31645-35-9Relevant articles and documents
Flow Photochemistry for Single-Chain Polymer Nanoparticle Synthesis
Galant, Or,Donmez, Hasan Barca,Barner-Kowollik, Christopher,Diesendruck, Charles E.
, p. 2042 - 2046 (2021)
Single chain polymer nanoparticles (SCNP) are an attractive polymer architecture that provides functions seen in folded biomacromolecules. The generation of SCNPs, however, is limited by the requirement of a high dilution chemical step, necessitating the use of large reactors to produce processable quantities of material. Herein, the chemical folding of macromolecules into SCNPs is achieved in both batch and flow photochemical processes by the previously described photodimerization of anthracene units in polymethylmethacrylate (100 kDa) under UV irradiation at 366 nm. When employing flow chemistry, the irradiation time is readily controlled by tuning the flow rates, allowing for the precise control over the intramolecular collapse process. The flow system provides a route at least four times more efficient for SCNP formation, reaching higher intramolecular cross-linking ratios five times faster than batch operation.
Controlled radical polymerization of anthracene-containing methacrylate copolymers for stimuli-responsive materials
Yokoe, Makito,Yamauchi, Koji,Long, Timothy E.
, p. 2302 - 2311 (2016)
Novel reversible networks utilizing photodimerization of crosslinkable anthracene groups and thermal dissociation were investigated. Reversible addition-fragmentation chain transfer polymerization yielded well-defined copolymers with 9-anthrylmethyl methacrylate (AMMA) and other alkyl methacrylates such as methyl methacrylate (MMA) and 2-ethylhexyl methacrylate (EHMA) having different AMMA compositions. Well-controlled block copolymerization of AMMA and alkyl methacrylates was also successfully accomplished using a trithiocarbonate-terminated poly(alkyl methacrylate) macro-chain transfer agent. The anthracene-containing copolymers showed reversibility via crosslinking based on photodimerization with ultraviolet irradiation and subsequent thermal dissociation.
Photochemical formation of a core-crosslinked micelle using an anthracene-containing amphiphilic copolymer
Morikawa, Hiroshi,Kotaki, Yasuharu,Mihara, Ryota,Kiraku, Yuki,Ichimura, Shigetoshi,Motokucho, Suguru
, p. 682 - 683 (2010)
In order to develop photoresponsive polymeric micellar systems, an amphiphilic block copolymer consisting of anthracene moieties was successfully prepared by atom transfer radical polymerization. In an aqueous solution, the photodimerization of the anthracene moieties occurred in the micellar core upon irradiation (> 360 nm), keeping the mean diameter constant. The photodimerization caused the interpolymer reaction to form a core-crosslinked micelle.
Fluorescent nanostructures from aromatic diblock copolymers via atom transfer radical polymerization
You, Jungmok,Kim, Eunkyoung
, p. 10927 - 10934 (2016)
Well-defined fluorophore (anthracene or pyrene) containing copolymers were synthesized via atom transfer radical polymerization (ATRP) using methyl methacrylate (MMA) and fluorophore bound methacrylate (AntMA or PyMA). The copolymers exhibited clearly distinct thermal and optical properties, in terms of glass transition temperature (Tg) and emission spectrum, depending on the polymer structures. Moreover self-assembly properties of the copolymers affected the formation of the polymer nanostructures at condensed phase, to distinguish the random against block copolymers. The antracene containing random copolymer had a single Tg value while antracene containing block copolymer had two Tg values. In addition, sharp fluorescence peaks (398, 416 and 439 nm) werer observed in the random copolymer of antracene. In contrast, the anthracene containing block copolymer showed a broad tailing of the peak reaching ～550 nm. Interestingly, the copolymers having both randomly distributed anthracene units and consecutively connected pyrene units exhibited sharp emission at 398, 416, and 442 nm originated from the antracene unit and pyrene excimer emission at 482 nm. More importantly, well ordered nanopore films and nano scale micelle structures, originated from the self-assembly of antracene or pyrene block unit, were formed in block copolymers, while any type of an ordered structure was not found from the random copolymers. Therefore fluorescent nanostructures could be well-controlled by the polymers structures containing antracene and pyrene units, which might be widely useful for the development of novel photonics, optoelectronics, and sensor devices.
