A new polymerization method, termed as step transfer‐addition and radical‐termination, is developed for the step‐growth radical polymerization of α,ω‐unconjugated dienes under irradiation of visible light at room temperature (25 °C) for the first time. α,ω‐Diiodoperfluoroalkane monomers (signified as A) are added onto α,ω‐unconjugated dienes (signified as B) alternatively and efficiently with the generation of perfluorocarbon‐containing alternating copolymers (AB)n. Based on the combined analyses of polymerization kinetics and NMR spectra (1H and 19F), the mechanism of the novel polymerization method, including the side reaction, is proposed. This novel polymerization method provides a new strategy not only for the step‐growth radical polymerization of α,ω‐unconjugated dienes but also for the construction of high molecular weight perfluorocarbon‐containing alternating copolymers.
In this work, a novel methacrylate monomer with a bisphosphonate group was synthesized and then polymerized by RAFT polymerization to obtain well-defined polymers with better thermal and flame-retardant properties.
A facilely prepared GNR/LCE composite film with UV-triggered reversible dynamic crosslinking capable of near infrared (NIR)-driven macroscopic deformations, precise micro-patterned localization and re-shapeability.
In this work, polymerization of methyl methacrylate (MMA) was successfully conducted by atom transfer radical polymerization with activators generated by electron transfer (AGET ATRP) at 90°C, using iron(III) acetylacetonate (Fe(acac) 3 ) as a catalyst, ethyl alpha-bromophenylacetate (EBPA) as an initiator, ascorbic acid (AsAc) as a reducing agent and triphenyl phosphine (PPh 3 ) as a ligand. The polymerization kinetics showed that the polymerization rate (the conversion reached up to 98.1% after 60 min) was much higher than that mediated by inorganic iron salts and it was affected by the feed of the iron catalyst. Moreover, the kinetic plots were linear, and the molecular weights of the resulting polymers with molecular weight distribution around 1.2, increased linearly with monomer conversions, indicating good features of "living"/ controlled radical polymerizations. The end-functionality of the polymers was confirmed by 1 H NMR spectroscopy and a chain extension experiment.
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