Polymorphism, piezoelectricity and sound absorption of electrospun PVDF membranes with and without carbon nanotubes

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• 作者：Chang Mou Wu ; ^{cmwu@mail.ntust.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Min Hui Chou
• 关键词：Functional composites ; Carbon nanotubes ; Piezoelectric properties ; Electrospinning ; Polyvinylidene fluoride
• 刊名：Composites Science and Technology
• 出版年：2016
• 出版时间：28 April 2016
• 年：2016
• 卷：127
• 期：Complete
• 页码：127-133
• 全文大小：1802 K

文摘

In this study, a novel sound-absorbing material was developed using electrospun piezoelectric Polyvinylidene fluoride (PVDF) membranes. Effects of carbon nanotubes (CNTs) and electrospinning on the crystal structure and piezoelectric properties of PVDF/CNT nanofiber membranes were examined. Results showed that electrospinning effectively induced the β phase formation and increased piezoelectricity. Adding CNTs further improved the piezoelectricity through interfacial polarization. Electrospun nanofiber membranes exhibited high surface area providing a large number of contact sites with the sound waves. This resulted in higher sound energy absorption in the middle-frequency region by friction/vibration mechanisms. The piezoelectric electrospun PVDF samples are crucial in converting sound energy to electric potential and absorbing sound waves in a low-frequency region. Sound absorption of the electrospun PVDF/CNT membranes with the highest piezoelectricity was shifted further toward low-frequency region. It was shown that electrospun PVDF covered acoustic foam is an efficient sound absorber because of its favorable absorption performance, particularly in the low- and middle-frequency regions.