Structural, thermal and mechanical properties of polymer nanocomposites based on organosoluble polyimide with naphthyl pendent group and layered double hydroxide

Abstract

In this study, a soluble aromatic polyimide (PI) with naphthyl pendent group was initially synthesized by the reaction of pyromellitic dianhydride (PMDA) with 5-methyl- N,N-bis(4-nitrophenyl)naphthalen-1-amine. Then, via co-precipitation reaction of zinc nitrate hexahydrate and chromium nitrate nonahydrate, Zn/Cr-layered double hydroxide (LDH) was synthesized using hydrothermal techniques. Finally, different novel nanocomposites (NCs) based on PI and Zn/Cr-LDH (1, 2, 4 wt%) were produced through in situ polymerization. The resulting materials were characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, thermogravimetry analysis (TGA), field emission scanning electron microscopy, transmission electron microscopy, and mechanical testing. According to the TGA results, the prepared NCs showed high thermal stability at higher temperature due to the good dispersion and homogeneity of Zn/Cr-LDH in polymeric matrix. Consequently, the mechanical properties of the synthesized NCs were enhanced by the incorporation of 2 wt% Zn/Cr-LDH in the polymer matrix.

Studies on naphthalene and 1,2,3-triazole ring containing polyimides/zinc oxide nanocomposites

“…It is also expected that the efficient design of PIs and their nanocomposites will be highly critical in the delivery of excellent performance at reasonable cost. 31,32 In this study, we have demonstrated that diamine containing naphthalene and 1,2,3-triazole could be successfully synthesized, initiated with the click reaction, and used to prepare aromatic PI nanocomposites with ZnO. The transparency, thermal stability, and mechanical properties of these PI/ZnO nanocomposite films were addressed.…”

“…It is also expected that the efficient design of PIs and their nanocomposites will be highly critical in the delivery of excellent performance at reasonable cost. 31,32…”

Polyimide/fluorinated silica composite films with low dielectric constant and low water absorption

“…Generally, there are several ways to increase pores in the film: (1) Add unstable components to the polyimide matrix, and then decompose at high temperature to produce pores 16-18 ; (2) add pore-containing fillers to the polyimide matrix 7,19-23 ; (3) link bulky substituents on the side chain of polyimide or increase the free volume fraction by changing the tightness of polyimide molecular chains through branched cross-linking. [24][25][26][27] In addition, adding nanomaterials to the polyimide matrix can not only improve the mechanical properties and thermal properties [28][29][30][31][32] of the material, but also reduce the dielectric constant of the material. In summary, adding a filler containing a porous structure to the polyimide matrix for the purpose of reducing dielectric constant is the simplest and most commonly used method.…”

In situ suspension polymerization of vinyl chloride/3-(trimethoxysilyl) propyl methacrylate (MPTMS)-intercalated Mg-Al-hydroxide layered double hydroxide: I. Grain properties

“…6 Among nanofillers, the layered double hydroxides (LDHs) are one of the most specific inorganic fillers that have been used extensively in polymer nanocomposite preparation. [7][8][9][10][11][12][13] The growth of LDH nanocomposites has increased in recent years. LDHs have been reported to significantly improve the mechanical and thermal properties of the end-use polymer products.…”

“…6 Among nanofillers, the layered double hydroxides (LDHs) are one of the most specific inorganic fillers that have been used extensively in polymer nanocomposite preparation. 7–13…”