Noncovalent linkage of telechelic oligo(dimethylsiloxanes) via end group attachment of host‐cyclodextrins and guest‐adamantanes or guest‐ferrocenes

Abstract

In this article, we report the noncovalent linkage of terminal substituted oligo(dimethylsiloxanes) bearing cyclodextrins (CD) as host endgroups and adamantan or ferrocene, respectively, as guest endgroups. Structural characterization was performed by 1H NMR‐, IR‐, and mass spectroscopy. Electron microscopy studies show significant differences in the surface structure of the individual derivatives. In addition, the ferrocene‐terminated di‐and poly(dimethylsiloxanes) are distinguished by a red‐ox activity and reversibility, which also makes the complexes between the ferrocene‐ and CD functionalized siloxanes switchable via electrochemical stimuli. The evidence for a successful complexation of the end groups, and thus the successful supramolecular formation of the siloxane strands, was even performed by shift of the protons in the 1H NMR spectra. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 2472–2482

Self‐assembly of telechelic polymers bearing adamantane groups via host‐guest inclusion complexes with cyclodextrin polymer

“…The self-assembly was affected by chain structure of telechelic polymers. [23] For Ada-PAA-SH polymer, aggregation was mainly hydrophobic Ada in core and spherical micelles were formed due to the excellent solubility of the PAA segment [22,32,42] ; addition the linear P(β-CD) the formation of inclusion complexation of β-CD and Ada enlarged the micelles, the hydrodynamic diameter was increased from about 184 nm to 232 nm (in Figure 5 and Table 2) and. The result was similar to that of TEM Photographs in Figure 5a,b.…”

“…The Ada-β-CD supramolecular interactions formed from a different host and guest molecular configurations have been successfully employed and reported. For example, Knudsen et al [23] incorporated the Ada or ferrocene end groups in oligo(dime-thylsiloxanes) (PDMS) and cyclodextrins host groups, respectively, and comprehensively investigated the supramolecular formation of the siloxane strands through complexation of the end groups in CHCl 3 . Christian et al [24] synthesized well-defined poly (2-hydroxyl propylamide) (PHPMA) with pendant β-cyclodextrin moieties via reversible additionfragmentation chain transfer (RAFT) polymerization and sequential postpolymerization modification and monoadamantly-functionalized linear polyglycerols (Ada-linPG) and obtained hyperbranched polyglycerols (Ada-hbPG) block copolymers.…”

Porous Carbons – Hyperbranched Polymers – Polymer Solvation

“…However, the applications of PA6 are still restricted in many fields owing to its poor flame retardant property and low limiting oxygen index (LOI)~21, and because it burns easily. Fang et al [257] synthesized hb polyphosphate bisphenol-S ester to improve the flame retardancy of PA6. Chen et al [258] synthesized hb polyphosphate ester (Scheme 27) and used it as curing agent and flame retardant in epoxy resins.…”

“…Here, either the polymer-bound ferrocene units interact with cyclodextrin (mixed concept) [170,171,255] or a cyclodextrin-based polymer allows the inclusion of ferrocene, which then also endows electrochemical properties (electrochemically induced complexation; Fig. 18) [256,257].…”

Linkage of α-cyclodextrin-terminated poly(dimethylsiloxanes) by inclusion of quasi bifunctional ferrocene

“…There are many reports on siloxanes bearing β-CD attached on the surface, which are used as stationary phases for chromatography and for drug-release systems [13–22]. In a previous paper we described the noncovalent AA–BB-type linkage of poly(dimethylsiloxanes) containing terminal ß-CD groups with terminally attached guest molecules on the poly(dimethylsiloxanes) [23]. With this in mind, the aim of our present study was to synthesize α-CD-terminated poly(dimethylsiloxanes) to create novel supramolecular linear or macrocyclic siloxan structures based on double inclusion complexes with ferrocene.…”