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Alternate D¨CA stacking has been used as a powerful strategy to achieve thermotropic liquid crystalline materials. Ringsdorf and co-workers showed CT-complexation- mediated induction of LC phases in otherwise amorphous main-chain and side-chain polymers with triphenylene donors in the presence of aromatic acceptors such as 2,4,7-trinitrofluorenone and 2,4,7-trinitrofluoren- 9-ylidenemalonodinitrile . The side-chain and main-chain polymers exhibit nematic-columnar and columnar hexagonal phases in the presence of approxiemtely 25% TNF owing to CT interactions. In the presence of a stronger acceptor, TNF-CN,the clearing temperature of the hexagonal phase can be enhanced to about twofold in comparison with that of TNF, thus suggesting not only induction of the mesophases but also modulation of the phase properties are achievable through CT interactions. |
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Ringsdorf and co-workers showed CT-complexation- mediated induction of LC phases in otherwise amorphous main-chain and side-chain polymers with triphenylene donors in the presence of aromatic acceptors such as 2,4,7-trinitrofluorenone and 2,4,7-trinitro fluoren- 9-ylidene malononitrile . The side-chain and main-chain polymers exhibit nematic-columnar and columnar hexagonal phases in the presence of approximately 25% TNF owing to CT interactions. In the presence of a stronger acceptor, the clearing temperature of the hexagonal phase can be enhanced to about twofold in comparison with that of TNF, thus suggesting not only induction of the mesophases but also modulation of the phase properties are achievable through CT interactions. ·Ç´«Í³µÄD-A¶ÑµþÒѱ»ÓÃ×÷Éú²úÈÈÖÂÒº¾§ ²ÄÁϵÄÖØÒªÊֶΡ£ Ringsdorf¼°ÆäͬÊÂÑо¿±íÃ÷ÔÚ·¼Ïã×åÊÜÌåÖîÈç2,4,7 - ÈýÏõ»ùÜÌͪºÍ2,4,7 - ÈýÏõ»ùÜÌ 9 - ÑÇ»ù±û¶þëæ¹©Ìå´æÔÚÏ£¬CT-ÂçºÏ - ½éµ¼ÁËÆäËûһЩ´øÓÐÈýÑDZ½ÅäÌåµÄ·Ç¾§ÏàÖ÷Á´ºÍÖ§Á´¾ÛºÏÎïµÄÒº¾§ÏàÓÕµ¼ ¡£ÓÉÓÚCTÏ໥×÷Óã¬ÔÚÔ¼25£¥TNF´æÔÚÏ£¬²àÁ´ºÍÖ÷Á´¾ÛºÏÎï³ÊÖù×´ÏòÁÐÏàºÍÖù×´Áù½ÇÏà¡£¸üÇ¿µÄÊÜÌå´æÔÚʱ£¬Áù½Ç¾§ÏàµÄÏà±äζÈÓëµ¥¶À TNFÏà±È¿ÉÌá¸ßµ½´óÔ¼Á½±¶¡£´Ó¶ø±íÃ÷ͨ¹ýCTÏ໥×÷Ó㬲»½ö¿ÉÒÔ ÓÕµ¼ÖмäÏ࣬¶øÇÒ¿ÉÒÔʵÏÖÏàÎ»ÌØÐÔµ÷¿Ø ¡£ ÐüÉͽð±ÒÌ«ÉÙ£¬¹À¼ÆÄÑÓÐÈËÓ¦Öú£¬°ïÄã·ÒëÈçÉÏ£¬²¿·ÖÈÏΪÓдíµÄµØ·½Í¬Ê±ÐÞ¸ÄÈçÉÏ£¬Çë×Ô¼ºÔٺ˶Ôһϣ¡ |

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