4/-Dichloro-diphenylsulfone

This monomer can be used with 4 -dichloro-diphenylsulfone and 3,3 -disulfonate-4,4 -dichloro-diphenyl sulfone for the synthesis of membranes for... 

Trimers, tetramers, pentamers, hexamers, and up to decamers are observed. B chains are expected, whereas B chains are unexpected. MS peaks due to B chains are, most probably, produced by the reaction of chlorine-ended copolymer chains with 4hydroxy, 4 chloro diphe-nylsulfone, HO-( )- SO2 -( )-C1, present as an impurity in commercial 4,4 dichloro diphenylsulfone. 

The McGrath group [159-171] extensively studied the use of sulfonated 4,4 -dichlorodiphenylsulfone in combination with various bisphenols, such as bisphenol A, bisphenol 6F, hydroquinone, biphenol, and 4,4 -dichloro-diphenylsulfone, for the preparation of ion-exchange materials. The main results of this work were recently pubUshed in a review [170]. In general, the... 

Monochlorobenzene. The largest use for monochlorobenzene, accounting for about 40 percent of the consumption, is in the production of chloronitrobenzenes. p-Nitro-chlorobenzene (NCR) is converted into p-phenylenediamines for use as antioxidants in rubber processing. A smaller use for NCR is in the synthesis the pain reliever acetaminophen. ort/io-Nitrochlorobenzene is a raw material for producing insecticides and several azo pigments. A large number of dyes also can be derived from either chlorobenzene or nitro-chlorobenzene. About 25 percent of the monochlorobenzene is used as a solvent for pesticide formulation and in MDI processing. The manufacture of diphenyl oxide, for heat transfer fluids, and phenylphenols, for disinfectants, consumes another 22 percent. About 8 percent is used to make dichloro-diphenylsulfone, an intermediate in the manufacture of sulfone polymers. 

The synthesis of the poly-(o-chlorophenyl)-imides was accomplished in two steps involving low-temperature reaction between the diamines and bis(phthalic anhydrides) in NMP followed by catalytic imidisation of the PCA directly in the reaction solutions using the catalytic complex pyridine acetic anhydride. The synthesis of polyimides from l,l-dichloro-2,2-di-(3-amino-4-aminophenyl)-ethylene proceeded homogeneously throughout the course of the reaction, as did reactions of 3,3 -diamino-4,4 -dichlorobenzophenone with the dianhydride of diphenyloxide-3,3, 4,4 -tetracarboxylic acid. As to reactions of 3,3 -diamino-4,4 -dichlorobenzophenone with the dianhydrides of pyromellitic and diphenylsulfone-3,3, 4,4 -tetracarboxylic acids, these were homogeneous at the PCA formation step but heterogeneous at the polyimide formation step. Some properties of these polyimides are given in Tables 3.3 and 3.4. 

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