%(v/v)包覆試樣電導(dǎo)率達(dá)到2.71×10-3S/cm。對(duì)試樣進(jìn)行粒度分析,經(jīng)過(guò)長(zhǎng)時(shí)間攪拌反應(yīng)生成的包覆粉末粒度減小,粒徑分布范圍也變窄。將制備的PEDOT/PMN包覆粉末作為功能相添加到環(huán)氧樹(shù)脂CYD-127中制得壓電阻尼復(fù)合材料后,對(duì)其力學(xué)和阻尼性能進(jìn)行測(cè)試研究。力學(xué)性能的測(cè)試結(jié)果表明,在功能相質(zhì)量分?jǐn)?shù)為60%時(shí),制備復(fù)合材料的壓縮強(qiáng)度和彎曲強(qiáng)度達(dá)到最大值。分析研究了功能相種類和含量等對(duì)壓電和介電性能影響,對(duì)于壓電性能,功能粉末含量越大,壓電性能越好;當(dāng)功能粉末含量一定時(shí),導(dǎo)電相PEDOT含量越大,壓電常數(shù)越小。而對(duì)于介電性能,功能相含量增大提高復(fù)合材料的介電性能。對(duì)于導(dǎo)電性能,材料的電導(dǎo)率隨PEDOT含量的增加而增大;當(dāng)功能相為50%(v/v)的PEDOT/PMN粉末,質(zhì)量分?jǐn)?shù)為60%時(shí),在制備時(shí)選用改性甲基四氫苯酐作為固化劑的試樣電導(dǎo)率可達(dá)2.92×10-6S/cm;研究分析了復(fù)合材料的阻尼性能,功能相添加量為15%、30%、45%和60%,復(fù)合材料的阻尼性能與電導(dǎo)率有類似的規(guī)律,在50%(v/v)、60%wt PEDOT/PMN時(shí)的阻尼損耗因子峰值βmax為0.621,有效阻尼溫域?T為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，

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