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The values are relatively high when compared with the B-a/epoxy thermoset, which possesses 5% degradation temperature at 302-309, dependent on the curing catalyst [32]. Unlike the curing of neat ( 6) (Fig. 2), the characteristic peaks of oxazine did not disappear completely in the ( 6)/DCPDE system after curing at 220 C for 20 min, suggesting a slower curing rate. The carbonyl signal, which was not seen after 140 C treatment, supports the formation of cyclic amide. In contrast to the good solubility of ( 6), preparing benzoxazine ( 7) in chloroform (Run 8) and toluene/ethanol (Runs 9e10) results in powder precipitate (not gelation) after 1 h due to the poor solubility of ( 7), which limits the purity of ( 7). |
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ÖìÑÒ0308: ½ð±Ò+8, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2015-03-06 10:06:51
ÖìÑÒ0308: ½ð±Ò+8, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2015-03-06 10:06:51
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The values are relatively high when compared with the B-a/epoxy thermoset, which possesses 5% degradation temperature at 302-309, dependent on the curing catalyst [32]. ÓëB-a/»·ÑõÈÈÄýÎïÏà±È£¬ÕâЩÊýÖµÏà¶Ô½Ï¸ß¡£ Ôڹ̻¯´Ù½ø¼ÁµÄ×÷ÓÃÏ£¬B-a/»·ÑõÈÈÄýÎïÔÚ302-309¶ÈµÄζÈÇø¼ä£¬·¢Éú5%µÄÈȽµ½â¡£ Unlike the curing of neat ( 6) (Fig. 2), the characteristic peaks of oxazine did not disappear completely in the ( 6)/DCPDE system after curing at 220 C for 20 min, suggesting a slower curing rate. Óëͼ2ÖÐÕûÆë¹Ì»¯²»Í¬µÄÊÇ£¬ÔÚ220ÉãÊ϶ȵĻ·¾³ÖУ¬¾¹ý20·ÖÖӵĹ̻¯ºó£¬¶ñີÄÌØÕ÷·å²»»á´ÓDCPDE ϵͳÖÐÍêÈ«Ïûʧ¡£ The carbonyl signal, which was not seen after 140 C treatment, supports the formation of cyclic amide. ôÊ»ùÐźţ¨ÔÚ¾¹ý140ÉãÊ϶ȵÄÈÈ´¦Àíºó»áÏûʧ£¬»òÕß²»¿É¼û£©ÄÜ´Ù½ø»·õ£°·µÄÐγɡ£ In contrast to the good solubility of ( 6), preparing benzoxazine ( 7) in chloroform (Run 8) and toluene/ethanol (Runs 9e10) results in powder precipitate (not gelation) after 1 h due to the poor solubility of ( 7), which limits the purity of ( 7). Ó루6£©Á¼ºÃµÄÈܽâ¶ÈÐγɶԱȵÄÊÇ£¬ ÔÚÂȷ£¨Run 8£©ºÍ¼×±½/ÒÒ´¼£¨Runs 9e10)ÖУ¬ÖƱ¸±½²¢¶ñຣ¬»áÔÚ1Сʱºó£¬ ÓÉÓÚ£¨7£©µÄÈܽâ¶È½Ï²î£¬²úÉú·ÛÄ©³ÁµíÎ·Ç½ºÄý̬£©£¬ÕâÖÆÔ¼ÁË£¨7£©´¿¶ÈµÄÌáÉý¡£ |
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