Poly thermogram

Fig. 8. DSC thermograms of poly(tetrahydropyran-2,6-diyliminocarbonyl) prepared in DMSO at 19 °C fen 72 hr in 56% yield. Heating rate, 10 °C/min. A, original scanning B, rescanning after scanning up to 290 °cS8)...

An X-ray diffraction study of PHA-10UND= showed that this PHA was amorphous however, the DSC thermogram of the polymer showed a small but clear endotherm at approximately 38 °C. The glass transition temperature of PHA-10UND= is approximately - 46 °C which is significantly lower than those of the poly(nHAMCL)s. Both the melting temperature and the glass transition tempe-... 

Figure 7. DSC thermograms of bis-A-poly sulf one/bis-A-poly carbonate (16,000/17,000) block copolymer after annealing at indicated temperatures for 15 min. Heating rate, 40 K/rhin. Range, 5 meal/sec.

Figure 7.53. Differential scanning calorimetry (DSC). Shown are (a) schematic of the heat-flux sample chamber (b) an example of a DSC thermogram, showing endothermic eventsbDf (c) DSC thermogram of a poly(vinyUdene fluoride)-ethyl acetoacetate polymer-solvent system, showing two melting events for the polymer due to its intermolecular interactions with solvent molecules. The inset shows a comparison between the pure polymer (b) and the polymer-solvent (a). Reproduced with permission from Dasgupta, D. Mahk, S. Thierry, A. Guenet, J. M. Nandi, A. K. Macromolecules 2006, 39,6110.

Figure 4. PDSC thermograms of Gascoyne lignite (—) and poly(4-methoxystyrene) (—). Plot is of heat flux in arbitrary units vs. temperature ( C).

The simplest and most straightforward application of thermal analysis is concerned with studies of the relative stability of polymorphic forms. For example, DTA thermograms enabled the deduction that one commercially available form of chloroquine diphosphate was phase pure, while another consisted of a mixture of two polymorphs. DTA analysis was used to demonstrate that in spite of the fact that different crystal habits of sulfamethazine could be obtained, these in fact consisted of the same anhydrous poly-morph.f In a study aimed at profiling the dissolution behavior of the three polymorphs and five solvates of spironlactone, DTA analysis was used in conjunction with powder X-ray diffraction to establish the character of the various materials. ... 

Figure Thermogram in an inert atmosphere of a poly(ethylene-alt-chloro-trifluoroethylene) sample using a heating rate of tCf C/min.

An example of a TGA curve for one polymer with high decomposition temperature is given for poly(thiophene-2,5-diyl). The thermogram is shown in Figure 15.1.1, and was obtained using heating in air between 30 C and 830 C at a rate of 10 C/min. 

Thermal decomposition of poly(3-hexylthiophene-2,5-diyl) is described by its TGA curve shown in Figure 15.1.3. The thermogram was obtained from a sample with M = 87,000 in air, by heating between 30° C and 830° C at a rate of 10° C/min. 

FIGURE 10.8 DSC thermogram of poly(2,5-didecyloxy-l,4-phenylenebutadiyny-lene). 

Figure 15. DSC thermogram of star-branched poly(ethylene-co-l-butene) ionomer, K salt (SBD-1). 1-Butene content = 8 mole %.

Fig. 18. Thermograms of the poly(BACY) and IPNs in argon. Heating rate 10 °C/min...

Fig. 36. TVA thermogram of poly(n-propyl acrylate) at various trap temperatures (—-----) Oand —45°C (--) —75 and —100°C [113],...

Figure 14.5. DSC thermograms for aged polymer blends (a) polyvinylchloride/poly isopropyl methacrylate, immiscible blend, aged at a temperature of 60°C, and (b) polyvinyl chloride/polymethylmethacrylate, miscible blend, aged at 80°C. Time of aging, t in hours, is shown alongside each curve. Broken lines represent the un-aged samples for comparison.

FIGURE 10. Temperature dependences of reflectivity for poly(C4UC4) crystal at 1.94eV and DSC thermograms. Reproduced by permission of the American Institute of Physics... 

A differential scanning calorimetry (DSC) thermogram of poly(l,6-heptadiyne) showed two irreversible... 

The isomerization temperature of linear polyacetylene is reported as 155 The higher temperature process is assumed to be due to the exo to endo rearrangement and/or the thermal decomposition reaction. Poly(l,6-heptadiyne) homologues also showed similar two exothermic peaks in the DSC thermogram, as shown in Table 14. 

In toluene solution, syndiotactic block copolymers of methyl methacrylate (PMMA) and allyl methacrylate were formed using triphenylphosphine and triethylaluminum as initiator [76]. In acetone solution, syndiotactic poly(methyl methacrylate) forms a stereocomplex with other syndiotactic polymers. The complex formed with syndiotactic poly(allyl methacrylate), upon separation from the reaction mixture and drying had a melting point of 141.5°C by DSC thermogram. From X-ray powder patterns of this and related complexes of PMMA with other polymethacrylates, the authors postulate that a double-stranded helix may represent a model of the structure of these complexes [77]. 

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