Applications of DMTA to polymers

3°C at a scanning rate of only 2°C/min. Any expected resolution enchancement will be spoilt by lack of temperature precision, unless exceptionally slow rates are used. Lost peak locations for common commercial polymers have been listed elsewhere [11]..  

The so-called WLF (Williams, Landel and Ferry) [13] time-temperature superposition principle and the working relation derived from it give a better 

Dynamic measurements through the melting region of polymers can only be achieved with difficulty and require parallel-plate, simple-shear, or torsion geometry. Polyethylene shows at least two, if not three transitions [14, 15] which depend on polymer type (linear, linear low, etc.). Poly(chlorotrifluoro-ethylene) has also been studied in detail [16]. In reality these data are all related to the lamellar structures formed in these systems. Poly(ethylene oxide) also exhibits loss peaks through the melting region, but their amplitude has been observed to be strain-dependent. The polymer is non-linear viscoelastic, and quantification of the measurements is difficult. This probably applies to most ac relaxations. 

1 Hz are gelation and then vitrification. The sample appears to have reached its final cure at 100 Hz before that at low frequencies, because once again it is the kinetics of the molecules which are being probed. These cure processes can well be considered as driving the system into the glassy state by chemical reaction. 

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