PEO-PMAA

Reverse micelles from amphiphilic block copolymers have been widely investigated. In such micelles, the core is typically formed from PEO, PMAA,... 

The difference between a-helical structures and random coils plays an important role in the complexation occurring in the system PEO-PMAA-PGA. The distance between two carboxy groups, which are fixed on the a-helical structure of PGA, does not match with the distance between two ether oxygen atoms of PEO. Thus, PEO interacts preferentially with the carboxy groups of PMAA existing in a random structure. 

The results of the substitution reaction of the integral-type polycation (2X)-PEO-PMAA system are shown in Fig. 44. The PEO-PMAA complex and the 2X-PMAA complex are preferably formed in the low or high pH region, respectively, whereas in the intermediate pH region the 2X-PEO-PMAA ternary complex is formed, but the yield of its precipitate is very low. Thus, in the 2X-PEO-PMAA system, a substitution reaction takes place due to the process described by Eq. (68). The decrease in the yield of the precipitate of the ternary complex is well explained by the following scheme ... 

A large number of macromolecules complementary to PMAA, namely polyvinylpyrrolidone, polyvinylpyridine, polyacrylamide, poly(vinyl alcohol), poly(ethylene oxide), oligoethylenimine, poly(sodium styrene sulfonate), polycations of the integral type ionen (2X) were used as P2 and P3. The pH of the media strongly influences the studied reactions of complex formation. For example, in PVPy + PVP + PMAA or OEI + PEO + PMAA systems in the add region, where weak polybases are completely protonized and PMAA does practically not dissodate, complexes with hydrogen bonds (PMAA-PVP or PMAA-PEO) are formed. In neutral medium weak polybases are partially ionizated and polyelectrolyte complexes (PMAA-PVPy, PMAA-OEI) are generated. In the alkaline medium formation of complexes has not been observed. 

The development of CaCOs tablet-like arrays was achieved at the air/water interface through the cooperative mineralization regulated by a polypeptide and a DHBC, namely PEO-PMAA [95]. The experimental data indicate that the role of the block copolymer is focused on the regulation of the arrangement and orientation of the CaCOs tablets. The cooperative action of a polypeptide is essential for the formation of CaCOs tablet at the air/water interface. In the absence of the polypeptide, the formation of calcite CaCOs particles in the water phase was observed. 

Systematic studies on photo-cross-linking block copolymer micelles, with a core of poly(cinnamoylethyl methacrylate) (PCEMA) were published by Liu and co-workers [229]. With PAA as the shell-forming block, these authors could demonstrate by SLS, DLS, TEM and SEC that photo-cross-linking of PCEMA locked in the initial structure of the micelles without any significant change in their aggregation number and size distribution. Corecross-linking of PEO-PMAA micellar systems with Ca ions has recently been described by Kabanov and co-workers [230]. 

The complex formation by polymer-surfactant interaction has been extensively studied, as well for ionic and non-ionic polymers as for the different surfactant types, for example anionic, cationic and non-ionic low molecular weight surfactants. The driving forces for these complex formations are in general electrostatic or hydrophobic-hydrophobic interactions between polymer and siufactant. These concepts have been extended to block copolymer systems mainly to those containing a water-soluble PEO block, such as PPO-PEO, PS-PEO, PEO-PMAA, PMMA-PEO in the presence of anionic or cationic surfactants [258]. 

A similar system has furthermore been investigated by Gohy etal. [215,245] in the case of complex formation between P2VP-PEO and PEO-PMAA diblock copolymers as well as for combination of a PS-P2VP-PEO triblock with a PAA-PEO comb-block copolymer. The same concept was applied by Tenhu and co-workers [273] involving PEO-PMANa anionic block copolymer and a cationic graft copolymer. 

Uchman M et al (2013) Thermodynamic and kinetic aspects of coassembly of PEO-PMAA block copolymer and DPCl surfactants into ordered nanoparticles in aqueous solutions studied by TTC, NMR, and time-resolved SAXS techniques. Macromolecules 46 2172-2181. doi 10.102 l/ma302503w... 

Figure 4.29 Viscosity as a function of composition for PEO/PAA and PEO/PMAA and temperature variations reproduced (repiotted) from Baiiey, F. E., Lundberg, R. D.and Caiiard, R.W.J.Polym.Sci., Part A (1954) 2, p. 845 with permission from John Wiiey Sons, inc.,)...

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