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| Content Provider | Springer Nature Link |
|---|---|
| Author | Cser, F. Rasoul, F. Kosior, E. |
| Copyright Year | 1997 |
| Abstract | The reproducibility and reliability of the TA Instruments Modulated Differential Scanning Calorimeter (MDSC) was tested over a range of conditions. The equipment base line was found to be fairly constant with a very small fluctuation (10 μW), which means a 0.1 % fluctuation on the scale of a normal polymer MDSC curve. The excellent stability of the base line and the reasonable reproducibility of the curves (5%) suggest that frequent calibration is not required.The heat capacities calculated from the modulated response to the variable temperature depend on the frequency for a given cell constant. The heat capacity cell constant is a unique function of the modulation frequency:k $_{c}$=K co p/(p−6.3) wherep is the time of the periodicity expressed in seconds and Kco is the heat capacity cell constant measured on a standard material and reduced to zero frequency. The cell constants depend on the flow rate of the helium according to:K(He)=K $^{o}$(1.298−0.004424He+1.438·10$^{−5}$ He $^{2}$) whereHe is the flow rate of helium in ml min$^{−1}$ andK $^{o}$ represents a constant at 100 cm$^{3}$ min$^{−1}$. There is a strong dependence of cell constant on the flow rate ranges from 10 to 80 cm$^{3}$ min$^{−1}$, while above this rate (up to 135 ml min$^{−1}$) the cell constant approaches a plateau. |
| Starting Page | 727 |
| Ending Page | 744 |
| Page Count | 18 |
| File Format | |
| ISSN | 00225215 |
| Journal | Journal of thermal analysis |
| Volume Number | 50 |
| Issue Number | 5-6 |
| e-ISSN | 15728943 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 1997-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | frequency dependence heat capacity MDSC thermal analyses Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation |
| Content Type | Text |
| Resource Type | Article |
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