Significantly Improved Dielectric Performance of All‐Organic Parylene/Polyimide/Parylene Composite Films with Sandwich Structure

Abstract

The development of novel polymer dielectrics with enhanced dielectric performance is a great challenge for application of film capacitors in modern electronics and electrical systems. Herein, an innovative approach of chemical vapor deposition polymerization technology is proposed to prepare the all-organic sandwich structured parylene/polyimide/parylene (Py/PI/Py) composite films by employing poly(chloro-para-xylylene) (parylene C) as the outer layers and polyimide (PI) as the inner layer. The Py/PI/Py composites exhibit superior thermal resistance and outstanding mechanical properties. Moreover, thanks to the interfacial effect which contributes to reinforcing the dielectric response and the thickness effect which facilitates improving the breakdown strength, the dielectric performance of Py/PI/Py composites has been enhanced significantly. Accordingly, dielectric constant of 4.52-5.09, dissipation factor of 0.21-1.01%, and breakdown strength of 307-460 MV m −1 are achieved. Besides, notable energy storage performance is also obtained in Py/PI/Py composite dielectrics. Consequently, this novel application of chemical vapor deposition polymerization method in preparing all-organic multilayered polymer composite films with sandwich structure shows promising potential in film capacitor applications in harsh conditions.

Ultrahigh efficiency and enhanced discharge energy density at low loading of nanofiller in trilayered polyvinylidene fluoride‐Ba0.8Sr0.2TiO3 nanocomposites

“…Polymer chain mobility, chain conformation, coulombic potential, crystallinity, etc., also affect the dielectric permittivity in the single‐layer PVDF‐BST nanocomposites 36,37 . But in the present case, redistribution of interfacial local electric field between the layers of PVDF‐BST nanocomposites leads to induced polarization 38,39 . The interaction between two layers also creates interfacial dipoles 40,41 .…”

“…36,37 But in the present case, redistribution of interfacial local electric field between the layers of PVDF-BST nanocomposites leads to induced polarization. 38,39 The interaction between two layers also creates interfacial dipoles. 40,41 The induced polarization between the layers and the creation of interfacial dipoles are responsible for the increased dielectric permittivity.…”

Scalable co-cured polyimide/poly(p-phenylene benzobisoxazole) all-organic composites enabling improved energy storage density, low leakage current and long-term cycling stability

“…9 summarizes the relevant outputs of comprehensive properties including energy storage density, breakdown strength and dielectric loss for all-organic or PBO-based dielectrics in the past decade. [32][33][34][39][40][41][42][43][44][45][46] These outputs can be categorized roughly as three types. The first type includes PI, PMMA, PBTMD-SO 2 and PTMD-SO 2 as well as Al 2 O 3 @NaNbO 3 / PBO, all of which exhibit high dielectric loss (40.06) while the breakdown strength is also below 400 kV mm À1 ; the second type is those that have reduced dielectric loss (o0.03) although the breakdown is still not very high (o400 kV mm À1 ).…”

Interface modified BTO@PS-co-mah/PS composite dielectrics with enhanced breakdown strength and ultralow dielectric loss

“…Thus far, there are various strategies to optimize the dielectric performance, such as intrinsic polymer dielectrics, 12–16 all-organic composite polymer dielectrics 17–22 and inorganic filler/organic matrix composite dielectrics. 10,23–27 Among all the methods, the organic/inorganic composite dielectrics combining the high- ε r inorganic fillers and a high- E b polymer matrix would take advantage of both components.…”

“…6 Consequently, many efforts have been devoted to pursuing enhanced permittivity and breakdown strength while reducing the dissipation factor. Thus far, there are various strategies to optimize the dielectric performance, such as intrinsic polymer dielectrics, [12][13][14][15][16] allorganic composite polymer dielectrics [17][18][19][20][21][22] and inorganic ller/ organic matrix composite dielectrics. 10,[23][24][25][26][27] Among all the methods, the organic/inorganic composite dielectrics combining the high-3 r inorganic llers and a high-E b polymer matrix would take advantage of both components.…”