Comparison of Hyperbranched and Linear Polyglycidol Unimolecular Reverse Micelles as Nanoreactors and Nanocapsules

Kumar, K. Rajesh; Brooks, Donald E.

doi:10.1002/marc.200400482

Cited by 57 publications

(47 citation statements)

References 20 publications

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“…In addition to the entropic corrections of the LCT, also the energetic corrections to the FH theory have to be determined. The first order mixing energy ( ) as well as the second order mixing energy ( ) can be expressed as a sum [56]: (38) where the contributions and are given in literature [56]. These contribution depend on the architecture via and additionally from the difference in interaction energy of component and , expressed by the three interaction parameters , , and .…”

Section: Lct For a Ternary Polymer Solutionmentioning

confidence: 99%

“…Based on these advantages of HBP different applications have been suggested, for instance possible implementations of HBP are discussed in the field of medicine [1][2][3][4][5][6][7][8], catalysis [9][10][11][12][13], membrane materials [14][15][16][17][18][19][20], chemical engineering [21][22][23][24], sensors [25][26][27][28], thermosets [29][30][31] or as rheological modifier [32,33]. Polymeric drug delivery systems offer great opportunities to effectively control the drug release in human body [34][35][36][37][38][39][40][41][42][43][44]. In addition dendrimers can be surface engineered to release the drug at desired site, that is, as targeted drug delivery.…”

Section: Introductionmentioning

confidence: 99%

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Phase Diagrams for Systems Containing Hyperbranched Polymers

et al. 2012

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Abstract:Hyperbranched polymers show an outstanding potential for applications ranging from chemistry over nanotechnology to pharmacy. In order to take advantage of this potential, the underlying phase behaviour must be known. From the thermodynamic point of view, the modelling of these phase diagrams is quite challenging, because the thermodynamic properties depend on the architecture of the hyperbranched polymer as well as on the number and kind of present functional end groups. The influence of architecture can be taken into account via the lattice cluster theory (LCT) as an extension of the well-known Flory-Huggins theory. Whereas the Flory-Huggins theory is limited to linear polymer chains, the LCT can be applied to an arbitrary chain architecture. The number and the kind of functional groups can be handled via the Wertheim perturbation theory, applicable for directed forces between the functional groups and the surrounding solvent molecules. The combination of the LCT and the Wertheim theory can be established for the modelling or even prediction of the liquid-liquid equilibria (LLE) of polymer solutions in a single solvent or in a solvent mixture or polymer blends, where the polymer can have an arbitrary structure. The applied theory predicts large demixing regions for mixtures of linear polymers and hyperbranched polymers, as well as for mixtures made from two hyperbranched polymers. The introduction of empty lattice sites permits the theoretical investigation of pressure effects on phase behaviour. The calculated phase diagrams were compared with own experimental data or to experimental data taken from literature. OPEN ACCESSPolymers 2012, 4 73

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Section: Lct For a Ternary Polymer Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Diagrams for Systems Containing Hyperbranched Polymers

et al. 2012

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“…48 Up to now, water-soluble hyperbranched poly(glycidol) (HPG) has been used widely to prepare amphiphilic molecular nanocapsules because it is highly biocompatible and without evident animal toxicity, which could encapsulate polar guests from water. 34,[49][50][51][52][53][54][55][56][57][58][59][60] Peng et al 50 have obtained star-hyperbranched block copolymers of HPG-b-polystyrene using atom transfer radical polymerization; these have good structural formation for ionic conductivity. Brooks et al 60 have reported the use of amphiphilic HPG as nanoreators for unimolecular elimination reactions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of thermoresponsive unimolecular polymeric micelles with a hydrophilic hyperbranched poly(glycidol) core

Luo

Zhang

et al. 2010

Polym J

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This paper describes the reversible phase transition behavior of a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) shell at the surface of a hydrophilic core. Reversible addition-fragmentation transfer (RAFT) polymerization of N-isopropylacrylamide was conducted using a hydrophilic hyperbranched poly(glycidol) (HPG)-based macroRAFT agent. At lower temperatures (o30 1C), the resultant multiarm star block copolymer (HPG-PNIPAM) exists as unimolecular micelles, with hydrophilic HPG as the core and a densely grafted PNIPAM brush as the shell. In laser light scattering (LLS) studies, the concentration used for HPG-PNIPAM is 5Â10 À6 g ml À1 , to avoid any possible aggregation between dendritic unimolecular micelles above the lower critical solution temperature (B32 1C) of PNIPAM. What we observe for the phase transition of HPG-PNIPAM involves only unimolecular process. A combination of dynamic and static LLS studies of HPG-PNIPAM in aqueous solution reveals a reversible phase transition on heating and cooling.

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“…Thus, various types of dendrimers, star polymers, and hyperbranched polymers have been synthesized and their properties were compared to the linear analogues. 23,[33][34][35][36][37][38][39][40][41][42][43][44][45][46] easily than glycodendrimers and star-shaped glycopolymers. [71][72][73][74][75][76] Recently, we proposed that the ringopening multibranching polymerization of anhydro and dianhydro sugars as latent AB m -type monomers should be a convenient method of synthesizing hyperbranched glycopolymers with a novel spherical macromolecular architecture, [77][78][79][80][81][82][83] for example, the hyperbranched polysaccharides from the cationic polymerization of 1,6-anhydro--D-hexopyranose, the hyperbranched poly(2,5-anhydro-D-glucitol) from 1,2:5,6-dianhydro-D-mannitol, and the hyperbranched polytetritols of 1,4-anhydrotetritol and 2,3-anhydrotetritol.…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched 5,6-glucan as reducing sugar ball

et al. 2010

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Reducing sugar ball Au (III)Au (0) A hyperbranched glycopolymer arranged with numerous reducing D-glucose units on the peripheries of the polymer, i.e., "reducing sugar ball", possessed a higher reducing ability than D-glucose because of the glyco-cluster effect or the multivalent effect of the D-glucose units.2Abstract. The ring-opening polymerization of 5,6-anhydro-1,2-O-isopropylidene--D-glucofuranose (1) as a latent cyclic AB 2 -type monomer was carried out using potassium tert-butoxide (t-BuOK) or boron trifluoride diethyletherate (BF 3 ·OEt 2 ) as an initiator in order to synthesize a novel hyperbranched glycopolymer. The anionic and cationic polymerizations proceeded via the proton-transfer reaction mechanism to produce the hyperbranched poly(5,6-anhydro-1,2-O-isopropylidene--D-glucofuranose) (2). In particular, the cationic polymerization with the slow-monomer-addition strategy is a facile method leading to the hyperbranched glycopolymers with high molecular weights and highly branched

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Comparison of Hyperbranched and Linear Polyglycidol Unimolecular Reverse Micelles as Nanoreactors and Nanocapsules

Cited by 57 publications

References 20 publications

Phase Diagrams for Systems Containing Hyperbranched Polymers

Phase Diagrams for Systems Containing Hyperbranched Polymers

Synthesis of thermoresponsive unimolecular polymeric micelles with a hydrophilic hyperbranched poly(glycidol) core

Hyperbranched 5,6-glucan as reducing sugar ball

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