Sound absorption properties of spiral vane electrospun PVA/nano particle nanofiber membrane and non-woven composite material
Sound absorption properties of spiral vane electrospun PVA/nano particle nanofiber membrane and non-woven composite material
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DOI：
10.1007/s12221-016-6324-z
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发表时间：
2016-07-01
影响因子：
2.5
通讯作者：
Zuo, Baoqi
中科院分区：
文献类型：
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作者：
Gao, Bing;Zuo, Liuyang;Zuo, Baoqi
在这项研究中，我们制备了一系列的PVA膜负载0重量%，1重量%，3重量%，5重量% ZrO 2和0重量%，1重量%，3重量%，5重量% TiO 2采用旋叶式静电纺丝机分别进行纺丝。TiO 2纳米粒子有两种尺寸：10 nm和200 nm。采用阻抗管在500 ~ 6500 Hz频率范围内测试了针刺非织造布及其与纳米膜复合材料的吸声性能。此外，我们还通过扫描电子显微镜（SEM）和X射线衍射（XRD）对纳米膜的形貌和结晶性能进行了表征。研究了复合材料的吸声性能以及ZrC、TiO 2、纳米颗粒尺寸和空腔深度对吸声性能的影响。结果表明，与针刺非织造布相比，复合材料的吸声性能在整个频率范围内都有所提高。当ZrC纳米颗粒负载后，复合材料的吸声性能向高频区移动，且随着ZrC含量的增加，复合材料在2500 Hz以上的吸声性能更好。而当负载TiO 2时，在较低频率下的吸声性能更好。含3 wt.% TiO 2在500 ~ 1500 Hz频率范围内吸声系数最大。此外，与10 nm的TiO 2相比，200 nm的TiO 2更有利于低频区吸声性能的提高。空气背腔复合材料的吸声性能也向低频方向移动. SEM显示负载TiO 2纳米粒子后，纳米粒子发生了聚集。XRD分析表明，ZrC纳米粒子负载在PVA纳米纤维中后，其晶体结构保持不变，而TiO 2则没有。结果表明，纳米颗粒对吸声材料有一定的影响，不同种类、不同尺寸的纳米颗粒在不同频率范围内的吸声性能都会有所提高。
In this research, we fabricated a series of PVA membranes loaded with 0 wt.%, 1 wt.%, 3 wt.%, 5 wt.% ZrC and 0 wt.%, 1 wt.%, 3 wt.%, 5 wt.% TiO2 using a spiral vane electrospun machine respectively. There were 2 sizes of TiO2 nano particles: 10 nm and 200 nm. We tested sound absorption properties of needle-punched nonwovens as well as the composite of nano membranes and needle-punched nonwovens by an impedance tube at the frequency range from 500 Hz to 6500 Hz. Besides, we tested morphological characterization of nano membranes by scanning electron microscope (SEM) and crystalline properties by X-ray diffraction (XRD). We investigated the sound absorption properties of composites as well as the effect of ZrC, TiO2, nano particle sizes and cavity depth on sound absorption properties. Results showed that sound absorption properties of composites increased at the whole range of frequency compared to those of needle-punched nonwovens. When loaded with ZrC nano particles, sound absorption properties of composite shifted to a higher frequency region, and with increasing content of ZrC, sound absorption properties were better above 2500 Hz. However, when loaded with TiO2, sound absorption properties were better at lower frequency. With 3 wt.% TiO2, sound absorption coefficient reached the best at the frequency range from 500 Hz to 1500 Hz. Besides, 200 nm TiO2 was more conductive to the increase of sound absorption properties at lower frequency region compared to 10 nm TiO2. Sound absorption properties of composites with air back cavity shifted to a lower frequency region, too. SEM showed that there was nano particle aggregation when loaded TiO2 nano particles. XRD showed that ZrC nano particles loaded in PVA nano fiber retained their crystalline structure while TiO2 didn't. It appeared from the results that nano particles had an effect on sound absorption materials, with different kinds and different sizes, sound absorption properties will improve in different ranges of frequency.