Abstract
A novel all-polymeric blend with high dielectric constant (K) has been developed by blending polyvinylidene fluoride (PVDF) and polyamide (PA11) via co-melt-pressing technology with a compatilizer vinyl acetate-maleic anhydride (VA-MA) copolymer. Adding a copolymer of vinyl acetate and maleic anhydride decreased the dielectric loss (tan δ ≈ 0.057) and increased the dielectric constant (Kblend = 15). The blends show high dielectric constants, which give better frequency stability, and excellent mechanical properties. SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial polymer-polymer interactions. FT-IR, DSC and XRD demonstrate that blending PA11 with PVDF affects the crystalline behavior of each component. The high-K polymeric blends created represent a novel type of material that is flexible and easy to process, moreover, is appropriate for flexible micro-electronics.
Highlights
Polyvinylidene fluoride (PVDF) and its polymeric composites, as the typical polymers of electric properties [1,2,3,4], have been widely studied in piezoelectricity and dielectric property since the discovery of their electric properties [5,6]
Because vinyl acetate-maleic anhydride (VA-MA) improves the compatibility between PA11 and PVDF, the dielectric constants of PA11/PVDF blends containing VA-MA increase remarkably (Figure 1b)
We have introduced a simple, efficient, and repeatable route to produce high-K blends composed of PA11 and PVDF
Summary
Polyvinylidene fluoride (PVDF) and its polymeric composites, as the typical polymers of electric properties [1,2,3,4], have been widely studied in piezoelectricity and dielectric property since the discovery of their electric properties [5,6]. Polymers 2014, 6 lead zirconate titanate (PZT)/PVDF composite have been developed, and much attention has been paid to the dielectric properties studies [7,8,9,10]. High content of ceramic powders (usually over 50 vol%) in the polymer composites can enhance the dielectric constant and makes the polymer matrix lose its flexibility and deteriorates the adaptability [11,12,13,14], the mechanical properties, machine-shaping process resulted from the inorganic component has slowed the progress in the application field.
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