Book contents
- Frontmatter
- Contents
- Preface
- 1 Chemistry and structure of reactive polymers
- 2 Physics and dynamics of reactive polymers
- 3 Chemical and physical analyses for reactive polymers
- 4 Chemorheological techniques for reactive polymers
- 5 Chemorheology and chemorheological modelling
- 6 Industrial technologies, chemorheological modelling and process modelling for processing reactive polymers
- Glossary of commonly used terms
- Index
4 - Chemorheological techniques for reactive polymers
Published online by Cambridge University Press: 14 August 2009
- Frontmatter
- Contents
- Preface
- 1 Chemistry and structure of reactive polymers
- 2 Physics and dynamics of reactive polymers
- 3 Chemical and physical analyses for reactive polymers
- 4 Chemorheological techniques for reactive polymers
- 5 Chemorheology and chemorheological modelling
- 6 Industrial technologies, chemorheological modelling and process modelling for processing reactive polymers
- Glossary of commonly used terms
- Index
Summary
Introduction
This chapter highlights the importance of chemorheology in determining cure properties of reactive systems. A brief introduction to experimental rheology has been provided in Chapter 3 to provide a baseline knowledge of experimental rheology. In this chapter we examine a description of chemorheology in terms of basic chemorheology, chemoviscosity, gelation and vitrification transitions and ultimate properties. Finally, examples of chemorheological analysis will be discussed. (We will briefly summarize chemorheological data and models in this chapter, but only for reference to chemorheological testing. A more extensive examination of chemorheology and modelling of systems will be presented in Chapter 5.)
Chemorheology
The definition of chemorheology (in this text) is the study of the deformation properties of reactive polymer systems. Figure 4.1 shows a schematic representation of the structural development during thermoset cure.
Step (a) shows unreacted monomers, and cure proceeds to step (b), at which there is the formation of some branched molecules. By step (c) the cure has progressed to the gel point, such that an infinite network is formed across the whole structure. Further cure can occur to point (d), at which the material becomes fully cured and vitrification is reached.
The essential elements of a chemorheological study are
fundamental chemorheology
chemoviscosity profiles
gelation
vitrification
ultimate chemorheological properties
modelling
We shall focus on modelling in Chapter 5.
- Type
- Chapter
- Information
- Chemorheology of PolymersFrom Fundamental Principles to Reactive Processing, pp. 321 - 350Publisher: Cambridge University PressPrint publication year: 2009