Polyolefin catalysis of propene, 1-butene and isobutene monitored using hyperpolarized NMR.

ABSTRACT: Polymerization reactions of the dissolved gases propene, 1-butene, and isobutene catalyzed by [Zr(Cp)₂Me][B(C₆F₅)₄] were characterized using in situ NMR. Hyperpolarization of ¹³C spins by the dissolution dynamic nuclear polarization (DNP) technique provided a signal enhancement of up to 5000-fold for these monomers. For DNP hyperpolarization, liquid aliquots containing monomers were prepared at a temperature between the freezing point of the solvent toluene and the boiling point of the monomer, mixed with the polarizing agent α,γ-bis-diphenylene-β-phenylallyl free radical, and subsequently frozen. The hyperpolarized signals after dissolution enabled the observation of reaction kinetics, as well as polymer products and side produ

SUBMITTER: Kim Y 

PROVIDER: S-EPMC8179394 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature