Hydrolysis and Subsequent Quaternization of Poly[(Isobutene-co-(m,p)-chloromethylstyrene)-g-2-methyl-2-oxazoline] and Poly((m,p)-Chloromethylstyrene-g-2-methyl-2-oxazoline)

Nuyken, Oskar; Sánchez, Juan Rueda; Voit, Brigitte

doi:10.1080/10601329708009384

Cited by 2 publications

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“…In literature, few examples of copolymers composed of poly(2-oxazoline) and PIB segments can be found. PIBs equipped with electrophilic end groups have been used as macroinitiators in the CROP of 2-oxazolines, especially 2-methyl-2-oxazoline (MeOx) or 2-ethyl-2-oxazoline (EtOx), to afford the corresponding PIB- b -poly(2-oxazoline) diblock copolymers. − This strategy has been expanded to telechelic and three-arm star PIB macroinitiators as well as isobutylene–chloromethylstyrene copolymers, which led to triblock, star, and graft copolymers, respectively. − However, in case of initiator groups with insufficient reactivity, the macroinitiator approach bears the risk of producing rather broad molecular weight distributions. Alternative strategies are based on coupling preformed PIB and poly(2-oxazoline) building blocks. , Surprisingly, micellar self-assembly of amphiphilic PIB–poly(2-oxazoline) copolymers has not been studied in detail.…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive Polymer Ionic Liquids and Nanostructured Hydrogels Based upon Amphiphilic Polyisobutylene-b-poly(2-ethyl-2-oxazoline) Diblock Copolymers

et al. 2019

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The precise molecular engineering of amphiphilic diblock copolymers as thermoresponsive polymer ionic liquids (PILs) couples polyisobutylene (PIB) and poly(2ethyl-2-oxazoline) (PEtOx) blocks via an imidazolium cation. It enables thermal switching of micellar self-assembly and yields nanostructured hydrogels. Just one ionic liquid (IL)type imidazolium cation is readily incorporated into the backbone of the PIB−IL−PEtOx block copolymers by terminating the cationic 2-ethyl-2-oxazoline (EtOx) ringopening polymerization by alkylation of an imidazoleterminated PIB. The PEtOx block length varies as a function of the PIB-imidazole/EtOx molar ratio and governs solubility, hydrophilic/hydrophobic balance, and nanophase separation. In spite of the presence of highly hydrophobic PIB segments, PIB−IL−PEtOx are rendered water soluble with increasing PEtOx block length and form spherical and elongated micelles as well as hydrogels exhibiting wormlike nanostructures. Furthermore, the lower critical solution temperature of PEtOx segments is the key to thermoresponsive behavior of both water-soluble copolymers and copolymer hydrogels. Owing to low glass temperature and high stability of PIB, these PIB−PILs represent attractive macromolecular nanosystems enabling thermal switching of solubilization, dispersion, transport, and shuttling of molecules and nanoparticles.

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