Nanoparticle and Process Induced Super Toughened Piezoelectric Hybrid Materials: The Effect of Stretching on Filled System

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• 作者：Vimal K. Tiwari ; Amit K. Prasad ; Vaishali Singh ; Karun K. Jana ; Manjusri Misra ; C. Durga Prasad ; Pralay Maiti
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：July 23, 2013
• 年：2013
• 卷：46
• 期：14
• 页码：5595-5603
• 全文大小：578K
• 年卷期：v.46,no.14(July 23, 2013)
• ISSN：1520-5835

文摘

Process and nanoparticle induced piezoelectric super toughened poly(vinylidene fluoride) (PVDF) nanohybrids have been demonstrated. The nanohybrids have been prepared by incorporating organically modified nanoclay through melt extrusion and solution route. The solution processed nanohybrid exhibit 1100% improvement in toughness as well as adequate stiffness as compared to pure PVDF without any trade-off. The structural and morphological origins of super toughening phenomena have been worked out. The unique crystallization behavior of PVDF on top of the silicate layers (尾-phase, planar zigzag chain conformation, and subsequent polar 纬-phase and 伪-phase as layered type) has been revealed to create an island type of structure, which in turn is responsible for greater toughness. The extent of piezoelectric 尾-phase has been enhanced by controlled stretching of the nanohybrid at moderately high temperature for better disentanglement, and 90% of the piezoelectric phase has been stabilized. The structural change over has been confirmed through XRD, FTIR, and DSC studies. The nanohybrids possess 尾-phase with a small amount of 伪-phase and distorted 纬-phase (T₃G-T₆G) before stretching which convert into predominantly 尾-phase with increasing the draw ratio, whereas pure PVDF converted directly into 尾-phase from pure 伪-phase. The piezoelectric coefficient (d₃₃) exhibits significant increase with draw ratio, and the relative enhancement is more in nanohybrid vis-脿-vis pure PVDF arising from the presence of greater 尾-phase leading to super toughened lightweight piezoelectric material.