基于1,2-二氢-2-(4-羧基苯基-4-[4-(4-羧基苯氧基)-3-甲基苯基](2H)二氮杂萘-1-酮的新型芳香聚酰胺的简易合成

A new monomer diacid, 1,2-dihydro-2-(4-carboxylphenyl)-4-[4-(4-carboxylphenoxy)-3-methylphenyl]phtha-lazin-1-one (3), was synthesized through the aromatic nucleophilic substitution reaction of a readily available unsymmetrical phthalazinone 1 bisphenol-like with p-chlorobenzonitrile in the presence of potassium carbonate in N,N-dimethylacetamide and alkaline hydrolysis. The diacid could be directly polymerized with various aromatic diamines 4a-4e using triphenyl phosphite and pyridine as condensing agents to give five new aromatic poly(ether amide)s 5a-5e containing the kink non-coplanar heterocyclic units with inherent viscosities of 1.30-1.54 dL/g.The polymers were readily soluble in a variety of solvents such as N,N-dimethylformamide (DMF), N,N-dimethyl-acetamide (DMA), dimethylsulfoxide (DMSO), N-methyl-2-pyrrolidinone (NMP), and even in m-cresol and pyridine (Py). The transparent, flexible and tough films could be formed by solution casting. The glass transition tem-peratures Tg were in the range of 286-317℃.

Facile Synthesis of New Aromatic Polyamides Based on 1,2‐Dihydro‐2‐(4‐carboxylphenyl)‐4‐[4‐(4‐carboxylphenoxy)‐3‐methylphenyl]phthalazin‐1‐one

A new monomer diacid, 1,2‐dihydro‐2‐(4‐carboxylphenyl)‐4‐[4‐(4‐carboxylphenoxy)‐3‐methylphenyl]phthalazin‐1‐one ( 3 ), was synthesized through the aromatic nucleophilic substitution reaction of a readily available unsymmetrical phthalazinone 1 bisphenol‐like with p‐chlorobenzonitrile in the presence of potassium carbonate in N,N‐dimethylacetamide and alkaline hydrolysis. The diacid could be directly polymerized with various aromatic diamines 4a–4e using triphenyl phosphite and pyridine as condensing agents to give five new aromatic poly(ether amide)s 5a–5e containing the kink non‐coplanar heterocyclic units with inherent viscosities of 1.30–1.54 dL/g. The polymers were readily soluble in a variety of solvents such as N,N‐dimethylformamide (DMF), N,N‐dimethylacetamide (DMA), dimethylsulfoxide (DMSO), N‐methyl‐2‐pyrrolidinone (NMP), and even in m‐cresol and pyridine (Py). The transparent, flexible and tough films could be formed by solution casting. The glass transition temperatures T_g were in the range of 286–317 °C.