Synthesis and characterization of fluorine and nitrile containing polyimides

Abstract

A series of polyimides were synthesized from new diamine, Bis [4,4Ј-amino-5,5Ј trifluoromethyl phenoxy-(hexafluoro isopropylidine) phenoxy phenyl] benzonitrile [BATFB] and various aromatic tetracarboxylic anhydrides by thermal and chemical imidization routes. The BATFB was synthesized in two steps by nucleophilic displacement reaction of 2,6-dichloro benzonitrile, 4,4Ј-(hexafluoro isopropylidine) diphenol and 2-amino-5-fluoro benzotrifluoride in the presence of anhydrous potassium carbonate in N,NЈ-dimethyl acetamide (DMAc) and the structure was confirmed by FTIR spectroscopy and CHNSO analyzer. The polymers were characterized by FTIR spectroscopy and thermal analysis were performed by differential scanning calorimetry and thermogravimetric analysis methods. The prepared polyimides had glass transition temperatures between 230 and 290°C and their 10% weight loss were recorded in the range 550 -590°C in N 2 atmosphere. Majority of polymers are found to be soluble in most of the organic solvents such as DMSO, DMF, DMAc, m-cresol, and THF even at room temperature and few becomes soluble on heating. The prepared polyimides showed water uptake values 0.34 -0.54 wt % at room temperature.

Synthesis and properties of optically active nanostructured polymers bearing amino acid moieties by direct polycondensation of 4,4′-thiobis(2-tert-butyl-5-methylphenol) with chiral diacids

“…Due to these properties they have been extensively used in aerospace, microelectronic, aviation, defense and electronic packaging industries (Wilson et al 1990;Cassidy 1980;Mallakpour and Kowsari 2005;Guo et al 2007a;Faghihi and Gholizadeh 2010;Raju and Alam 2006). However, one of the problems with most polyimides is their poor processability, high dielectric constant, high glass transition and limited solubility in common organic solvents.…”

Studies on novel semi‐2‐IPNs from polyetherimide and citraconimide

“…Addition polyimides, such as 5‐norbornene‐2,3‐dicarboximide (nadimide), maleimide and ethynyl terminated imide resins are a leading class of thermosetting polyimides and have received attention because of their excellent thermal stability, good chemical resistance, good mechanical and electrical properties. 1–9 Since early1970's these resins have been extensively investigated as matrix resins for advance fiber reinforced composites, adhesives and in multilayer circuit boards in electronic industry. The drawback of these resins is their brittleness due to high crosslink density.…”