Cooling runs, scanning calorimetry

Figures la and lb. Differential Scanning Calorimetry Results of the Second Cooling Runs for (a) Solution Blended and (b) Extrusion Blended PLA/EVAc Homopolymers and Copolymers.

Differential scanning calorimetry (DSC). The DSC analyses were carried out using a Perkin-Elmer DSC-7 and a DuPont 910DSC. Tg was defined as the midpoint of the change in heat capacity occurring over the transition. The samples were first scanned to 95°C, thereafter cooled and recorded a second time. The Tg was determined from the second run. The measurements were carried out under an atmosphere of dry nitrogen at a heating rate of 10°C/min. 

Figure 2 Differential scanning calorimetry results (cooling) for a sample of runny cream and thick cream. Run conditions sample mass 13.0 mg, cooling rate 10°C/min, sealed aluminum pans.

Fig. 12 (a) Reduced temperature T — 7]SO/bp vs xcdSe phase diagram for CE8 + CdSe mixtures obtained from cooling runs by a.c. colorimetry. Ti-bpiii was found to be a weak function of x. (b) T — rIso/BP vs xcdse plot for CE6 + CdSe mixtures obtained from heating runs by adiabatic scanning calorimetry. For clarity the data in both diagrams are plotted vs the Ti-bpiii [428]. (Copyright 2010, The American Physical Society)... 

Thermal Analysis Glass transition temperatures, Tg s, were obtained by differential scanning calorimetry on a Seiko DSC 210. Scans were run at 10 C per minute and the reported values were obtained from a second heating after quick cooling. The thermooxidative stability was determined by thermogravimetric analysis in air on a Perkin-Elmer TGA-7 at 10 /minute heating rate. 

Differential scanning calorimetry was performed using a Perkin-Elmer DSC-2. Scans were run at 20K/minute with a sensitivity of 5 mcal/sec. Tg values were recorded for the second scan of powdered samples after heating and then cooling at 320 /minute Tm data were taken as the peak of the melting endotherm observed during the first scan. 

Figure 14.1 Differential scanning calorimetry of binary blends of polystyrene and tetramethyl bisphenol-A-polycarbonate. (a) DSC of various blends between 100% polystyrene (lower curve) and 100% tetramethyl bisphenol-A-polycarbonate (upper curve). Heating rate 20 °C/min. (b) 1 1 mixture of polystyrene tetramethyl bisphenol-A-polycarbonate, preheated to stated temperature (230-270 °C) then cooled in ice prior to DSC run Reprinted from K,H. liters, W, Hickman and /. Hambrecht, Journal of Colloid and Polymer Science, 1984, 262, 557, with permission from Springer [25])...

Figure 4. Thermal properties of aliphatic polycarbonates poly(propylene carbonate) (PPC) poly(l,2-butylene carbonate) (PBC) poly(l,2-hex-5-ene carbonate) (PHC) poly(styrene carbonate) (PSC). (a) Thermogravimetric analysis curves (samples were run under an N2 atmosphere with a heating rate of 20 °C/min). (b) Differential scanning calorimetry curves (samples were run under an N2 atmosphere with a heating and cooling rate of 10 °C/min data...

Differential scanning calorimetry (DSC) was performed on the polymers, tridecamer, and the blend using a Perkin Elmer DSC 7 with an ethylene glycol cooling system maintained at 15 C. The runs were made... 

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