CaCO3/PVDF電紡纖維膜之吸音性能研究

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題名:	CaCO3/PVDF電紡纖維膜之吸音性能研究 Study on Sound Absorption Properties of Electrospun CaCO3/PVDF Membrane
作者:	張俊彥
貢獻者:	化學工程與材料工程學系奈米材料碩士班
關鍵詞:	聚偏二氟乙烯靜電紡絲碳酸鈣 PVDF奈米纖維膜體密度孔隙結構協同效應
日期:	2023
上傳時間:	2023-07-27 15:00:56 (UTC+8)
摘要:	噪音汙染與水汙染、空氣汙染及固體廢棄物汙染並稱為當代四大汙染。隨著社會經濟繁榮與科技快速發展，噪音汙染所帶來的影響也日益嚴重，使用吸音材料成了降低噪音的主要解決方法，為了提高吸音效果，增加厚度及重量是不二法門，但這樣不僅增加成本與重量，在使用上也造成許多限制。本研究以聚偏二氟乙烯(PVDF)添加碳酸鈣(CaCO3)之靜電紡絲膜，以及將碳酸鈣溶解後成為具突出型態的聚偏二氟乙烯(PVDF)靜電紡絲膜，並且複合熔噴不織布吸音材，藉由提升吸音材的面密度與較高的比表面積，使聲能與結構碰撞時，提升纖維類材料對於中低頻的吸音效果，同時能減少材料的使用，使原本所需要熔噴不織布使用的重量及厚度減少，且增加吸音材使用上的方便性。 PVDF奈米纖維膜在添加碳酸鈣後，使纖維表面產生大量凸起的奈米顆粒，使聲波進入材料內部時碰撞後被分散使能量降低，且提升體密度後有助於提升中低頻吸收效果，基重20 g/m2後PVDF奈米纖維膜SAA值為0.28，而2 wt% CaCO3/PVDF奈米纖維膜SAA為0.47，整體吸音效果明顯提升，基重提升至40 g/m2後，因纖維膜體密度的增加，聲波無法通過材料內部，高頻聲波於表面被奈米纖維反射降低能量，致使高頻吸音性能下降，而C1 %SAA值為0.49，因有最高的比表面積且其具有最佳的孔隙結構，得到其孔隙結構與密度產生協同效應，整體吸音效果最佳。 Noise, water, air, and solid waste pollution are considered the four major types of pollution. Rapid economic growth and technological development have led to increasingly severe noise pollution, which is mainly mitigated by sound absorbing materials. Increasing the thickness and weight of such materials is the primary approach to improving their sound absorption efficiency, but it also imposes various limitations in practice due to the increased cost and material weight. In this study, an electrospinning film made of polyvinylidene difluoride (PVDF) mixed with CaCO3 was used to create a melt-blown non-woven fabric as a composite sound absorbing material. Adding CaCO3 creates bumps on the PVDF film surface, and the material exhibits increased areal density and specific surface area, thereby improving its sound absorption efficiency with regard to incoming sound waves of mid to low frequency. This approach also reduces the amount of sound absorbing material required to achieve satisfactory sound absorption efficiency, and the reduction in non-woven fabric thickness and weight increases the versatility of the developed composite material. The results showed that after CaCO3 was mixed with a PVDF nanofiber film, it created numerous nanoparticle bumps on the nanofiber surface, which dispersed incoming sound waves and dissipated the sound wave energy. The increased bulk density also improved the material’s efficiency in absorbing incoming sound waves of mid to low frequency. The PVDF nanofiber film with a basis weight of 20 g/m2 exhibited a sound absorption average of 0.28, whereas that of the 2 wt% CaCO3/PVDF nanofiber film increased notably to 0.47. When the basis weight was increased to 40 g/m2, the increased bulk density of the nanofiber film prevented sound waves from penetrating the material. Consequently, high-frequency sound waves were deflected on the surface, which resulted in a decrease in sound absorption efficiency against high-frequency sound waves. When the C1 % sound absorption average was 0.49, the highest specific surface area and optimal porous structure were achieved, and the synergistic effect generated through the material density and porous structure yielded the highest sound absorption efficiency.
顯示於類別:	[化學工程與材料工程學系暨碩士班] 博碩士論文

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