Li, Tzu-Han; Yadav, Vivek; Conrad, Jacinta C.; Robertson, Megan L. published their research in ACS Macro Letters in 2021. The article was titled 《Effect of Dispersity on the Conformation of Spherical Polymer Brushes》.Quality Control of Cupric bromide The article contains the following contents:
We show that dispersity (D) markedly alters the conformation of spherical polymer brushes. The average lengths (lb) of poly(tert-Bu acrylate) (PtBA) brushes of varying D grafted to nanoparticles were measured using dynamic light scattering. In the semidilute polymer brush (SDPB) regime, the lb of PtBA and polymers from earlier studies of various D could be cleanly collapsed onto a master curve as a function of the scaling variable Nwσ1/3, where Nw is the weight-average d.p. and σ is the grafting d. In the concentrated polymer brush (CPB) regime, however, lb collapsed onto a bifurcated curve as a function of the scaling variable Nwσ1/2, indicating D more strongly affects the average length of brushes with low Nwσ1/2. We propose that the stretching of the stem near the particle surface due to interchain interactions in the CPB regime leads to greater lb in broad dispersity brushes of low but not high Nwσ1/2. In the experimental materials used by the author, we found Cupric bromide(cas: 7789-45-9Quality Control of Cupric bromide)
Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Quality Control of Cupric bromide
Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”