Thermally induced disentanglement

These transitions in the deformation character can be imderstood by processes on the macromolecular level. With increasing temperature, the stress necessary for thermally induced disentanglement drops more rapidly than the stress necessary for molecular mobility (yield stress). There are three regions depending on temperature of deformation ... 

T < Tg (T Tg) Intense thermally induced disentanglement (lower disentanglement stress than yield stress) results in coarsening of craze structure with increasing fibril thickness and fibril spacing. 

AT= Tg- T larger than 80 K) is connected with homogeneous deformation bands with higher deformation temperatures below Tg an effect of a thermally Induced disentanglement occurs, which creates fibrillated crazes [3, 12, 13] ... 

Eqs. (1) to (3) indicate that conversion studies under conditions where thermal polymerization prevails can only yield e and the product nyo, whereas the photon-induced reaction provides information on the product nq. To disentangle chain initiation and chain propagation effects an independent determination of the kinetic chain length is required. 

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