Mechanism interfacial acid-base function

The polyamide and the polyether segments are usually incompatible, phase separation often occurs and the reaction between the reactive chain-ends can only take place at the interface. This reaction can be accelerated by using very reactive functional groups, such as acid halides. The synthesis of polyamides and polyesters via interfacial polymerization has been extensively reviewed by P. W. Morgan [43] in the mid-sixties. A few years later, Castaldo et al. [44] successfully synthesized a poly(ether ester amide) based on PA6.6 and PEO. The a,oj-dihydroxy polyether was first reacted with a diacid chloride for several hours, either in the bulk or in chloroform, and at a rather low temperature (60-90°C). The mixture was then poured into a vigorously stirred aqueous solution of diamine and sodium hydroxide. Later, de Candia et al. [45] reproduced this technique to study the physical and mechanical properties of the copolymer. The same polymerization technique was also used to prepare copolymers based on PPO as the polyether segment and PA6.10 as the polyamide block [3,46,47]. 

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