Selective Encapsulation of Ionic Dyes by Core/Shell Amphiphilic Macromolecules Derived from Hyperbranched Polyethylenimine: Properties through Structures

Abstract

Reverse‐micelle‐like CAMs derived from HPEI, which exist as either aggregates or unimolecular micelles, show selectivity upon the encapsulation of water‐soluble and ionic dyes. For rigid dyes, the encapsulating ability is very weak, while for less rigid ones, the encapsulation is dependent on their electronic properties. Through electronic engineering of the CAM, the complementary CAM/dye interaction strengths can be greatly favored or disfavored. Electronic engineering of the CAM can also exert a non‐linear effect on the guest affinities and thus amplify the difference of the competitive guest species and further lead to highly selective encapsulations. Even if one dye species is complexed by another dye species, highly selective encapsulation can still be realized by a CAM.magnified image

Facile and efficient synthesis of hyperbranched polyesters based on renewable castor oil

“…Hyperbranched polymers have been much studied and widely used recently for biomedical materials, coatings, additives, drug and gene delivery, nanotechnology and macromolecular building blocks, and in supramolecular science . They are characterized by unique three‐dimensional globular architectures, low viscosity, good solubility and abundance of end functional groups .…”

Kinetic topology‐selective encapsulation and mixture separation by a nanocapsule with hyperbranched polyethylenimine as core and polystyrene as shell

“…For those dyes which cause no precipitation, the values are 12.0 for RB and 35 for AB25. Although DB71 and OB80 were unable to be encapsulated within 26 h by a CAM similar to 2a , here we find that encapsulation and phase transfer is possible when the exposure time is extended to 3 days, and 2a and 2b are less able to differentiate dyes than 1a and 1b .…”

“…), are used in place of CR and show similar phenomena, as shown in Figure (B–E). 2a is less effective to differentiate these dyes, as similar CAMs were …”

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

“…However, if limited cetyl chains are introduced to one PEI, the resulting product appears to be poorly soluble in either polar or apolar media, possibly because of the strong complementary interactions among the polar cores. Several methods, including well-defined ones [33], have been developed for the synthesis of PEI macrosurfactants [25][26][27][28][29][30][31][32][33][34]. The reaction between epoxy compounds and primary or secondary amino groups is mild, efficient, and does not release side products.…”

“…PEI macrosurfactants are also called molecular nanocapsules due to their covalent nature [25][26][27][28][29][30][31][32][33][34][35][36][37]. These nanocapsules can undergo guest encapsulation via liquid-liquid phase-transfer extraction [26][27][28][29][30][31][32][33][34][35][36][37]. Unlike dendrimers, PEI macrosurfactants rarely show topological selectivity over guest sizes [33] but widely show charge-selective encapsulation [32][33][34][35].…”