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| the new peak at ¦Ä 3.65 ppm was correlated with the methylene proton of p-carbon atom relative to the carbonyl group in PCL. It indicates that the PCL free radical formed by the hydrogen abstraction of the ¦Á-carbon atom relative to the carbonyl group in PCL by the action of the homolytic scission of organic peroxide will attack the double bond in the methacrylate unit¡£ It is well known that free radicals from the thermal homolysis of BPOs can be thought of as having nucleophilic properties , and they can abstract the hydrogen at the ¦Á-carbon atom relative to the carbonyl of PCL, leading to the stabilization of the resulting radical by forming conjugation with the carbonyl group. |
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lardner2003(½ð±Ò+6,VIP+0):лл 3-16 17:53
lardner2003(½ð±Ò+6,VIP+0):лл 3-16 17:53
| ÔÚ»¯Ñ§Î»ÒÆ ¦Ä 3.65 ppm ´¦³öÏÖµÄзåÓë¾Û¼ºÄÚõ¥£¨PCL£©µÄôÊ»ù̼Ô×ÓÏàÁ¬µÄP -̼Ô×ÓÉϵÄÑǼ׻ùÉϵÄÇâÓйأ¬Õâ±íÃ÷£¬¾Û¼ºÄÚõ¥×ÔÓÉ»ùÊÇÓɳéÈ¡¾Û¼ºÄÚõ¥µÄÓëôÊ»ùÏàÁ¬µÄµÄa-̼Ô×ÓµÄÇâÔ×ÓËùÐγɵ쬯ä¾ßÌå²Ù×÷ÊÇÓÉÓлú¹ýÑõ»¯Îï¹¥»÷¼×»ù±ûÏ©Ëá¼×õ¥µ¥ÔªµÄË«¼üʵÏֵġ£ÖÚËùÖÜÖª£¬¸ù¾ÝBPOs µÄÈȽâÀëÀíÂÛ¿ÉÈÏΪ×ÔÓÉ»ù¾ßÓÐÇ׺ËÐÔÄÜ£¬ËûÃÇ¿ÉÒÔÕª³ý¾Û¼ºÄÚõ¥ÖÐÓëôÊ»ùÏàÁ¬µÄ¦Á -̼Ô×ÓÉϵÄÇâÔ×Ó£¬µ¼ÖÂËù²úÉúµÄ×ÔÓÉ»ùµÄͨ¹ýÓëôÊ»ùÐγɹ²éî¶øÌá¸ßÎȶ¨ÐÔ¡£ |

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