| DETECTION OF T_g BY MODULATED DIFFERENTIAL SCANNING CALORIMETRY |
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| 作者姓名： | 宋锐 陈晶 高金贵 林辛 范庆荣 |
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| 作者单位： | Polymer Physics Laboratory，Institute of Chemistry，Chinese Academy of Sciences，Beijing 100080，China，Polymer Physics Laboratory，Institute of Chemistry，Chinese Academy of Sciences，Beijing 100080，China，Polymer Physics Laboratory，Institute of Chemistry，Chinese Academy of Sciences，Beijing 100080，China，Polymer Physics Laboratory，Institute of Chemistry，Chinese Academy of Sciences，Beijing 100080，China，Polymer Physics Laboratory，Institute of Chemistry，Chinese Academy of Sciences，Beijing 100080，China |
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| 基金项目： | This work is supported by the National Key Projects for Foundamental Research,“Macromolecular Condensed State”,of the State Science and Technology Commission of China.and National Natural Science Foundation of China |
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| 摘 要： | The glassy transition of the polyethylene terephthalate (PET) sampleswhich have been subjected to solvent induced crystallization (SINC) was investigated bymodulated differential scanning calorimetry (MDSC) and density measurement. The dif-ferential of heat capacity signal, d C_p/dT from MDSC, was used to monitor the SINCprocess. It reveals that the T_g temperature shifts to higher value with the advancement ofSINC. When the toluene-immersing time was longer (168h), the detection of T_g becomemore difficult, because some smaller peaks emerged at the lower temperatures and theseare explained as the movement of small segments in the amorphous region. These observedresults are due to the morphology and structure introduced by the SINC process.
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| 收稿时间： | 1997-07-09 |
DETECTION OF Tg BY MODULATED DIFFERENTIAL SCANNING CALORIMETRY* |
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| SONG Rui,CHEN Jing,GAO Jingui,LIN Xin,FAN Qingrong.DETECTION OF T_g BY MODULATED DIFFERENTIAL SCANNING CALORIMETRY[J].Chinese Journal of Polymer Science,1998,0(4):332-338. |
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| Authors: | SONG Rui CHEN Jing GAO Jingui LIN Xin FAN Qingrong |
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| Institution: | Polymer Physics Laboratory; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100080; China |
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| Abstract: | The glassy transition of the polyethylene terephthalate (PET) sampleswhich have been subjected to solvent induced crystallization (SINC) was investigated bymodulated differential scanning calorimetry (MDSC) and density measurement. The dif-ferential of heat capacity signal, d C_p/dT from MDSC, was used to monitor the SINCprocess. It reveals that the T_g temperature shifts to higher value with the advancement ofSINC. When the toluene-immersing time was longer (168h), the detection of T_g becomemore difficult, because some smaller peaks emerged at the lower temperatures and theseare explained as the movement of small segments in the amorphous region. These observedresults are due to the morphology and structure introduced by the SINC process. |
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| Keywords: | Modulated DSC Polyethylene terephthalate SINC |
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