Interfacial polycondensation, block copolymers

Interfacial polycondensation between a diacid chloride and hexamethylenediamine in the presence of small amounts of ACPC also yield polymeric azoamid, which is a macroazo initiator.[27] In this manner, azodicarbox-ylate-functional polystyrene [28], macroazonitriles from 4,4 -azobis(4-cyano-n-pentanoyl) with diisocyanate of polyalkylene oxide [29], polymeric azo initiators with pendent azo groups [3] and polybutadiene macroazoinitiator [30] are macroazoinitiators that prepare block and graft copolymers. 

In addition to a block copolymer, a microcapsule was made from suspension interfacial polycondensation between diacid chloride having aromatic-aliphatic azo group and aliphatic triamine [70,71]. The capsule was covered with a crosslinked structure having an azo group that was thermally stable but sensitive to light so as to be applicable to color photoprinting materials. 

Simple melt blending reactions can also be applied to preparations of block copolyamides, similarly to the process for polyesters, th time, total equilibrium conditions also are gradually achieved in the melt. Interfacial polycondensation is also useful in preparation of block copolymers. When mixed diacid chlorides and/or mixed diamines are reacted, the more active diacid chlorides and/or diamines react preferentially and blocks form. In addition, it is possible to carry out the growth of one of the segments first, to a fairly large size, and follow it by addition of the other comonomers. ... 

Frere et al. have reported the synthesis and characterization of PU microcapsules containing water, by interfacial polycondensation using three different diols, viz. 1,5- pentane diol, poly(ethylene glycol)s (PEG 600, PEG 1500, PEG 4200), and two different isocyanates, viz. diphenyl methylene diisocyanate (MDl) and poly(hexa-methylene diisocyanate) [25]. The surfactant used is ABA block copolymer from... 

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