Effect of preparation conditions for poly(ethylene glycol)/cyclodextrin polyrotaxane on modes of end‐capping reactions and decomposition of the yielded polyrotaxane

Steric Stabilization of “Charge-Free” Cellulose Nanowhiskers by Grafting of Poly(ethylene glycol)

“…Another component of the reaction, i.e. , mPEG1000 with terminal carboxyl groups, seemed to be available by the previously reported oxidation using TEMPO [47,48,49], a water-soluble radical oxidizing agent. However, the final step in the collection of the oxidized mPEG, i.e.…”

“…However, the final step in the collection of the oxidized mPEG, i.e. , precipitation of the oxidized mPEG in cooled ethanol [47,48,49], may have been unsuccessful due to the relatively low molecular weight (1000) of PEG in the present study. This drawback was resolved by the use of silica gel catalysts carrying TEMPO moieties on their surface, instead of an aqueous TEMPO solution.…”

“…Terminal hydroxyl groups of mPEG1000 were oxidized into carboxyl groups according to previously published procedures [47,48,49], with the modification of using silica gel particles carrying the TEMPO moieties instead of aqueous TEMPO solution. For this purpose, silica gel supported TEMPO was prepared via reductive amination of the amino groups on the silica gel and 4-oxo TEMPO, according to the literature [50].…”

One Pot Synthesis of a Polyisoprene Polyrotaxane and Conversion to a Slide‐Ring Gel

“…Synthesis of polyrotaxanes from poly(ethylene glycol) (PEG) was pioneered by the group of Harada . PEG with amino, tosyl, or carboxylate end groups complexed in α‐CD have been stoppered by attachment of bulky substituents (e.g., disubstituted phenyl‐ or adamantanyl‐groups). The often low yields of stoppering are improvable by the use of organic solvents, like N , N ‐dimethylformamide (DMF), but these solvents also foster dissociation of the threaded rings.…”

Cyclodextrin-based rotaxanes

“…Many CD-based rotaxanes, further referred to as CD rotaxanes are known [25][26][27][28], along with CD polyrotaxanes [29][30][31][32][33][34][35]. One should point out that CD polyrotaxanes are large family which may be divided into species containing long polymer chains (such as PEG, PEO, PANI, PNIPA etc.)…”