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wangqi2009
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- ×¢²á: 2010-03-22
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- רҵ: ¸ß·Ö×ÓÎïÀíÓë¸ß·Ö×ÓÎïÀí»¯
| The effect of the fusion temperature and time on the crystallinization behavior of PC in PC/PU blends was investigated by differential scanning calorimetry (DSC).The influence indicated that on the same condition with the prolonging of the fusion time ,the crystallization peak shifting to low temperature , crystallization peak temperature and crystallization enthalpy decreased and crystallization peak became wider.When fusion time was same, with the increase of melting temperature ,crystallization peak temperature of PC shifted to low temperature, which decreased by 200 ¡æ> 220 ¡æ> 240 ¡æ . |
6Â¥2010-05-27 10:17:27
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2Â¥2010-05-27 00:07:08
jonas6126
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xuefeifei12555(½ð±Ò+1, ·ÒëEPI+1):15 2010-05-27 10:13:55
xuefeifei12555(½ð±Ò+14): 2010-05-27 10:14:30
xuefeifei12555(½ð±Ò+14): 2010-05-27 10:14:30
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ÓÃDSCÑо¿ÁËÈÛÈÚζÈÓëÈÛÈÚʱ¼ä¶ÔPC/PU¹²»ìÌåϵÖÐPC½á¾§ÐÐΪµÄÓ°Ïì¡£²»Í¬µÄÈÛÈÚζȺÍÈÛÈÚʱ¼ä¶Ô¹²»ìÎïµÄ½á¾§ÐÐΪӰÏì±íÃ÷£¬ÔÚÏàͬµÄÈÛÈÚζÈÌõ¼þÏ£¬PCµÄ½á¾§·åζÈËæ×ÅÈÛÈÚʱ¼äµÄÑÓ³¤ÏòµÍη½ÏòÒÆ¶¯£¬½á¾§·åζȺͽᾧìÊÖµÖð½¥½µµÍ£¬½á¾§·åÖð½¥±ä¿í£»ÔÚÏàͬµÄÈÛÈÚʱ¼äÌõ¼þÏ£¬PCµÄ½á¾§·åζÈËæ×ÅÈÛÈÚζȵÄÌá¸ßÏòµÍη½ÏòÒÆ¶¯£¬½á¾§·åζȰ´200¡æ>220¡æ>240¡æ½µµÍ¡£ DSC was used to study the impact of the fusion temperature and time on the crystallinity of PC in PC/PU blends. It is concluded, from the different influence of fusion temperature and time, that under the same fusion temperature, Tc of PC gets lower with the prolonging of the fusion time. Meanwhile, the enthalpy of crystallinity gets lower and the width of the peak gets broader. Under the same fusion time, Tc of PC gets towards a lower temperature with the increase of fusion temperature. Tc gets lower according to the sequence of 200¡æ>220¡æ>240¡æ. |

3Â¥2010-05-27 00:36:26
jonas6126
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- ×¢²á: 2008-11-06
- ÐÔ±ð: MM
- רҵ: ¹âÆ×¼¼Êõ

4Â¥2010-05-27 00:36:58














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