Perkin Elmer DSC

DSC Calorimetry was done in a Perkin-Elmer DSC II at a scan rate of 20°C/min. The scale used is 2mcal/sec. full scale. Sample weight was 12" 20 mg. with an empty sample pan as reference. 

Differential Scanning Calorimeter (DSC) thermograms were obtained on a Perkin Elmer DSC-2 run at 10°C per minutes. Dynamic Mechanical Thermal Analysis (DMTA) spectra were obtained on a Polymer Labs DMTA at a frequency of 1Hz with a temperature range from -150°C to +150°C at a scan rate of 5°C per minute. 

Thermal analysis was performed with a Perkin-Elmer DSC-4... 

Three EPDM samples were chosen, two containing 5-ethylidene-2-norbornene as the diene monomer, viz. samples D and K with 1.0 and 2.5 mol % respectively, and one, viz. sample N, comprising 1.0 mol % 1,4-hexadiene. Sample D contained 58 mol % ethylene, K and N both 65, and their Mjj was 65 kg/mol. Measurements with a Perkin Elmer DSC-2 confirmed that the K and N samples were amorphous at T > 283 K, whereas sample D was amorphous at T ) 240 K. 

The DSC thermogram of bromocriptine mesilate, obtained with a Perkin Elmer DSC-2 instrument at a heating rate of 20 °C/min. and in a nitrogen atmosphere, is shown in fig. 9. 

A DSC scan for nalidixic acid was performed by Houghtaling.(9) The instrument used was a Perkin-Elmer DSC-1B at a scan rate of l°/min. The curve is presented in Figure 7. A sharp peak at 229-230.5° (corr) represents the sample melting. 

The DSC curve of pseudoephedrine hydrochloride obtained with a Perkin Elmer DSC-1B differential scanning calorimeter is shown in Figure 5.7 The heating rate was 5°C/min. The heat of fusion is 6.4 Kcal/mol. The melting point (uncorrected) is 184°C. 

A Perkin-Elmer DSC-7 was used for thermal characterization of the starting phenolic resins and copolymers prepared. Scans were run at 10"C/min using sample weights of 15-25 mg. In all cases the amorphous, powdered polymers were used for the evaluation. 

GPC measurements were used to demonstrate that a monomodal molecular weight distribution with a polydispersity of approximately 2 was obtained. The glass transition temperature was determined on a Perkin-Elmer DSC-2 using a heating rate of 10 C/min and the intrinsic viscosity was determined in NMP at 25°C. These data are summarized in Table I. 

A Perkin-Elmer DSC-7 machine was used for these measurements. (Tm and Tg, respectively). Determinations were performed in a N2 atmosphere at a heating rate of 20 °C/min. 

Isothermal DSC measurements were made with a Perkin Elmer DSC-2C apparatus, modified for UV irradiation (Figure 1). The aluminum sample holder enclosure cover contains two windows, one for the sample and one for the reference compartment. The windows consist of cylindrical quartz cuvettes which have been evacuated in order to prevent moisture condensation. The windows were mounted by using a thermally cured epoxy adhesive. 

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. 

The glass transition (Ta) and melting (Tm) temperature of the pure component polymers and their blends were determined on a Perkin-Elmer (DSC-4) differential scanning calorimeter and Thermal Analysis Data Station (TADS). All materials were analyzed at a heating and cooling rate of 20°C min-1 under a purge of dry nitrogen. Dynamic mechanical properties were determined with a Polymer Laboratories, Inc. dynamic mechanical thermal analyzer interfaced to a Hewlett-Packard microcomputer. The... 

Instrumentation. UV/Visible spectra were collected on a Perkin-Elmer Lambda 4 spectrophotometer. IR spectra were collected on a Perkin-Elmer 1640 spectrophotometer. NMR spectra were taken on a Nicolet NT-200 spectrometer. Differential scanning calorimetry was run on a Perkin-Elmer DSC-4 unit, equipped with a system 4 microprocessor controller and a 3600 data station. Elemental analyses were run by the Purdue microanalysis laboratory in the Department of Chemistry at Purdue University and by Huffman Labs (Golden, CO). Lignin group analysis techniques are described in references 19-21. 

Molecular weight was determined using gel permeation chromatography (GPC, Waters Millipore). The glass transition temperatures (7g) were analysed using differential scanning calorimetry (Perkin-Elmer DSC-2). 

A series of hexafluoro-isopropylidene-containing polyimides were synthesized using solution polycondensation reactions and then chemically imidized [23-25]. Table 7 shows their chemical compositions Fig. 12 shows the monomer structures. The glass transition temperatures, Mw and Mn, of these polyimides are summarized in Table 8. A Perkin-Elmer DSC was used to determine these Tgs with a heating rate of 20 °C/min. All Tgs were measured at the second heating. 

Figure 9. Scans of synthetic phospholipids in water taken with a Perkin-Elmer DSC IB differential scanning calorimeter. Lipid concentrations were 10-15% by weight...

Glass transition temperatures were determined using a Perkin-Elmer DSC-II or DSC-IV at a heating rate of 10 °C/min. Several scans were run at 20 °C/min on a DSC-IV to gain information on the breadth of the glass transition region. 

Fig. 1. Power Compensation DSC. Schematic Cross-Section of Perkin-Elmer DSC Cell. (Reproduces from Thermal Analysis Newsletter, Perkin-Elmer Corp., No. 9 (1970))...

Fig. 22. Scanning differential calorimeter trace of heating (top) and cooling (bottom) of a melt crystallized trans-1,4-polybutadiene (Drawn after Ref.14S), Perkin-Elmer DSC, unspecified heating and cooling rates)...

NMR spectra were taken in deuteriochloroform solution, using a Varian HA100 spectrometer. Thermal measurements were made with a Perkin-Elmer DSC IB differential scanning calorimeter at 40°C/min. Near-infrared spectra were measured in carbon disulfide solution with a Beckman DK 2A spectrophotometer. Gas-chromatographic analyses of reaction mixtures were carried out after conversion of the phenols to trimethylsilyl ethers by reaction with bis (trimethylsilyl) acetamide. 

Calorimetric measurements were made using a Perkin-Elmer DSC-1B differential scanning calorimeter. A uniform heating rate of 10 °C per minute was employed for all measurements. 

Thermal Analysis Measurements. DSC scans at 40°C/min were obtained on a Perkin-Elmer DSC-2. Dried copolymer powder was used. In situ annealing treatments were applied as discussal below by programming the desired temperature profiles on the instrument. 

A Perkin-Elmer DSC-2 differential scanning calorimeter equipped with an Automatic Scanning Zero was used. DSC conditions were 20 K/min on a 20.8-mW sensitivity with a 24-mg aluminum reference. 

Most commercial DTA and DSC models are patterned after those shown in the figures. Representative commercially available models include Perkin-Elmer DSC 7 and DTA 1700, TA Instruments 2910 DSC and DTA, Mettler TC11/... 

The relative amounts of crystalline and dissolved sulfur as determined by a Perkin Elmer DSC-1B is depicted in a block diagram, Figure 2. An investigation of ageing characteristics and stability of the noncrystalline portion of the SA binder with three grades of paving asphalts at four levels of sulfur concentration indicates that the amount of dis-... 

Differential scanning colorimeter, Perkin-Elmer DSC-1B, was used to deter-... 

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