Thermal weight loss

The vacuum-thermal weight loss results presented in Figure 3 show a two-step weight loss pattern for the irradiated sample. Weight loss associated with volatilization of the first product begins before 100°C and the second near 150°C. No weight loss was observed below 225°C for the nonirradiated composite sample. 

TABLE 4.3 Thermal Weight Loss, Weight Percent, of Nadic Methyl Anhydride Cured Epoxy Novolac Resin (Cured 2 h at 90°C, 4 h at 165°C, and 16 h at 200°C)4... 

Experimental Section. The samples used in the TGA study were crushed to minus 200 mesh. Noniso thermal weight loss data were gathered using a DuPont 951 thermogravimetric balance with a DuPont 990 thermal analyzer. 

High electric-field strength Low solubility in H2O Low shrinkage Low thermal weight loss... 

KHSi205 was prepared by a new method to be described elsewhere. The X-ray diffraction pattern, thermal weight loss behavior, and 29si and NMR spectra are consistent with the data reported in the literature, except where reported below (3-6). 

Park and co-workers [36] used PAI-polydimethylsiloxane nanocomposites and characterised the mechanical, surface and thermal properties of these nanocomposite films. Elongation and toughness of these Aims was increased relative to the PAI but the tensile strength was decreased. Thermal properties showed a greater thermal weight loss initially, but char concentration in an oxygen atmosphere at 100 °C was increased. 

The surface characteristics of modified whiskers can be analyzed by detecting the thermal weight loss curve. Figure 3.21 shows the thermal gravimetric analysis (TGA) curve of potassium titanate whiskers modified with PMMA. 

The thermogravimetric curves of pure PP and PP filled with different amounts of calcium carbonate whiskers are shown in Figure 6.13, and the thermal decomposition temperature data at 5% thermal weight loss are listed in Table 6.3. 

Note Tjj is the corresponding temperature at 5% thermal weight loss. 

As can be seen from Table 6.8, at 5% thermal weight loss, the thermal decomposition temperatures of composites increase significantly with increasing filling content of calcium carbonate whiskers. The largest thermal decomposition temperature reached is 409.5°C at 15% filling content, indicating that the thermal decomposition temperature of PP material increases and thermal stability is improved with the addition of calcium carbonate whiskers. 

Yang et al. [245] have used TG for the study of the thermal weight loss of low-MW surfactants, used as antistatic agents in HDPE containers. In a typical example of product development Ward et al. [246] have reported the use of TG in combination with static decay and optical measurements for evaluation of the effectiveness of some 13 internal antistatics. With fail/pass criteria of a weight loss of 5% (up to 250°C) and a static decay time of less than 0.5 s at 70% r.h., none of the commercially available surfactants did meet all critical criteria developmental PMMA antistats were reported. 

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