Predictive design of polymer molecular weight distributions in anionic polymerization

Abstract

Polymer molecular weight distributions are targeted through kinetic modeled with high fidelity based on the temporal control of chain initiation in anionic polymerizations.

Tailoring polymer dispersity and shape of molecular weight distributions: methods and applications

“…59 In 2019, the same group also presented a theoretical model that enables the accurate prediction of MWD composition for a range of initiator addition proles when polystyrene was synthesised by anionic polymerisation. 60 Despite the great capability of this methodology to successfully control the shape and dispersity of MWDs, all examples exhibited signicant tailing at either low or high molecular weight and thus were relatively asymmetrical. Frey and co-workers could partially address this problem in continuous ow, where by varying the total ow rate they were able to achieve more symmetrical MWDs.…”

Precise modulation of molecular weight distribution for structural engineering

“…[21][22][23] Recently, Fors 13,24 and Cölfen 15 further demonstrated initial attempts to control the shape of the molecular weight distribution by manipulating the initiation process, such as temporal control of the initiator addition, or spatial control of the initiator gradient. Though the molecular weight distribution can be regulated to some extent, [25][26][27] precise control is not possible due to the essential statistical nature of chain growth. The batch-to-batch variation would severely impede further systematic studies.…”

NMR spectrocopy of organolithium compounds, part XXXIV: Cyclopropyllithium and lithium bromide (1:1) in diethylether/tetrahydrofuran—Identification of a fluxional mixed tetramer

“…The investigation of their aggregate formation is thus of continued interest and might help to better understand the reactivity of these species. [1d, 2] The method of choice in this field is in most cases high‐resolution NMR spectroscopy using nuclei like 1 /H, 6 Li, 7 Li, 13 C, and others. [1g, i, j]…”