Poly(ether sulfone)s using a rigid dibenzothiophene dioxide heterocycle

Abstract

Poly(aryl ether)s were prepared by nucleophilic aromatic substitution using conformationally restricted dichloroand difluorodibenzothiophene dioxide heterocyclic monomers with bisphenol A or bisphenol AF. The heterocyclic monomers were prepared from the bis(4-halophenyl) sulfones in two steps via lithiation followed by copper catalyzed intramolecular coupling and characterized by 1 H, 13 C, 19F NMR spectroscopy and GC/MS. Reactivity of the fluorine containing monomer was examined using semi-empirical methods and NMR spectroscopy measurements and found to be potentially more reactive than bis(4-fluorophenyl) sulfone, even with a conformationally locked sulfone as the electron withdrawing group. Successful polymerizations of both the fluorine and chlorine containing monomers with bisphenol A and bisphenol AF nucleophiles were accomplished, providing polymers with number average molecular weights of approximately 45 kg/mol (difluoro monomer) and 10-20 kg/mol (dichloro monomer). The polymers exhibited high T g s ranging from 238 to 256 8C and displayed good thermal stability with 5% degradation temperatures in air from 453-510 8C, depending on molecular weight and bisphenol composition.

Selective Oxidation of Polysulfide Latexes to Produce Polysulfoxide and Polysulfone in a Waterborne Environment

“…Sulfur-containing polymers are a class of high-performance materials and have been instrumental in the development of specialty applications. While polysulfide (PSR) can be prepared directly from polycondensation, , the direct synthesis of polysulfoxide (PSO) and polysulfone (PSO2) is challenging. , However, the polymers containing sulfur centers with higher oxidation states, polysulfoxide (PSO) and polysulfone (PSO2), display desirable properties, such as thermomechanical and chemical stability. , Other polymers such as those containing phosphorous are also good examples of how the oxidation state of the main chain heteroatom can influence the properties of the polymer …”

Copolymers of poly(aryl ether ketone)/poly(ether ether amide) containing different numbers of methylene in the main chain: Synthesis and properties

“…The mechanical strength P1 was slightly higher than that of other polymers, which can probably be due to the higher chain stiffness of P1. Moreover, the mechanical strength of these polymers P2-P4 were higher than that of PA6T-Dupont (the tensile strength was about 50.9 MPa), 24 close to that of PA9T. 23 The result showed that the copolymers had good mechanical property.…”

“…into the molecular chain of poly (ether nitrile) (PEN) can improve the solubility, and at the same time can endow it new properties, such as fluorescence properties, 22 antifouling property, 21 and so forth. By introducing hydroquinone, 23 bisphenol A, 24 phenolphthalin, 25 and so forth. into the chain of poly (ether sulfone), the obtained polymer not only has good solubility but also reduces the cost.…”