Analog calorimetry

Analog calorimetry Anionic polymerization Anisometric particles Anisometric properties Annealing... 

The infortnation provided in this chapter can be divided into four parts 1. introduction, 2. thermodynamic theories of polymer blends, 3. characteristic thermodynamic parameters for polymer blends, and 4. experimental methods. The introduction presents the basic principles of the classical equilibrium thermodynamics, describes behavior of the single-component materials, and then focuses on the two-component systems solutions and polymer blends. The main focus of the second part is on the theories (and experimental parameters related to them) for the thermodynamic behavior of polymer blends. Several theoretical approaches are presented, starting with the classical Flory-Huggins lattice theory and, those evolving from it, solubility parameter and analog calorimetry approaches. Also, equation of state (EoS) types of theories were summarized. Finally, descriptions based on the atomistic considerations, in particular the polymer reference interaction site model (PRISM), were briefly outlined. 

This approach was applied to experimental data of analog compounds of PVC and poly(meth)acrylates as shown in Fig. 2.11. The specific interaction AHm was assumed proportional to the C=0 concentration. The experimental heat of mixing was determined via analog calorimetry. The predicted AHm illustrates a window of miscibility between C=0 values of 0.1 and 0.32 weight fraction (for the poly(meth)acrylates) in the range of observed experimental results on analog compounds and also low molecular weight polymer blends. 

Figure 2.15 Window of miscibility for EA-AA copolymer blends with VAE copolymers (experimentaland predicted with model compound analog calorimetry)(reproduced (replotted) from Bott, R. H., Kuphal, J. A., Robeson, L. M. and SagI, D., J. Appl. Polym. Sci. (1995) 58, p. 1593, with...

Reviews of calorimetric characterization of polymer blends include [31] (differential scanning calorimetry) and [42] (analog calorimetry). General review of thermal analysis of polymers (including calorimetric methods) include [43, 44]. 

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