Fluorinated hb-poly

Satpathi et al. [78] synthesized an AB2 monomer containing pendant -CF3 groups, namely bis-(4-fluoro-3-trifluoromethylphenyl)-4 -hydroxy-phenylphosphine oxide, which was self-condensed to afford fluorinated hb-poly(arylene ether phosphine oxide) (F-hb-PAEPO) (Scheme 2.19). A high molar mass of M 6,16,000 g/mol was achieved with D = 1.4. The F-hb-PAEPO was completely soluble in a wide range of organic solvents, namely CHCI3, CH2CI2, THF, NMP, DMF, DMSO, DMAc, and acetone at room temperature. 

Scheme 2.17 Synthesis of hb poly(arylene ether)s from monomers containing nitro group (a) via selective and sequential S vjAr (preferential fluorine displacement followed by nitro displacement) reaction of As-and BC-type monomers (b) via nitro displacement reaction of A2C-type monomer. Taken from Ref. [76],...

The authors also investigated unusual growth of hb poly(arylene ether)s using l,l,l-tris(4-hydroxyphenyl ethane as As-type and 5-fluoro-2-nitrobenzotrifluoride as BC-type monomer by one-pot synthesis with stepwise fluorine displacement followed by nitro displacement [75]. 

Fig. 3 DSC plots of fluorinated hb copoly(aryl ether)s (2a-c and 3a-c see Scheme 15 for structures) and fluorinated hb homopoly(aryl ether)s, where hhp(lw) signifies hb poly(aryl ether) of low molecular weight and hbp (hw) signifies hb poly(aryl ether) of high molecular weight. Reproduced with permission from [197]...

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