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21.15.3.1.3.3 Melt or Solid-State Polymerization

DOI: 10.1055/sos-SD-121-00001

Higashihara, T.; Ueda, M.Science of Synthesis Knowledge Updates, (20104310.

Reaction-induced crystallization is a very important method and is based upon a concept of the atom-economical, direct polymerization of diacids and diamines. However, it requires specific nonvolatile solvents that should be removed, after polymerization, by re­precipitation and/or a thorough washing process. Therefore, melt or solid-state polymerization of diacids and diamines, without any additives or solvents, has been developed for the synthesis of aromatic polyamides.[‌31‌] Diacids and diamines containing ether linkages are employed, with the expectation that they should increase the mobility of polymer chains, and decrease the glass-transition (Tg) and melting (Tm) temperatures of the resulting polyamides. However, in order to suppress the sublimation and/or decomposition of monomers in the heating process, careful temperature control is required (Table 1).

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