Poly arylene etherjs

The SnAt reactions were first successfully used in the synthesis of high-molecular-weight poly(arylene etherjs by Johnson et al.4,5 This reaction represents a good example for poly(ether sulfonejs in general, either in laboratory -or industrial-scale preparations. In this procedure, the bisphenol A and sodium hydroxide with an exact mole ratio of 1 2 were dissolved into dimethyl sulfoxide (DMSO)-chlorobenzene. The bisphenol A was converted into disodium bisphenolate A, and water was removed by azeotropic distillation. After the formation of the anhydrous disodium bisphenolate A, an equal molar amount of 4,4,-dichlorodiphenyl sulfone (DCDPS) was added in chlorobenzene under anhydrous conditions and the temperature was increased to 160°C for over 1 h... 

Other coupling reactions were also employed to prepare poly(arylene etherjs. Polymerization of bis(aryloxy) monomers was demonstrated to occur in the presence of an Fe(III) chloride catalyst via a cation radical mechanism (Scholl reaction).134 This reaction also involves carbon-carbon bond formation and has been used to prepare soluble poly(ether sulfone)s, poly(ether ketone)s, and aromatic polyethers. 

Miyatake, K. and Hay, A. S. 2001. New poly(arylene etherjs with pendant phosphonic acid groups. Journal of Polymer Science Part A 39 3770-3779. 

Since 1985, a major effort has been devoted to incorporating heterocyclic units within the backbone of poly(arylene etherjs (PAE). Heterocyclic units within PAE generally improve certain properties such as strength, modulus and the glass transition temperature. Nucleophilic and electrophilic aromatic substitution have been successfully used to prepare a variety of PAE containing heteorcyclic units. Many different heterocyclic families have been incorporated within PAE The synthetic approaches and the chemistry, mechanical and physical properties of PAE containing different families of heterocyclic units are discussed. Emphasis is placed on the effect variations in chemical structure (composition) have upon polymer properties. 

Urea linkages have been monitored during the extrusion production of a polyurethane-urea, through doping with a fluorescent aromatic diamine chain extender, whereas soluble poly(arylene etherjs, thioethers and sulfones have been synthesized which emit strongly in blue and red regions. Brownian dynamics have been used to determine the distribution of fluorescent resonance... 

Xie, D., Ji, Q., and Gibson, H. W., Synthesis and Ring-Opening Polymerization of Single-Sized Aromatic Macrocydes for Poly(arylene etherjs, Macromolecules, 30, 4814, 1997. 

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