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Determination of the chain segment lengths involved in γ relaxation of low‐density polyethylene by thermostimulated depolarization measurements

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2 Author(s)
Audren, P. ; Centre National d’Etudes des Télécommunications, LAB/ROC, B.P. 40, Route de Trégastel, 22301 Lannion, France ; Ronarch, D.

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We determined the chain segment lengths involved in the γ process of low‐density polyethylene by introducing linear alkanes of different chain lengths into the polymer. These alkanes possess at one end of the chain an electric dipole constituted by an ester group. Their influence on the γ relaxation of low‐density polyethylene was observed by thermostimulated depolarization measurements. We found a correlation between the γ temperature peak position and the alkane chain length, while the activation parameters distributions determined by the thermal sampling technique were only slightly modified. This was explained by considering that the distribution in activation parameters is partly induced by a distribution in the chain segment length of the relaxing species. Adding a linear alkane to the polyethylene modifies the population of the mobile chain segments of a given length. We deduced that the γ1 subrelaxation is induced by the motion of chain segments having approximately between 10 and 20 carbon atoms. A compensation law was evidenced in the γ process of all samples studied. The slight modifications of the preexponential factor of relaxation time and the variation of compensation temperature with the alkane chain length are discussed considering a local order in the amorphous phase of low‐density polyethylene.

Published in:

Journal of Applied Physics  (Volume:60 ,  Issue: 3 )

Date of Publication:

Aug 1986

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