Differential scanning calorimetry analysis

From the endothermic transition energy, HER-HP extension produced a higher hard segment content compared to the other TG materials. 

1 Effect of Whiskers Reinforcement on Nanocomposite Melting Behavior 

As the percentage of reinforcement increases, both matrix crystallinity and heat of fusion slightly decrease, while melting temperatures remain steady and constant. The addition of kenaf whiskers into the matrix did not seem to have any effect on CAB recrystallization. 

In this study, glass transition temperature [Tg) values of KL and LGC were estimated using Perkin Elmer model Pyres 1 DSC. 

Approximately 10 mg of sample was heated from -50 to 180°C at the heating rate of 20°C/min in a nitrogen atmosphere at the flow rate of 30 mL/min. 

The thermal properties of ungrafted KL and LGC were studied using the DSC analysis. The KL is an amorphous compound with Tg at 58.03°C, as illustrated by DSC thermogram in Fig. 4.10. The amorphousity of the KL may be due to the complication in its structure which somewhat impedes the occurrence of an arrangement in its composition. Therefore, no melting temperature Tn, or crystallization temperature has been recorded in the DSC thermogram. 

As free volume increases, the Tg temperature tends to decrease (Pticek et al., 2005). The above-mentioned explanation investigated 

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In another study, thermodiffractometry was used to study phase transformations in mannitol and paracetamol, as well as the desolvation of lactose monohydrate and the dioxane solvatomorph of paracetamol [56]. The authors noted that in order to obtain the best data, the heating cycle must be sufficiently slow to permit the thermally induced reactions to reach completion. At the same time, the use of overly long cycle times can yield sample decomposition. In addition, the sample conditions are bound to differ relative to the conditions used for a differential scanning calorimetry analysis, so one should expect some differences in thermal profiles when comparing data from analogous studies. 

The hydrolyses of all the propellants tested (M1, M8, and M28) formed some solid residue, the analysis of which was not pursued. However, differential scanning calorimetry analysis showed no significant exotherms in the thermograms of the residues from any of the propellants. 

Differential Scanning Calorimetry Analysis of the Thermal Curing of a,(O-bis (vinylbenzyl)PSU. Typical DSC curves for a,W-bis (hydroxyphenyl)-PSU and a,w-bis(vinylbenzyl)PSU are presented in Figure 4. The... 

Flandin F, Buffevant C and Herbage D (1984) A differential scanning calorimetry analysis of the age-related changes in the thermal stability of rat skin collagen. Biochim Biophys Acta 791, 205-211. 

The new ILs, submitted to differential scanning calorimetry analysis, showed glass-transition temperatures ranging from —36°C (47c) to +18°C (47a). All the ionic liquids prepared were stable compounds that did not undergo hydrolysis of the anomeric C-N bond upon prolonged storage at room temperature. Moreover, their... 

Differential scanning calorimetry analysis. The KL-containing PU s from... 

S.A Shackelford, I.W. Beckmann, .S. Wilkes, Deuterium Isotope Effects In Thermal Decompositbn of Liquid 2,4,6-Trinirotobene AppEcation to Mechanistic Studies Using Isothermal Differential Scanning Calorimetry Analysis, . Org. Chem., 42 (1977) 4201. 

Figure 3. Differential scanning calorimetry analysis on the t-BOC protected copolymer. The endotherm at 152° on the first heating is associated with thermolysis of the t-BOC group. The second heating shows a Tg for the deprotected, phenolic copolymer at 235°.

Burfield, D. R. and K. L. Ldm, Differential scanning calorimetry analysis of natural rubber and related polyisoprenes. Measurement of the glass transition temperature. Macromolecules, 16, 7, 1170-1175, 1983. 

Behme, R.J. Brooke, D. Heat of fusion measurement of a low melting polymorph of carbamazepine that undergoes multiple-phase changes during differential scanning calorimetry analysis. J. Pharm. Sci. 1991, 80 (10), 986-990. 

Fig. 1. Differential Scanning Calorimetry analysis (DSC) of oligo-dimethylsiloxanediol (5).

A typical graph of differential scanning calorimetry analysis of a dimethylsiloxane pol)mier with higher viscosity (350 cSt) is shown in Fig. 2. The glass transition is observed at -127.9 °C, the cold crystallization at -96.5 °C, and melting transitions at -51.7 and -38.3 °C, respectively. 

Behme ly and Brooke D. Heat of Fusion Measurement of a Low Melting Polymorph of Carbamazepine that Undergoes Multiple-Phase Changes During Differential Scanning Calorimetry Analysis./PAarro Sci 1991 80 986—990. 

Differential scanning calorimetry analysis indicated the presence of a major endothermic peak around 0°C during heating (Figure 31.2a) in all the samples analyzed. Such a peak was primarily attributed to ice melting in the sample. The shape of the 0°C peak was quite symmetrical with the samples of low starch content (up to 10% s/w) produced by HP, T, or HP-T. At higher starch concentrations the 0°C endothermic peak maintained a symmetrical shape (although not Lorentian) with the gel-T while with the gel-HP and... 

For systems of rigid poly diacetylenes with functional or ionic side groups and car-boxylated or sulfonated polystyrene or sulfonated polyester-urea urethanes, molecular composites could be achieved by ionic interactions [51]. The blends exhibited no microphase separation and the miscibility on a molecular length scale was proven by infrared spectroscopic, dynamic mechanical and differential scanning calorimetry analysis. The molecular reinforcement amounted to up to 1 order of magnitude in compliance with a Halpin Tsai description and was achieved by only a few weight percent of the rigid compound. 

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