Synthesis And Properties Of Poly(aryl Ether Ketone)s Containing Biphenyl Units And Pendant Cyano Groups And Aromatic Polyamides Containing 2,6-Diphenypyridine Moieties

This dissertation consists of two parts: In the first part, we investigated the synthesis and properties of poly(aryl ether ketone)s containing biphenyl units and pendant cyano groups. In the second part, we prepared aromatic polyamides containing2,6-diphenylpyridine moieties by the polycondensation of aromatic diacid dichlorides with aromatic diamines containing pyridine structure.1. A series of poly(aryl ether ketone)s containing biphenyl units and pendant cyano groups were prepared by the Friedel-Crafts acylation copolycondensation of isophthaloyl chloride(IPC) with a mixture of 4,4’-bis(4-phenoxybenzoyl)diphenyl(BPOBDP) and2,6-diphenoxybenzonitrile(DPOBN), over a wide range of BPOBDP/DPOBN molar ratios, in the presence of anhydrous Al Cl3 and NMP in 1,2-dichloroethane(DCE). The resulting copolymers were characterized by different physico-chemical techniques such as FT-IR, DSC, WXRD and TGA. The results showed that the copolymers had high glass transition temperatures and moderate melting temperatures when BPOBDP/DPOBN molar ratio was in range of from 50/50 to 40/60. The copolymers obtained exhibited high thermal stability and good resistance to organic solvents.2. Several aromatic diamines containing pyridine structure were prepared by the condensation reaction of aromatic aldehydes with 4-nitroacetophenone in the presence of NH4 OAc in Ac OH, followed by reduction with hydrazine hydrate in ethanol. A series of aromatic polyamides containing 2,6-diphenylpyridine units were synthesized by the polycondensation of aromatic diamines containing pyridine structure with various aromatic diacid dichlorides in DMAc. The polymers were characterized by different physico-chemical techniques such as FT-IR, DSC, WXRD and TGA. The results showedthat the polymers had high glass transition temperatures(Tg > 400℃) and exhibited high thermal stability. The polymers were soluble in strong polar aprotic solvents such as NMP, DMAc, DMSO, DMF and pyridine, and could form strong, transparent, and flexible films.