A Facile Approach towards Fluorescent Nanogels with AIE-Active Spacers
AbstractA facile and efficient approach for design and synthesis of organic fluorescent nanogels has been developed by using a pre-synthesized polymeric precursor. This strategy is achieved by two key steps: (i) precise synthesis of core–shell star-shaped block copolymers with crosslinkable AIEgen-precursor (AIEgen: aggregation induced emission luminogen) as pending groups on the inner blocks; (ii) gelation of the inner blocks by coupling the AIEgen-precursor moieties to generate AIE-active spacers, and thus, fluorescent nanogel. By using this strategy, a series of star-shaped block copolymers with benzophenone groups pending on the inner blocks were synthesized by grafting from a hexafunctional initiator through atom transfer radical copolymerization (ATRP) of 4-benzoylphenyl methacrylate (BPMA) or 2-(4-benzoylphenoxy)ethyl methacrylate (BPOEMA) with methyl methacrylate (MMA) and tert-butyldimethylsilyl-protected 2-hydroxyethyl methacrylate (ProHEMA) followed by a sequential ATRP to grow PMMA or PProHEMA. The pendent benzophenone groups were coupled by McMurry reaction to generate tetraphenylethylene (TPE) groups which served as AIE-active spacers, affording a fluorescent nanogel. The nanogel showed strong emission not only at aggregated state but also in dilute solution due to the strongly restricted inter- and intramolecular movement of TPE moiety in the crosslinked polymeric network. The nanogel has been used as a fluorescent macromolecular additive to fabricate fluorescent film. View Full-Text
- Supplementary File 1:
PDF-Document (PDF, 757 KB)
Share & Cite This Article
Feng, M.; Fang, L.; Guan, F.; Huang, S.; Cheng, Y.; Liang, Y.; Zhang, H. A Facile Approach towards Fluorescent Nanogels with AIE-Active Spacers. Polymers 2018, 10, 722.
Feng M, Fang L, Guan F, Huang S, Cheng Y, Liang Y, Zhang H. A Facile Approach towards Fluorescent Nanogels with AIE-Active Spacers. Polymers. 2018; 10(7):722.Chicago/Turabian Style
Feng, Meiran; Fang, Laiping; Guan, Fujun; Huang, Siying; Cheng, Yinwei; Liang, Yancui; Zhang, Hefeng. 2018. "A Facile Approach towards Fluorescent Nanogels with AIE-Active Spacers." Polymers 10, no. 7: 722.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.