Synthesis and Properties of Polyimide Silica Nanocomposite Film with High Transparent and Radiation Resistance

Abstract

In order to prepare flexible glass cover sheet materials suitable for space solar cells, fluorinated diamine 2,2’-bistrifluoromethyl benzidine (TFDB) and fluorinated dianhydride 4,4’ (hexafluoroisopropyl) diphthalic dianhydride (6FDA) as the monomer, polyimide (PI)/SiO2 composite film was synthesized by in situ polymerization, and the influence of coupling agent and SiO2 nanoparticle content on the film structure and properties was studied. The results show that PI synthesized from fluorine-containing monomers has better light transmittance, and the highest transmittance can reach 91.4%. The average visible light transmittance of the composite film decreases with the increase of SiO2 content, and the transmittance of the film decreases less in the high-wavelength region and greatly decreases in the low-wavelength region. The tensile strength and elastic modulus of PI/SiO2 composite film increase with the increase of SiO2 content, first increase and then decrease, reaching the maximum when the content is 10%; while the elongation at break of the composite film gradually increases with the increase of SiO2 content reduce. The thermal stability of PI/SiO2 composite film increases with the increase of SiO2 content. The doping of nano-SiO2 significantly suppresses the influence of irradiation on the mechanical properties of the film.

The Effect of Silane Coupling Agent on the Texture and Properties of In Situ Synthesized PI/SiO2 Nanocomposite Film

“…Solutions with 1%, 3%, 6% and 10% KH-560 was added into the above mixed solution and treated by ultrasonic for 2 h. Then, the dried diamine was added into the above solution and stirred until a transparent solution was formed. Subsequently, the dried dianhydride was added into the beaker under a nitrogen atmosphere and kept at 0 • C. When the added amount of dianhydride reached the equivalent point, the whole viscosity of the mixed solution abruptly improved, and the phenomenon of Rod Climbling occurred [18]. In order to facilitate laying the film, DMAc can be properly added to control the solid content at ~10%.…”

“…The advantage of the in situ polymerization approach is that the size and shape of SiO 2 can be controlled. The disadvantage is that the free energy of the nanoparticle interface is relatively large, the interaction between the particles is strong, and agglomeration is prone to occur during the polymerization reaction [15][16][17][18][19][20].…”

Structural, optical, dielectric, and surface properties of polyimide hybrid nanocomposites films embedded mesoporous silica nanoparticles synthesized from rice husk ash for optoelectronic applications

“…In addition, the addition of silica nanoparticles affected some optical parameters, which significantly contributed to decreasing the band gap (E g ), transmittance, and transparency of prepared films, and increasing refractive index and dielectric constant. Those optical quantities exhibited high values due to the formation of the nanostructured composites, which improved the UV-Vis absorption, optical conductivity, optical transmittance, and reflectance and enhanced the surface properties of films posteriorly offering a wide range of applications (Huang et al 2021).…”

Enhancement of Ultraviolet Light Resistance of Colorless and Transparent Semi-Alicyclic Polyimide Nanocomposite Films via the Incorporation of Hindered Amine Light Stabilizers for Potential Applications in Flexible Optoelectronics

“…In many practical applications, CPI films have to be 1qconfronted with the long-term ultraviolet-visible (UV) light exposure, such as the fluorinated CPI thermal control films for the space aircrafts have to endure the large doses of ultraviolet (UV) and vacuum ultraviolet (VUV) irradiation during the servicing life, and the CPI substrates for flexible photovoltaic solar cells will be irradiated by sunlight in the whole life. Generally speaking, due to the intrinsic organic molecular chain composition and the covalent bond structural features, the molecular chains and chemical bonds in organic polymers might be broke after long-term irradiation of UV and visible lights, especially the high-energy UV-A (320–400 nm), UV-B (320–400 nm), and UV-C (100–280 nm) exposure [ 4 , 5 , 6 , 7 , 8 , 9 ]. The great deterioration in the optical, mechanical, and dielectric properties of the polymers might be caused.…”