Synthesis and characterization of new soluble aromatic polyimides from diaminotetraphenylimidazolinone and aromatic tetracarboxylic dianhydrides

Abstract

A series of new soluble aromatic polyimides with inherent viscosities of 0.65-1.12 dL/g were synthesized from 1,3-bis(4-aminophenyl)-4,5-diphenylimidazolin-2-one and various aromatic tetracarboxylic dianhydrides by the conventional twostep procedure that included ring-opening polyaddition and subsequent thermal cyclodehydration. These polyimides could also be prepared by the one-pot procedure in homogeneous m-cresol solution. Most of the tetraphenyl-pendant polyimides were soluble in organic solvents such as N,N-dimethylacetamide, 1,3-dimethyl-2-imidazolidone, and m-cresol. Some polyimides gave transparent, flexible, and tough films with good tensile properties. The glass transition temperatures and 10% weight loss temperatures under nitrogen of the polyimides were in the range of 287-326 and 520-580ЊC, respectively.

Molecular Barbed Wire: Threading and Interlocking for the Mechanical Reinforcement of Polymers

“…Studies show that the mechanical properties still follow the stiffness/ductility tradeoff [14][15][16][17] and even sometimes sacrifice both. [18] One particular structure that has been gaining interest is triptycene (T), [19][20][21][22][23][24][25] which is characterized by its rigid, shape-persistent geometry.…”

Synthesis and characterization of soluble poly(amide‐imide)s bearing triethylamine sulfonate groups as gas dehumidification membrane material

“…Considerable efforts have been made to modify their chemical structure to improve their processability and solubility, and to change their properties with regard to a specific application or to a particular property. The introduction of bulky substituents7–17 or bulky pendant groups18–22 into rigid polymer backbones has been a general approach to increase solubility and processability of PAIs without sacrifying thermostability 23–25. It has been shown that the sulfonation of polymers is an effective method to increase both the permeation coefficient of water vapor and the separation factor of water vapor over inert gases 6…”

Optically Transparency and Light Color of Novel Highly Organosoluble Alicyclic Polyimides with 4‐tert‐Butylcyclohexyl Group

“…[2] Considerable amount of work has been centered on improving their processability and solubility through the synthesis of new diamine or dianhydride monomer. [3][4][5][6][7][8][9][10][11][12] The incorporation of bulky pendent groups [3][4][5][6][7][8][9][10][11][12] into rigid polymer backbones had been found successful.…”