Functional comb polymers

Functional comb polymers can be prepared by several techniques, e.g. by polymerization or copolymerization of functional macromonomers. The functional groups can be placed on side-chain extremities or distributed along the side chains. Also the backbone chain can carry functional groups. Functional combs are used as modifiers of surface activity. 

Comb polymers consist of a backbone and several branches [9]. Backbone and branches are usually recognized from the synthetic procedure. The branching functionality is usually limited to 3 or 4. The backbone and/or the branches can be monodisperse. In a regular comb polymer the number of branch points per backbone is constant and the branches are equidistantly spaced along the... 

Functionalized comb-like polymers synthesis, modification and application. [H. Ritter, Angew. Makromol. Chem. 1994, 223, 165-175] [ 1777]. 

This polymer may be considered as a comb-polymer, based on poly(acrylonitrile), with a mesogenic group and two functional linking groups inserted in the side chain the molar mass of the whole structural unit is 496. 

The polymer consists of the comb-polymer, discussed sub (a) with a mesogenic group with two functional linking groups, inserted into the side-chain. Hence ... 

Combination of a living ionic polymerization and a metal-catalyzed radical polymerization also leads to comb polymers, where both the molecular weights of the arm and main-chain polymers are well controlled. PMMA with poly(vinyl ether) arm polymers of controlled molecular weights (C-l) were prepared by the copper-catalyzed radical polymerization of methacrylate-capped macromonomers carrying a poly-(isobutyl vinyl ether), which were obtained by living cationic polymerization with a methacryloxy-capped end-functionalized initiator.428 Comb polymers with... 

Comb polymers (Figure 1.10) alter a polymer structure and can be used to modify the functionality of polymer surface. 

An lUPAC publication (11) discusses both structure-based and source-based representations of comb polymers acomb polymer is described as a macromolecule comprising a main chain with trifunctional points from which linear side chains emanate. If the subchains between the branch points of the main chain and the terminal subchains of the main chain are identical with respect to constitution and degree of polymerization, and the side chains are identical with respect to constitution and degree of polymerization, the macromolecule is termed a regular comb macromolecule. If at least some of the branch points are of functionalities greater than three, the macromolecule may be termed a brush macromolecule. 

Z]p chain transfer agent concentration inside particle -ab- linkage in condensation aPP atactic polypropylene Os specific area of surfactant comp/y/rj composition distribution / initiation efficiency or functionality fi mole fraction of monomer i / function in comb polymer function in comb polymer... 

A hydroxyl ftmaional comb polymer is made by the synthesis of block maaomonomers by CCTP, which contain hydroxyl functionality and copolymerizing these with acrylic monomers to form a comb polymer. The amount of hydroxyl functionality of the macromonomer depends on the application, but by tuning this level it was found to increase the pot life of the paint and also the initial hardness. Acrylic comonomers can also be used to achieve properties such as hardness, appearance, and scratch resistance. This comb polymer is... 

For a comb polymer including x points of branching of functionality/ and p grafts,... 

Figure 9 Plots showing linear relations between [rj /blle g for branched polystyrene in decalin. Data points are for two comb polymers [24 branches, x 10" = 24 x 4.62 + 133 (pips down) 22 branches, x = 22 x 12.0+ 133 (pips up)] and for a star polymer [M x 10" = 4 x 40 (cross within circles)]. The dashed line is the experimental function for linear chains (reproduced by permission of Wiley, from J. Polym. Scl. Part A-2, 1971, 9, 710)...

Fournier D, Pascual S, Montembault V, Haddleton DM, Fontaine L (2006) Well-defined azlactone-functionalized (Co)polymers on a solid support synthesis via supported living radical polymaization and application as nucleophile scavengers. J Comb Chem 8 522-530... 

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