Synthesis and characterization of new aromatic polyesters with a (4-phenoxyphenyl)phenylmethene linkage

Abstract

A series of new aromatic polyesters containing a (4-phenoxyphenyl)phenylmethene linkage were prepared by phase transfer-catalyzed interfacial polycondensation of 1,1-bis(4-hydroxyphenyl)-1-(4-phenoxyphenyl)-1-phenylmethane with terephthaloyl chloride, isophthaloyl chloride, and so on. The inherent viscosities of the polyesters ranged from 0.62 to 0.90 dL/g, while number-average molecular weights were in the range of 30,500–35,500 g/mol. All the polyarylates were readily soluble in organic solvents such as dichloromethane, chloroform (CDCl3), tetrahydrofuran, meta-cresol, pyridine, N, N-dimethylformamide, N, N-dimethylacetamide, and 1-methyl-2-pyrrolidinone at room temperature, and could be cast into tough, transparent, and flexible films from their CDCl3 solutions. Wide-angle X-ray diffraction measurements revealed the amorphous nature of the polyarylates. These polymers showed glass transition temperatures ( Tgs) between 178°C and 240°C and decomposition temperatures at 10% weight loss ranging from 446°C to 483°C, while the initial degradation temperatures in the range of 410–435°C under nitrogen atmosphere. These new polyarylates exhibited higher Tgs and better solubility than bisphenol A-based analogues.

Novel organosoluble polyarylates based on diphenylamine-fluorene units

“…The polyarylates have been widely applied in automobile, aviation, and electronic industries because of their high optical transparency, excellent mechanical properties, and high thermal stability. [1][2][3][4][5] However, the poor solubility and high glass transition temperatures (T g s) of the polyarylates limited their practical applications. To overcome these difficulties, some attempts have been made to modify the structure of polyarylates including appending bulky substituents, introducing flexible groups in the polymer chain, and inserting cardo moieties.…”

Superhydrophilic fluorinated polyarylate membranesvia in situphotocopolymerization and microphase separation for efficient separation of oil-in-water emulsion

“…22 Polyarylate, a family of high-performance polymers, noted for their strength, toughness, chemical resistance, and high melting points. [23][24][25][26] Recently, Livingston and co-workers have demonstrated the formation of crosslinked polyarylate microporous membranes which have great potential for applications in molecular separations. 27 In previous studies, our group developed a simple procedure to fabricate a superhydrophobic and superoleophilic porous polyarylate membrane which could effectively separate oil/water mixtures.…”