Flexible Polyimide Aerogels with Dodecane Links in the Backbone Structure

Abstract

Polyimide aerogels using 1,12-dodecyldiamine (DADD), 3,3′-dimethylbenzidine (DMBZ), and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and cross linked using 1,3,5-triaminophenoxybenzene (TAB) were synthesized. Substitution of the aromatic diamine, DMBZ, with varying amounts of the aliphatic diamine, DADD, increases the flexibility in the backbone structure of the prepared aerogel. These aerogels are also lightweight, low density, have a low dielectric constant, and high modulus. Their overall properties (density, shrinkage, porosity, dielectric constant, water uptake, and modulus) and potential use as a conformal substrate for lightweight, high-performance antennas are discussed.

Novel, flexible, and transparent thin film polyimide aerogels with enhanced thermal insulation and high service temperature

“…As can be seen in Fig. 3, the aerogels fabricated in this study are yellow in appearance similar to BTC cross-linked PPDA-PMDA, 61 BTC cross-linked PPDA-ODA-BPDA, 61 TAB cross-linked ODA-1,3diaminopropa-BPDA, 62 TAB cross-linked DADD-DMBZ-BPDA 16 and PSMA/PMN cross-linked ODA-DMBZ-BPDA aerogels. 63 However, looking closely at the aerogels' appearances, the backbone has an influential effect on color.…”

“…15 Another type of aliphatic diamine known as 1,12-dodecyldiamine (DADD) was used combined with 3,3 0 -dimethylbenzidine (DMBZ) in the synthesis of PI aerogels with enhanced flexibility. 16 The thick PI aerogel films made in this study were reported with the ability to be rolled without breaking.…”

“…Although silica aerogels have excellent thermal insulation performances with reported thermal conductivities even lower than air, they typically suffer from low mechanical performance and brittleness, which hinders their use in practical applications. 12,13 Organic-based aerogels, such as polyimide (PI), [14][15][16][17][18] polyamide, 19,20 and polyurethane (PU), 21,22 can be promising alternatives, as they exhibit more ductility and flexibility. In this context, PI aerogels with the thermal stability of up to 400 1C 14,23,24 are the only promising candidate for high service temperature.…”

Constructing Polyimide Aerogels with Carboxyl for CO2 Adsorption

“…Moisture-resistant polyimide aerogels containing propylene oxide links were reportedin the backbone by Meador [ 34 ]. Guo [ 35 ] researched flexible polyimide aerogels with dodecane links. Wang [ 36 ] synthesized polyimide aerogels containing benzimidazole structures for oil–water separation.…”

Ultralow Dielectric Constant Polyarylene Ether Nitrile/Polyhedral Oligomeric Silsesquioxanes Foams with High Thermal Stabilities and Excellent Mechanical Properties Prepared by Supercritical CO2

“…Therefore, high-performance dielectric materials have become the focus of the industry and aroused tremendous research enthusiasm. [1][2][3] Reducing the dielectric constant (k) has become one of the hot topics in current scientific exploration. [4] This is mainly because the lower k can effectively improve the propagation rate and significantly slow down the attenuation of the 5 G high-frequency millimeter wave due to the weak diffraction ability during the propagation process.…”