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453 Figure 9. Dependence of sizes R of the positron-sensitive microcavity on time of exposure tc at 25°C for PTMSP 53 The result observed is connected with slow structural relaxation but not the ‘aging’ (if by the ‘aging’ occurrence of the main chain fission is meant), because the latter process is usually accompanied by changes in intensity ID (results of observing long-term aging of polyethylene by the method of positron lifetime variation may be displayed as an example, although ‘aging’ in polymers is a very specific process).

To demonstrate this experimental fact more clearly, Figure 6 displays the dependence of density ρ of various polymers on the relation M N A ∑ ∆Vi . 726 C O O SO 2 —CH2—CH2— CH2 CH CH3 CH2 CH2 CH NH C O (CH2)4 O C NH O O Figure 6. Dependence of density ρ on ∑ ∆' L L the values of ρ determined experimentally fit well the same linear dependence on the relation of atoms mass on their volume. 5), the tangent of this straight line represents the molecular packing coefficient which, in the case of amorphous bulky systems, serves as an universal constant.

726 C O O SO 2 —CH2—CH2— CH2 CH CH3 CH2 CH2 CH NH C O (CH2)4 O C NH O O Figure 6. Dependence of density ρ on ∑ ∆' L L the values of ρ determined experimentally fit well the same linear dependence on the relation of atoms mass on their volume. 5), the tangent of this straight line represents the molecular packing coefficient which, in the case of amorphous bulky systems, serves as an universal constant. 5) under the condition kavg = const. 681. 603. Hence, a change of the polymer chemical structure is unable to cause a significant effect on the part of the occupied volume in amorphous polymeric substance, and the value of density, ρ, itself depends on the relation of mass and the Van-der-Walls volume of the repeat unit only.

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