Synthesis And Investigation Of Properties Of Poly(Arylene Ether Nitriles) With Pendant Functional Groups

As a special engineering plastics, poly(arylene ether nitriles)(PEN) has excellentperformances and can be used over150oC for long-term. At present it is mainly used forhigh technology, national defense military, aerospace and other industrial fields. In thispaper, series of PEN with pendant active groups were prepared. Structures andproperties of PENs were studied. In addition, some functional groups were introducedto the polymers as pendant groups. the performance of functional polymers wereinvestigated, including fluorescence and dielectric propertis.1. Three kinds of Poly(artlene ether nitriles)(PEN) with different carboxyl groupswere synthesized via nucleophilic aromatic substitution from2,6-dichlorobenzonitrile(DCBN), phenolphthalin (PPL) and bisphenol A (BpA). The first of PEN wassynthesized from DCBN and BpA named PEN-1, the second was synthesized fromDCBN, ratio of equimolar BpA and PPL, which named PEN-2, the third wassynthesized from DCBN and PPL, named PEN-3. All of the PENs were measured byFourier Transform Infrared (FTIR), and the intrinsic viscosity, molecular weight,solubility were tested. In addition, the films of PENs were characterized by DSC, TGAand tensile test. The results showed excellent tensile properties and thermostability.2. Preparation of poly(arylene ether nitriles) with pendant phthalonitrilegroups(PEN-CN), which obtained via the Yamazaki-Higashi phosphorylation route of4-(4-aminophenoxy)-phthalonitrile (APN) with PEN-2in the presence of CaCl2. Thechemical structure and molecular weight of PEN-CN were characterized by1H-NMR,FTIR, and Gel permeation chromatography (GPC). Meanwhile, the effects of differentaromatic amines and Lewis acid on the crosslinking behavior of PEN-CN were studiedby DSC. The results indicated that anhydrous zinc chloride (ZnCl2) was the best catalystto lower the curing temperature among other catalysts.3. Based on the PEN-CN, Poly(arylene ether nitriles)-Copper phthalocyanineconjugates complex (PEN-CuPc) was prepared via in situ polymerization from(PEN-CN) and excessive4-nitrophthalonitrile. The fluorescence and dielectricproperties were investigated. 4. Poly(arylene ether nitriles)/copper phthalocyanine (PEN/CuPc) functionalnanohybrid films with high dielectric permittivity (140at100Hz) were prepared by asolution-casting method. These films can be employed with giant dielectric permittivitycopper tetra-amine phthalocyanines as a functional organic filler and acid-containedpoly(arylene ether nitriles) as a polymer matrix. Dielectric properties of the PEN/CuPcshowed that the nanohybrid films exhibited significant increase in dielectric permittivityby adding CuPc in polymer resin. Meanwhile, dielectric loss of the films was drasticallydecreased after heat treated at high temperature and the dielectric dispersion of the filmsbecame smaller.