Fundamental chemorheology

We shall focus on modelling in Chapter 5. This chapter will focus on the other chemorheological properties and use examples from the literature to clarily key points. 

Many chemorheological studies omit what we have termed fundamental chemorheological behaviour, by which we mean the basic tests that can assess the fundamental rheological 

Here it can be seen that the response is highly non-linear since the dynamic viscosity is dependent on the strain amplitude. Thus any further testing assuming linear viscoelastic behaviour is not possible for this system under these conditions. 

The investigation of non-linear behaviour is an active field for many other polymer systems. For example Payne (1962) interpreted a maximum in G (with respect to strain) in the non-linear behaviour of filled suspensions, which has been denoted the Payne effect. Maier and Goritz (1996) and Wilhelm et al. (2000) examined the use of Fourier-transform analysis of non-sinusoidal waveforms produced by materials exhibiting non-linear behaviour. This concept of using Fourier-transform rheology to characterize the non-linear 

It should be noted that the linear viscoelastic behaviour needs to be examined as a function of temperature and cure level during the reaction in order to describe fully the viscoelastic behaviour of the system. 

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Overall these fundamental chemorheological tests will provide essential characterization of the typically complex reactive systems under investigation. As mentioned previously, to achieve full characterization we are next interested in chemoviscosity profiles. 

Although this book is intended to address the chemorheology and reactive processing of polymers, the chemical reactions in the melt phase (e.g. branching reactions, degradation) may affect the subsequent solid-state and performance properties of the polymer. Furthermore, the end product of the reactive processing is the solid polymer and the transformation process from the liquid to the solid state of a polymer is fundamental to the success of the processing operation. It is therefore important to examine the way the polymer achieves its solid-state properties, and one of the most important properties... 

The aim of this book is not to discuss each of these reactive modification techniques in detail, but rather to show how chemorheology can be a useful tool from fundamental understandings to understanding processing, process control and optimization. 

Chemorheology of Polymers From Fundamental Principles to Reactive Processing... 

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