Preparation and properties of polymides, polyamides and poly(amide‐imide)s based on a spirobichroman dietheramine

Abstract

A novel diamine, 7,7'-bis(4-aminophenoxy)-4,4,4',4'-tetramethy1-2,2'-spirobichroman (3), was synthesized and used as a monomer with various aromatic tetracarboxylic dianhydrides, dicarboxylic acids and imide ring-containing dicarboxylic acids, to synthesize polyimides, polyamides and poly(amide-imide)s, respectively. The polyimides 5 a-f were prepared from diamine 3 and various aromatic tetracarboxylic dianhydrides via a conventional two-stage procedure. The intermediate poly(amic acid)s had inherent viscosities of 0,84-I ,65 dL/g and could be thermally converted into transparent, flexible, and tough polyimide films. Some polyimides were readily soluble in polar solvents such as N,N-dimethylacetamide (DMAc) and N-methyl-2-pyrrolidone (NMP). The glass transition temperatures (T,) of these polyimides were in the range of 155-280°C, and 10% weight loss temperatures were above 450°C in air or nitrogen. Furthermore, a series of pol yamides and poly(amide-imide)s having inherent viscosity between 0.40-1,69 dL/g were prepared by direct polycondensation of the diamine 3 with various aromatic dicarboxylic acids and imide ring-containing dicarboxylic acids. All the pol yamides and poly(amide-imide)s were soluble in a variety of organic solvents and could be solutioncast into flexible and tough films. They had Tg values in the 150-237°C range and showed no significant weight loss below 400 "C in air and nitrogen atmosphere.

Detection of chromosomal aneusomy by fluorescence in situ hybridization for patients with nipple discharge

“…Therefore, much research has been focused on the preparation of soluble or thermoplastic polyimides without the loss of their desirable properties 3, 4. Typical approaches include the incorporation of flexible linkages,5–7 bulky lateral or cardo groups,8–11 kinked or unsymmetrical structures,12–15 and spiro‐skeletons16–20 into the polymer backbone.…”

Synthesis and properties of organosoluble polyimide/clay hybrids

“…The polyimide employed, SBA‐6FDA, was derived from 4,4′‐hexafluoroisopropylidenediphthalic anhydride (6FDA) and a spiro‐linked diamine 7,7′‐bis(4‐aminophenoxy)‐4,4,4′,4′‐tetramethyl‐2,2′‐spirobichroman (SBA). It was soluble and thermoplastic as described in our previous publication 12. The hybrid materials may find good applications in the microelectronics industry.…”

Highly soluble and colorless fluorinated poly(ether imide)s based on 4,4’-(2,5-tolylenedioxy)diphthalic anhydride and trifluoro methyl-substituted aromatic bis(ether amine)s

“…The semidried PEI film was further heated to 200 C and held at that temperature for 2 h to remove the residual solvent. Inherent viscosity of IVa(C) was 1.1 dL/g, as measured at a concentration 0.5 g/dL in DMAc at 30 o C. 13 Measurements IR spectra were recorded on a Horiba FT-720 Fourier transform infrared (FTIR) spectrometer. 1 H and 13 C NMR spectra were measured on a Bruker AV-500 FT-NMR spectrometer.…”

“…Considerable research efforts have been focused on the synthesis of soluble polyimides that retain the attractive properties of this kind of polymers [3,4]. Typical approaches include the introduction of flexible linkages [5,6], bulky lateral groups [7][8][9], kinked or unsymmetrical units [10][11][12], and spiro-skeletons [13][14][15][16] into the polymer backbone. Another obstacle that may hinder extending the applications of aromatic polyimides in optoelectronic materials is the light or dark-yellow color of their films caused by the intramolecular and intermolecular charge transfer complex (CTC) between alternating electron-donor (diamine) and electron-acceptor (dianhydride) moieties [17].…”