Calorimetric analyses

Figure 2. Differential scanning calorimetric analysis of a cobalt chloride modified BDSDA-ODA polyimide film.

Possible determinations from DSC or DTA measurements include (1) heat of transition, (2) heat of reaction, (3) sample purity, (4) phase diagram, (5) specific heat, (6) sample identification, (7) percentage incorporation of a substance, (8) reaction rate, (9) rate of crystallization or melting, (10) solvent retention, and (11) activation energy. Thus, thermo-calorimetric analysis can be a useful tool in describing the chemical and physical relationship of a polymer with respect to temperature. 

A brief description of calorimetric analysis of adsorption follows in Section 9.6. 

Provenzano, M. R., Ouatmane, A., HaAdi, M., and Senesi, N. (2000). Differential scanning calorimetric analysis of composted materials from different sources. J. Therm. Anal. Calorim. 61(2), 607-614. 

Fig. 24 Magnetic susceptibility for BABI at 10,000 Oe external field. A-D represent fits to the experimental data (A) square planar AFM system with J/k = — 1.6 K (B) square planar bilayer AFM system with J2olk = —1.4 K and interlayer Jik = —1.3 K (C) AFM spin pairing with Jjk = —3.8 K C is same model as C, with Jik = — 2.4 K D is same model as B, with J2T>lk = — 1.2K and interlayer Jik = — 1.9K (from calorimetric analysis).

Fig-i- Micro-thermistorarray with immobilized enzymes for calorimetric analysis T,... Thermistors, E ... Enzyme columns... 

The impact of the nanocomposite technology on polymers is huge, reflected in enhanced properties of the resulting PNs, such as enhanced mechanical, barrier, solvent-resistant, and ablation properties.12 The effect of nanocomposite technology on the thermal and fire performance of the polymers is primarily observed in two important parameters of the polymers (1) the onset temperature (7( ,nsct) in the thermogravimetric analysis (TGA) curve—representative of the thermal stability of the polymer, and (2) the peak heat release rate (peak HRR) in cone calorimetric analysis (CCA)—a reflection of the combustion behavior (the flammability) of the polymer. The Tonset will be increased and the peak HRR will be reduced for a variety of polymers when nanoscale dispersion of the nanoadditive is achieved in the polymer matrix. 

Najafi-Mohajeri, N. Jayakody, C Nelson, G.L. Cone calorimetric analysis of modified polyurethane elastomers and foams with flame-retardant additives. In Fire and Polymers. Materials and Solutions for Hazard Prevention, Nelson, G.L., Wilkie, C.A., Eds. ACS Symposium Series 797 American Chemical Society Washington, 2001 pp. 79-89. 

Sleigh SH, Seavers PR, Wilkinson AJ, Ladbury LE, Tame JRH. Crystallographic and calorimetric analysis of peptide binding to OppA protein. J. Mol. Biol. 1999 291 393 15. 

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