Differential scanning calorimetry DSC experiments

Differential scanning calorimetry (DSC) experiments on the various dimeric carbocycles indicated that, depending on the length of the alkyl groups, thermal polymerization had occurred between 100 and 125°C as an abrupt, exothermic process. The narrow temperature range for each exotherm was suggestive of a chain reaction however, IR spectroscopy revealed the absence of acetylene functionalities in the polymerized material. Consequently, none of the substi-... 

Fig. 3. Crystalline evolution of triacylglycerols in fat globules of cream. Three-dimensional plots of small- (A) and wide- (B) angle XRD patterns, recorded simultaneously with differential scanning calorimetry (DSC) experiments during heating of cream at 2 C/min from -8 to 50°C. See Figure 1 for other abbreviation.

Differential Scanning Calorimetry. Differential scanning calorimetry (DSC) experiments were performed using a Perkin-Elmer DSC-7 interfaced with a 7700 series microprocessor/controller. Scans were made on samples weighing 30 mg in the temperature range from room temperature to 340 C at a heating rate of 2O C/min. 

Differential scanning calorimetry (DSC) experiments were utilized to examine the thermodynamic contribution of AF heterogeneity on replication fidelity [79]. Unlike the UV-based data, DSC-derived thermodynamic data are model-... 

Dynamic mechanical and differential scanning calorimetry experiments were used to analyze the BF catalyzed TGDDM-Novalac-DDS system. Dynamic mechanical experiments have been utilized in the past to characterize this epoxy resin (1,2,5,6,7). They have provided information concerning the viscoelastic response of the polymer as well as important morphological information. On the other hand. Differential Scanning Calorimetry (DSC) experiments provide a means for measuring extent of reaction, reaction kinetics and mechanisms of the epoxy system curing process (2). 

Fig. 2 Schematic five types of SMPs depicted as a function of their thermal behavior. Plotted is the heat flow vs temperature as measured in a differential scanning calorimetry (DSC) experiment (a) Cat. A-1, chemically crosslinked tunorphous polymer network (Tirans = 7g) (b) Cat. A-11, chemically ciossfinked semicrystaUine polymer networks (Taims = 7m)> ( ) Cat. B-1, physically crosslinked thermoplastic with Tirans = T (d) Cat. B-11, physically crosslinked thermoplastic (Tams = I m) and (e) liquid crystalline polymer (Tlrans = T -n)...

In order to identify differences in the polymer microstructures, polypropylenes containing similar amounts of isotactic mmmm pentads but prepared with either MAO (A26-A54, Table 9.2) or borate (B29-B51, Table 9.2) cocatalyst have been subjected to further analysis. No comparable differences were found in the samples NMR spectra or in their isotactic block lengths however, WAXS and differential scanning calorimetry (DSC) experiments revealed specific particularities corresponding to each activation method. 

Differential scanning calorimetry (DSC) experiments indicated that atactic polystyrene and polyvinyl methyl ether (PVME) form miscible blends [8,9]. Syndiotactic and isotactic polystyrene when blended with PVME, phase separate at aU temperatures above the glass transition temperature of PVME. Only weak van der Waals interactions between the phenyl rings in polystyrene with the methoxy group of PVME were detected using 2-dimensional nuclear magnetic resonance (NMR) spectroscopy. 

The groimd state energy difference can be used as a predictor for the phase transition temperature as obtained from differential scanning calorimetry (DSC) experiments on... 

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