Graft polymers amphiphilic

Wang [3] prepared the amphiphilic biocompatible cyclodextrin graft polymer, poly(ethylene glycol-g-cyclodextrin), (III), containing modified cyclodextrin which was used as a bioactive drug delivery agent. 

Polymers e-g may also be called collectively as polymers with controlled spatial shapes amphiphilic polymers (h) may include block, star-shaped, and graft polymers covered in classes b, e, and f. Comparison of Figs. 1 and 2 also tells us that, unlike the anionic and coordination (Zieglar-Natta) counterparts, cationic polymerization still fails to provide general methods to control the steric structures of polymers, although the first indication... 

The macromonomer method (C) has also been adopted in cationic polymerization. For instance, amphiphilic graft polymers of vinyl ethers are synthesized by the cationic polymerization of a vinyl ether-capped macromonomer (26) with a block copolymer chain consisting of IBVE and AcOVE segments, followed by alkaline hydrolysis of the latter part into the HOVE units [165], This graft polymer also undergoes a host-guest interaction similar to those with amphiphilic star block copolymers [220]. 

Foreman MB, Coffman JP, Murcia MJ, Cesana S, Jordan R, Smith GS, Naumann CA (2003) Gelation of amphiphilic lipopolymers at the air-water interface 2D analogue to 3D gelation of colloidal systems with grafted polymer chains. Langmuir 19 326-332... 

Poly[isobutylene-co-(p,m-chloromethylstyrene)]- graft copolymers were prepared by the grafting from method through the cationic polymerization of 2-methyl-2-oxazoline (MeOXA) initiated by a statistical copolymer of isobutylene and chloromethylstyrene. °° These amphiphilic graft polymers have a strong tendency to build aggregates in solution. 

Uozumi and coworkers prepared phosphine/palladium complexes supported on polyethylene glycol-polystyrene graft polymer. - This amphiphilic resin-supported palladium complex eftidently catalyzed the alkylation of allylic acetates in water with various nucleophiles including 1,3-dicarbonyl compounds, amino acids, sodium azide, sodium sulfinate, phenylboronic acid, and sodium tetraphenylborate to give the corresponding allylic-substituted products in quantitative yields. 

Markedly, surface-initiated ATRP provides the opportunity to use a variety of functional monomers, to tailor the composition and thickness of the brushes, and to prepare multiple functional surfaces. For example, Zhang et al. prepared poly(methyl methacrylate) (PMMA), poly(acrylamide) (PAAM), and their diblock copolymer (PMMA/PAAM) on the surface of PET film by surface-initiated ATRP [59]. The results indicated that the surface properties of PET film were greatly improved by grafted polymer, the surface of PET film modified by PAAM was hydrophilic, and the surface of PET film modified by diblock copolymer was amphiphilic. This kind of modified PET film may be applied as biocompatible materials, amphiphilic functional film, or conductive film. 

On the other hand, amphiphilic graft [78, 79] copolymers also present interesting phase behavior in solution. In the aspect of preparation of star-like or graft polymers, hyperbranched/dendritic chains are usually acted as a multi-sites... 

Amphiphilic Graft Polymers of Vinyl Ethers with Hydroxyl Groups... 

Such amphiphilic graft polymers may have almost uniform number of branches, provided that living polymerization of 23 is available. In addition, unlike the various types of star-shaped polymers previously reported [7,12,13], graft polymer 24 has no hydrophobic microgel core that may possess some dimensions. Therefore, the amphiphilic graft polymers are expected to possess properties and functions differing from those of the corresponding star block amphiphiles. 

Yin et al. [73,74] prepared new microgel star amphiphiles and stndied the compression behavior at the air-water interface. Particles were prepared in a two-step process. First, the gel core was synthesized by copolymerization of styrene and divinylbenzene in diox-ane using benzoylperoxide as initiator. Microgel particles 20 run in diameter were obtained. Second, the gel core was grafted with acrylic or methacryUc acid by free radical polymerization, resulting in amphiphilic polymer particles. These particles were spread from a dimethylformamide/chloroform (1 4) solution at the air-water interface. tt-A cnrves indicated low compressibility above lOmNm and collapse pressnres larger than 40 mNm With increase of the hydrophilic component, the molecnlar area of the polymer and the collapse pressure increased. 

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