A theory for the temperature effect on the chain length dependence of the diffusivity of oligomers.
basic_science · Level V
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- Also identified by DOI 10.1039/c9sm02505g.
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Abstract
The effect of temperature on the chain length (N) dependence of the diffusivity of oligomers (with N = 10-60 carbon atoms) was theoretically studied using the free volume theory of Wong and Choi [Soft Matter, 2019, 15, 9300-9309] along with the experimental data of von Meerwall et al. [J. Chem. Phys., 1998, 108, 4299-4304]. Experimental data showed that D<sub>cm</sub>∼N<sup>v</sup> and that becomes less negative as temperature increases but is always stronger than -1 as obtained in the Rouse model. The theory successfully predicts the exponent v as a function of temperature.