Exploring and Expanding the Three-Dimensional Structural Diversity of Supramolecular Dendrimers with the Aid of Libraries of Alkali Metals of Their AB3 Minidendritic Carboxylates

“…Subsequently, the organizational features of such multi-alkoxy substituted dendrons were successfully used through the polymerization of various such vinylic macromonomers towards the development of new macromolecular objects of well-defined, predictable shapes. [9][10][11][12][13][14][15][16] In general, an intense scientific effort has been devoted towards the syntheses and conformational characterization of various dendronized polymers. [17][18][19] Also natural amphiphilic dendritic dipeptides have recently been reported which self-assemble in solution and in bulk through a complex recognition process into helical pores.…”

Section: Introductionmentioning

confidence: 99%

Effect of Structural Parameters on the Supramolecular Organization of Rigid‐Flexible Polymers

Carbonnier

Andreopoulou

Pakuła

et al. 2004

Macro Chemistry & Physics

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Summary: Rigid‐flexible polyethers consisting of terphenyl and aliphatic segments of various lengths along their main chains and disubstituted by dendritic wedges of various generations (G0, G1, and G2) are examined in their bulk states. Characterization of phase transitions has been performed by means of differential scanning calorimetry (DSC) and was supported by structural information obtained from small‐angle light scattering (SALS) and polarized optical microscopy (POM) experiments. In order to characterize order on the molecular size scale, two‐dimensional (2D) wide‐angle X‐ray diffraction (WAXS) experiments have been performed for macroscopically oriented samples. All results pointed out a highly ordered nature of these materials. Both monomers and polymers were characterized. In the case of polymers, structures consisting of layered backbone sheets separated by the side dendritic moieties filling the space between them were deduced. In all cases, strong effects of molecular parameters, such as main chain flexible spacer's length and sizes of substituents, on transition temperatures (odd‐even effect), degree of orientation, and distances characteristic for the supramolecular structures, were observed.Example of 2D X‐ray diffraction patterns recorded for oriented films of the polymers PETH‐(2OC12H25) (the zero generation).magnified imageExample of 2D X‐ray diffraction patterns recorded for oriented films of the polymers PETH‐(2OC12H25) (the zero generation).

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“…In the particular case of dendrons 16, 17, and 18, a micelle contains, respectively, 12, 6, and 2 molecules on average. In the case of the ''minidendrons'' G1, that is, carboxylate salts 15, the unit cell is significantly smaller (a ∼ 3 nm) and the number of molecules per micelle is around 30 [83].…”

Section: Micellar Phases 21mentioning

confidence: 99%

“…Figure 7.17a shows the dependence of transition temperatures of alkali metal salts of 3,4,5-tris-tetradecyloxybenzoic acid (compounds 15) on the cation diameter [83]. The micellar BCC phase with Im3m symmetry is the highest temperature LC phase for all compounds 15, that is, for cations from Li + to Cs + and for alkyl chains from dodecyl to octadecyl.…”

Section: Micellar Body-centered Cubicmentioning

confidence: 99%

“…When the alkyl chains are offered too much lateral area by the spherical surface, and too little by the cylindrical surface, the system looks for a packing equivalent to the solution of the Kelvin problem. In most supramolecular dendrimers, where there is an LC phase below the temperature range of the Pm3n, that phase is hexagonal columnar [83,111]. This suggests that, of the structures described so far, only a 2D honeycomb foam has a lower surface area than the Weaire-Phelan structure [82].…”

Section: Packing Of Soft Ballsmentioning

confidence: 99%

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