New thermo-sensitive reactive polyethers basing on glycidol

Abstract

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Synthesis of poly(glycidol)‐block‐poly(N‐isopropylacrylamide) copolymers using new hydrophilic poly(glycidol) macroinitiator

“…Decreasing the amount of halides in the termination step (excess from six to two times with respect to active sites) did not improve results and did not prevent gelation as well. Explanation for this behavior can be assigned to acetal instability in acidic conditions, where even a small concentration of acid leads to intermolecular crosslinking 30…”

“…Explanation for this behavior can be assigned to acetal instability in acidic conditions, where even a small concentration of acid leads to intermolecular crosslinking. 30 To obtain PGl macroinitiator the two-step synthesis route presented in Figure 8 was applied. In the first step o-hydroxyl poly(glycidol acetal) was esterified using 2-halogenopropionyl halide, followed by removal of protective acetal groups of PGl under acidic conditions.…”

Polyvinylamine - a base for new routes in hydrophilic polymers development

“…Również dojście do w ielkocząs teczkowych połączeń wrażliwych na bodźce zewnętrz ne może być prostsze. Przykładem niech będą polimery wrażliwe na ciepło, otrzymywane często w wyniku oli-gomeryzacji oksiranów7 pod wpływ7em starterów7 z gru pam i hydroksylowym i [26], Tymczasem istnieje m ożli wość przeprow adzenia podobnych polireakcji z u dzia łem jednostek winyloaminowych (por. schemat A, reak cje 3 i 5).…”

One-Pot Synthesis of Polyglycidol-Containing Block Copolymers with Alkyllithium Initiators Using the Phosphazene Base t-BuP4

“…Linear polyglycidol can be functionalized with acetic anhydride or ethyl isocyanate to obtain polymers which have easily adjustable lower critical solution temperatures. 5,7,16 This opens a new application field for polyglycidol derivatives as thermosensitive polymers.Up to now, most of the initiators used for the anionic ringopening polymerization of EEGE are based on potassium or cesium alcoholates. 5,6,8,[17][18][19] However, block copolymers of EEGE and vinyl monomers, like styrene or dienes, cannot be synthesized in a one-pot procedure using commercially available alkyllithium initiators, as polymerization of epoxides does not proceed in the presence of Li + counterions.…”

“…Linear polyglycidol can be functionalized with acetic anhydride or ethyl isocyanate to obtain polymers which have easily adjustable lower critical solution temperatures. 5,7,16 This opens a new application field for polyglycidol derivatives as thermosensitive polymers.…”