Synthesis of aramid elastomers

Several methods for the synthesis of type I aramid elastomers have been proposed (i) transesterification reaction between the aramid compound I and PTMG (Route A) [33-35], (ii) polycondensation between PTMG end-capped 

The reactions in the bulk of PTMG and 4-aminoethylbenzoate with transesterification catalysts at ca. 180°C lead to an NH2 group-terminated PTMG, which yielded type I aramid elastomers by reacting with terephthaloyl chloride [56]. 

Kraft synthesized type I aramid elastomers by a novel route, a Pd(0) catalyzed carbonylation of amino group-terminated telechelic PTMO and aromatic 

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