8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Fri 911:10-14:00P4.11Molecular transport in liquid polymersHenryk Drozdowski 1 and Zdzislaw Blaszczak 11 A. Mickiewicz University, Faculty of Physics, ul. Umultowska 85, 61-614, Poznań,PolandThe study was performed on low-molecular weight polymers, monochloroalkanes CnH2n-1Cl anddichloroalkanes CnH2nCl2 (where n = 6, 8, 10, 12), whose molecules have a shape of an elongatedellipsoid. The molecules show rotational isomerism. The polymers were subjected to X-raydiffraction study [1] and NMR analysis [2]. Molecular transport in liquid polymers studied was approximatedas relative shifts of hydrocarbon chains [3, 4]. The diffusion coefficients decrease withincreasing molecular weight. The activation energies increase with increasing molecular weight.The experimentally measured values of the self-diffusion coefficient were compared with the theoryof diffusion by Perrin-Agishev [5] and Cohen-Turnbull [6]. Because of supposed role of themethylene chain in mutual configurations of molecules in liquid polymers studied, it seems veryprobable that the Cohen-Turnbull model [7] can also hold for other derivatives of n-alkanes in theliquid phase. References [1] H. Drozdowski (2005). J. Mol. Liquids, 122, 32-37. [2] B. Peplińska,Z. Pajak (1983). Ber. Bunsenges. Phys. Chem. , 87, 693-701. [3] H. Drozdowski (2004). Modelsof the liquids and X-ray diffraction, Scientific Publisher UAM, Poznań. [4] G. Champetier and L.Monnerie (1989). Introduction à la Chimie Macromoléculaire. Masson et Cie Editeurs BoulevardSaint Germain Paris. [5] H. Drozdowski (2004). Phys. Chem. Liquids, 42 (6), 577-584. [6] H.Drozdowski (2003). Phys. Chem. Liquids, 41 (6), 613-622. [7] M. H. Cohen and D. Turnbull(1959). J. Chem. Phys. , 31, 1164-1169.11