Synthesis of new diacid monomers and poly(amide-imide)s: study of structure–property relationship and applications

Abstract

Two diimide-diacid monomers 4,4′-bis[4″-(trimellitimido)phenyl isopropylidene-4″′-phenoxy]diphenyl sulfone and 4,4′-bis[4″-(trimellitimido)phenylisopropylidene-4″′-phenoxy] were synthesized. The structures of the monomers were characterized by FT-IR and 1 H-NMR spectroscopy. A series of novel poly(amide-imide)s were prepared from this two diacids and aromatic diamines through phosphorylation reaction. The PAIs were characterized by FT-IR, 1 H-NMR, XRD, TGA, and DSC, solution viscosity, solubility test and electrical properties. Poly(amide-imide)s showed excellent solubility due to the presence of flexible groups and isopropylidene unit in the polymer backbone. They also exhibited good thermal stability and the temperatures at which 10% weight loss occurred in the range 385-465°C. These PAIs found to have a dielectric constant in the range 3.25-4.20 at 10 kHz and have excellent electrical insulation character and can be used as insulation materials for electrical items operating at elevated temperatures.

The effect of surface modification of zeolite 4A on the physical and electrical properties of copolyimide hybrid films

“…Polyimides are divided into two main classes known as aliphatic [2] and aromatic. Aromatic polyimides are finding increased application in microelectronics since their high thermal stability, good chemical resistance and durability [3]. However, they have limited solubility in organic solvents as a result of a rigid polymer backbone.…”

“…The synthetic studies guided by the computational calculations in the literature revealed that polymers with high dielectric constants (>4) involve aromatic groups and structural functionalities: eNHe, eC(]O)e, or eO [12]. Upto now several works have been performed on polyimide with added Al 2 O 3 , BaTiO 3 and ZrO 3 which showed an improved dielectric constant [13e15]. The phosphine oxide based polyimides and their inorganic hybrids are the essential part of our studies because of their good solubility in solvents, mechanical strength, thermal stability and adhesive property [16].…”

Characterization of Thermally Stable AB-type Poly(ether-amide)s Derived from AB-type Monomers by Fluoro Displacement Reaction

“…Aromatic polyamides are well known for their high temperature stability, excellent mechanical strength and good chemical resistance that qualify them as highperformance polymeric materials [1][2][3][4][5][6][7] . However, the applications of aromatic polyamides are often limited due to infusibility and insolubility, which are caused by the high regularity, rigid polymer backbones and the formation of intermolecular hydrogen bonding.…”

Synthesis, characterization, and properties of novel diol monomers and processable thermally stable polyimides

“…Many significant synthetic efforts have been made to improve the processability without compromising on the thermal stability. The most efficient methods are (i) incorporation of flexible linkages in the polyimides chain, (ii) incorporation of kinks in the polyimides chain, (iii) incorporation of large nonpolar and polar pendant groups in the polyimides chain, and (iv) attachment of flexible side chain in the polyimides chain [9][10][11][12].…”