Abstract
Stimuli-responsive polymeric systems containing special responsive moieties can undergo alteration of chemical structures and physical properties in response to external stimulus. We synthesized a hybrid amphiphilic block copolymer containing methoxy polyethylene glycol (MePEG), methacrylate isobutyl polyhedral oligomeric silsesquioxane (MAPOSS) and 2-(diisopropylamino)ethyl methacrylate (DPA) named MePEG-b-P(MAPOSS-co-DPA) via atom transfer radical polymerization (ATRP). Spherical micelles with a core-shell structure were obtained by a self-assembly process based on MePEG-b-P(MAPOSS-co-DPA), which showed a pH-responsive property. The influence of hydrophobic chain length on the self-assembly behavior was also studied. The pyrene release properties of micelles and their ability of antifouling were further studied.
Highlights
Stimuli-responsive polymers have attracted great attention because of their unique properties
The optical transmittance of the methoxy polyethylene glycol (MePEG)-b-P(MAPOSS-co-diisopropylaminoethyl methacrylate (DPA)) solution was obtained on a UV-2550 spectrometer (SHIMADZU, Kyoto, Japan) at 500 nm
It shows that the micelle size changes with the pH value of the aqueous solution, and the samples with a different proportion of methacrylate isobutyl polyhedral oligomeric silsesquioxane (MAPOSS) segments have a similar tendency of diameter variations
Summary
Stimuli-responsive polymers have attracted great attention because of their unique properties. The characteristics of these smart polymers can be adjusted by temperature, light, pH values, ionic strength, enzyme proteins, antigens, and so on [1,2,3,4,5,6]. Polyhedral oligomeric silsesquioxane (POSS), classified as a unique inorganic silica nanoparticle with a uniform cubic structure, has been widely incorporated into polymer matrices to produce novel organic/inorganic hybrid materials. Mreemthoavcerywlaatteeirs.oMbuettyhlaPcrOylSaSte(MisAobPuOtySlS)PpOuSrSch(aMseAdPfOroSmS)HpyubrcrihdasPeldastfircomCo. Hybrid Plastic Co. Styrene (Sinoreagent Co., Shanghai, China) was purified by passing through a column filled with basic Al2O3 prior to use. Styrene (Sinoreagent Co., Shanghai, China) was purified by passing through a column filled with basic Al2O3 prior to use. Other chemicals were purchased from Sinoreagent Co. and used as received
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