The free radical polymerization of styrene was initiated with azobis(isobutyronitrile) in the presence of benzene sulfonyl chloride. Analysis of the terminal structures of the obtained polystyrene with 1 H NMR spectroscopy revealed the presence of a phenylsulfonyl group at the α-end and a chlorine atom at the ω-end of each polystyrene chain. The terminal chlorine atom in the polystyrene chains was further confirmed through atom transfer radical polymerization (ATRP) of styrene and methyl acrylate using the obtained polystyrenes as macroinitiators and CuCl/2,2'-bipyridine as the catalyst system. GPC traces of the products obtained in ATRP at different reaction times were clearly shifted to higher molecular weight direction, indicating that nearly all the macroinitiator chains initiated ATRP of the second monomers. In addition, the number-average molecular weights of the polystyrenes increased directly proportional to the monomer conversions, and agreed well with the theoretical ones.
Lithium rechargeable battery is a new type of battery developed in recent years. The
studies on this system are naturally focused on the cathode material. The cathode material with
conducting skeleton and energy-storing side lines was reported and a novel material carbyne
polysulfide was studied. This paper was to explore a convenient approach for preparing carbyne
polysulfide. The products obtained by co-heating polyvinylidene chloride(PVDC) and pulverized
sulfur in ammonia environment was characterized by DSC /TG, IR, Raman spectrums and
elemental analysis. And the product had been proved to have a sp2 hybride carbon skeleton with
polysulfide attached on it, which resembles the theoretical structure of carbyne polysulfide. The
material with favorable sulfur contents exhibited high specific capacity up to 705 mAh/g in the
initial cycle and a stable reversible capacity approximately 420 mAh/g.
Poly(ε-caprolactone) (PCL)-polystyrene (PS)star-block copolymer with a cross-linked microgel core were synthesized by the combination of atom transfer radical polymerization (ATRP) of St and lipase-catalyzed ring-opening polymerization (ROP) of ε-CL. The characterization of PCL-Br, PCL-PS-Br macroinitiator and PCL-PS Star-block copolymers was detected by GPC and 1H NMR. Results showed that the target star-block copolymers were successfully prepared.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.