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Synthesis and self-assembly of a simple CO2-responsive diblock polymer

Zhang Pengfei, Jing Xianwu, Zhou Lang, Liu Qiang, Zhang Yadong

Polish Journal of Chemical Technology

2024

Vol. 26, nr 3

16--20

Methoxypolyethylene glycol 1900 and α-bromoisobutanoyl bromide were utilized for alcoholysis reaction to obtain a macromolecular initiator. Then, a simple amphiphilic diblockpolymer (mPEG-PDMAEMA) based on the initiator and dimethylaminoethyl methacrylate was synthesized through the atomic transfer radical polymerization (ATRP) method. The structures of the initiator and diblock polymer were accurately characterized using infrared spectrum and proton nuclear magnetic resonance spectroscopy (1H NMR). Cryo-transmission electron microscopy revealed the self-assembly of mPEG-PDMAEMA into vesicle-like structures in water. Upon injection of CO2 into the solution, the tertiary amine structure within PDMAEMA underwent protonation, resulting in the mPEG-PDMAEMA adopting a hydrophilic structure. Consequently, the vesicles dissociated and dispersed, forming a network-like structure in water. The protonation phenomenon was confi rmed by 1H NMR, as evidenced by the shifting of alkyl hydrogen atoms near nitrogen atoms toward downfi eld positions.

Silicone nanostructures

Kępczyński M., Kuźmicz D., Romek M., Nowakowska M.

Polish Journal of Applied Chemistry

2009

Vol. 53, nr 1

37-42

Polysiloxane with covalently attached undecanoic acid groups was obtained in a two-step synthesis. Four molecules of methyl undec-10-enoate were attached to 1,3,5,7-tetramethylcyclotetrasiloxane (D4H) by hydrosilylation reaction yielding a new monomer, tetra(l 1-methoxy-l l-oxoundecyl)tetramethyl-cyclotetrasiloxane . The monomer was polymerized using anionic ring opening polymerization with concomitant hydrolysis of ester bonds. The silicone polymer thus obtained can self-organize in aqueous environment forming large objects, probably vesicles, with diameter of 1 pm. Silicon nanocapsules of controlled size can be prepared in a simple way in the polymerization processes of Dj""1*"'1 within vesicle templates. The monomer swells the surfactant vesicles up to 50 mol % based on the surfactant. Polymerization of D4"IK,"yl inside membrane yields nanocapsules of size similar to the originate vesicles.