Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR
Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR作者机构:Department of Chemical Engineering Zhejiang University Hangzhou 310027 China FG Technische Physik ll/Polymerphysik Fakultat fiir Mathematik und Naturwissenschaften Technische Universitiit Ilmenau Postfach 100565 D-98684 Ilmenau Germany Institut fiir Technische Chemie und Makromolekulare Chemie RWTH Aachen University Worringerweg 1 D-52056 Aachen Germany
出 版 物:《Chinese Chemical Letters》 (中国化学快报(英文版))
年 卷 期:2008年第19卷第1期
页 面:110-114页
核心收录:
学科分类:081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0703[理学-化学]
基 金:This work was supported by the National Natural Science Foundation of China (No. 20490205 and No. 20406017) CSC-DAAD (PPP2004) project
主 题:Self-diffusion coefficients Pulsed field gradient NMR Tortuosity Polyethylene particle
摘 要:Pulsed field gradient nuclear magnetic resonance (PFG NMR) has been performed to study the diffusion of organic solvents into semicrystalline polyethylene particles. Self-diffusion coefficients in different domains of the sample can be extracted through a bi- exponential fit to the echo intensity attenuation, which allows the precise determination of the tortuosity of the polyethylene particles. Further exploration comes from the measurements with branched polyethylene particles and it was found that the diffusion in polymer phase contributed significantly to the slow component of the exponential decay curve. 2007 Jing Dai Wang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.