Comb copolymers

Comb copolymers, 7 610t Combed yarn, 11 178 Combes synthesis, of quinolines, 21 189 Combicat, 7 387, 392 Combinational libraries, 7 382 characterization, 7 404-405 composition gradient libraries, 7 407 design, 7 399-400 fabrication, 7 414-419 temperature gradient libraries, 7 407—408 thickness gradient libraries, 7 406 Combination electrodes, 14 30 Combination vaccines, 25 504-505 Combinatorial biology, 16 414 Combinatorial biosynthesis, 15 301-302, 305... 

Asatekin A, Kang S, Elimelech M et al (2007) Anti-fouling ultrafiltration membranes containing polyacrylonitrile-graft-poly(ethylene oxide) comb copolymer additives. J Membr Sci 298 136-146... 

Block copolymers with organic polymers Block copolymers with polysiloxanes Comb copolymers Fuel cell membranes ROMP polymerizations Azide coupling to organic polymers ADMET polymerizations... 

Hydrogen-Bonded Comb Copolymers Nonmesogenic Side Chains. 129... 

Block Copolymer-Based Hydrogen-Bonded Comb Copolymers. 137... 

Hydrogen-Bonded Comb Copolymers Mesogenic Side Chains. 157... 

Hydrogen-Bonded Comb Copolymers Nonmesogenk Side Chains... 

Fig. 13 Illustration of the formation of hydrogen-bonded comb copolymers and subsequent micellization in a selective solvent. Reprinted with permission from [127]. 2005 American Chemical Society...

To synthesise polymers with unusual properties from existing basic monomers one needs to place the monomer units in ordered arrays rather than at random. Thus polymer architecture control remains an important area of research. Possible structural elements include block, graft and comb copolymers as well as star and dendritic/hyperbranched topographies. Potential for such structures in the surface coatings and adjacent industries include use as... 

In some instances, the macromonomers synthesized by CCT can be copolymerized with acrylics to form comb copolymers. While /1-scission predominates in copolymerizations with methacrylates, acrylates and styrene give both incorporation to yield comb copolymers and /1-scission.492 Products of this type have been thoroughly characterized by a variety of spectroscopic techniques. When high levels of CCT macromonomers are employed, it is possible to go beyond the comb structure and obtain more highly branched polymers.493... 

Fig. 4.16 shows a direct synthesis pathway to A-B block or comb copolymers using the same simple chemistry. 

In contrast to the situation found for dilute solutions, the behavior of nonlinear block copolymers in the solid state seems to have attracted great attention. Many theoretical publications appeared in recent years, dealing mainly with the phase behavior of star-block, simple graft and comb copolymers. Issues like the nature of the phase diagram and the order-disorder transition have been studied in considerable detail. The compatibilizing effects of complex copolymers, in comparison to simple diblock copolymers, were also investigated. 

The same group has also presented Monte Carlo calculations on the compati-bilizing effect of comb copolymers [328]. Their interfacial behavior was compared with that of linear multiblock copolymers. By varying the numbers and lengths of the teeth it was demonstrated that combs with fewer and longer teeth localize themselves easier at the interface between two homopolymers, of the same nature as the backbone and teeth, than combs with a larger number of shorter teeth. In... 

The same group used analytical arguments and numerical self-consistent field calculations to compare the interfacial tensions for a system of A and B homopolymers, immiscible with each other, having AB diblocks and comb copolymers localized at the interface [330,331]. In this case the overall molecular weight of the compatibilizer molecule was kept constant and the architecture was varied. At fixed N and > as the number of teeth increased the comb becomes less efficient at reducing the interfacial tension as compared to the diblock. At high values of N and x> the difference between the architectures becomes more pronounced. The diblock produces the lowest interfacial tension at the lowest concentrations. On the other hand, long combs with multiple teeth were found to be more efficient compatibilizers than short diblocks. 

Yu WH, Kang ET, Neoh KG. Controlled grafting of comb copolymer brushes on poly-(tetrafluoroethylene) films by surface-initiated living radical polymerizations. Langmuir 2005 21(l) 450-6. 

KOH Koh, A.Y.C., Heenan, R.K., and Saunders, B.R., A study of temperature-induced aggregation of responsive comb copolymers in aqueous solution, Phys. Chem. Chem. Phys., 5, 2417, 2003. 

Jian CM, Gong C, Wang SQ, Wang SF, Xie XM, Wei Y, Yuan JY (2014) Multifunctional comb copolymer ethyl cellulose-g-poly(e-caprolactone)-rhodamine B/folate synthesis, characterization and targeted bonding application. Eur Polym J 55 235-244... 

PCEVE-b-(PAcEVE-g-PMVE), linear-fa-PMVE comb copolymers ... 

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