| Some Remarks on the Degree of Crystallinity Measured on DSC |
| |
| 作者姓名： | 邱高 唐志廉 黄南薰 |
| |
| 作者单位： | Qiu GaoDepartment of Applied Physics，Dong Hua University，Shanghai，200051Tang Zhilian Huang NanxunDepartment of Chemical Engineering，Dong Hua University，Shanghai，200051 |
| |
| 摘 要： | A modified mathematical model based on the melting and recrystallization of an initial distribution of melting temperatures predicts the melting behavior of polymer in differential scanning calorimetry ( DSC ) , taking into account of changes in heat of fusion with melting temperature of crystal and average heat capacity of sample. It has been used to analytically prove that the crystallinity measured on a DSC diagram could not be equal to the weight percentage of crystalline state in the initial specimen. The deviation of the measured crystallinity, as observed relevant to the melting and recrystallization processes, is caused by the changes of the heat of fusion with the melting temperature of crystals, as well as the difference of heat capacities of liquid and solid state polymer. Furthermore, upper and lower limits of the deviation have been discussed.
|
Some Remarks on the Degree of Crystallinity Measured on DSC |
| |
| Qiu Gao.Some Remarks on the Degree of Crystallinity Measured on DSC[J].Journal of Donghua University,2001,18(3). |
| |
| Authors: | Qiu Gao |
| |
| Institution: | 1. Department of Applied Physics, Dong Hua University, Shanghai, 200051
2. Department of Chemical Engineering, Dong Hua University, Shanghai, 200051 |
| |
| Abstract: | A modified mathematical model based on the melting and recrystallization of an initial distribution of melting temperatures predicts the melting behavior of polymer in differential scanning calorimetry ( DSC ) , taking into account of changes in heat of fusion with melting temperature of crystal and average heat capacity of sample. It has been used to analytically prove that the crystallinity measured on a DSC diagram could not be equal to the weight percentage of crystalline state in the initial specimen. The deviation of the measured crystallinity, as observed relevant to the melting and recrystallization processes, is caused by the changes of the heat of fusion with the melting temperature of crystals, as well as the difference of heat capacities of liquid and solid state polymer. Furthermore, upper and lower limits of the deviation have been discussed. |
| |
| Keywords: | degree of crystallinity differential scanning calorimetry (DSC) |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
