Polyamides silylated diamines

The utilization of N-silylated diamines as polyamide and polyimide forming monomers has recently been exhaustively reported by Kakimoto et al. [105] and Oishi et al. [106]. But their work is beyond the scope of this... 

It is also possible to prepare them from amino acids by the self-condensation reaction (3.12). The PAs (AABB) can be prepared from diamines and diacids by hydrolytic polymerization [see (3.12)]. The polyamides can also be prepared from other starting materials, such as esters, acid chlorides, isocyanates, silylated amines, and nitrils. The reactive acid chlorides are employed in the synthesis of wholly aromatic polyamides, such as poly(p-phenyleneterephthalamide) in (3.4). The molecular weight distribution (Mw/Mn) of these polymers follows the classical theory of molecular weight distribution and is nearly always in the region of 2. In some cases, such as PA-6,6, chain branching can take place and then the Mw/Mn ratio is higher. 

With aromatic diamines having low reactivity, it has proved difficult to produce polyamides of high molecular weight. However they can be considerably activated by conversion to their N-silylated derivatives. Using this method, for example, high molecular weight polyamides have been obtained from WJV -diphenylanilirK and tetrafluoro-m-phenylenediamine ( heme 10). 

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