title: Generic applications of (13) C-detected NMR diffusion to formulated systems with suppression of thermal convection induced by proton decoupling.
abstract: Fast and effective structural/compositional analysis on formulated systems represents one of the major challenges encountered in analytical science. (13) C-detected diffusion represents a promising tool to tackle the aforementioned challenges, particularly in industry. Toward exploring the generic applications of (13) C-detected diffusion, thermal convection induced by (1) H decoupling has been identified as a key factor that resulted in significantly reduced resolution in the diffusion dimension. Optimization of experimental parameters and utilization of double-stimulated echo-based pulse sequence both can effectively suppress the thermal convection caused by the (1) H decoupling, the success of which allows robust and generic applications of (13) C-detected diffusion to systems from mixtures of small molecules, polymer blends, and copolymers to actual complex formulated systems. The method is particularly powerful in differentiating small molecules from polymers, polymer blends from copolymers, and end-group analysis. Copyright © 2016 John Wiley & Sons, Ltd.
authors: Corporate R&D, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA.
authors: Jianbo
authors: J
authors: Hou
authors: Corporate R&D, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA.
authors: Yiyong
authors: Y
authors: He
authors: Analytical Technology Center, Dow Benelux B.V., 446 Building, 4530 AA, Terneuzen, the Netherlands.
authors: Paolo
authors: P
authors: Sabatino
authors: Corporate R&D, The Dow Chemical Company, 936 Zhangheng Rd, Shanghai, 201203, China.
authors: Ling
authors: L
authors: Yuan
authors: Corporate R&D, The Dow Chemical Company, 1897 Building, Midland, MI, 48667, USA.
authors: David
authors: D
authors: Redwine
keywords: 13C; NMR; diffusion; end-group analysis; formulated system; polymer blends; thermal convection