Citation: Xiao Wei Yan, Xiao Hong Ren, Siegfried Stapf, Jing Dai Wang, Yong Rong Yang. Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR[J]. Chinese Chemical Letters, ;2008, 19(1): 110-114. doi: 10.1016/j.cclet.2007.10.034 shu

Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR

a Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China;
b FG Technische Physik Ⅱ/Polymerphysik, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Postfach 100565, D-98684 Ilmenau, Germany;
c Institut für Technische Chemie und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, D-52056 Aachen, Germany

Received Date: 26 June 2007

Fund Project: This work was supported by the National Natural Science Foundation of China(No.20490205 and No.20406017) and CSC-DAAD(PPP2004) project.

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.
- Self-diffusion coefficients,
- Pulsed field gradient NMR,
- Tortuosity,
- Polyethylene particle
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