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¸÷λ´óÏÀ£º ÎÄÕÂÀïÓм¸¾ä»°£¬¾õµÃдµÃÓеãÎÊÌ⣬Çë´ó¼Ò°ïæÐ޸ģ¡ 1. However, crosslinks reduce the crystallinity degree (Xc) (in Table 2) simultaneously and hence increase the free volume, which would increase the segmental mobility in the amorphous domain. È»¶ø£¬½»ÁªÍ¬Ê±Ò²Ê¹½á¾§¶ÈϽµ£¬ÏàÓ¦µÄ×ÔÓÉÌå»ý¾Í±ä´óÁË£¬Õâ¾ÍʹÎÞ¶¨ÐÎÇøÓòµÄ·Ö×ÓÁ´µÄÔ˶¯±äµÃÈÝÒ×ÁË¡£ 2. The influence of the former may be exactly counteracted by that of the latter. Hence, the Tg does not undergo any visible changes. ǰÕßµÄÓ°Ïì¸ÕºÃ±»ºóÕßµÖÏû¡£Òò´Ë£¬Tg ¼¸ºõûÓз¢Éúʲô±ä»¯¡£ 3. Thus, it can be concluded that appropriate feed of excess H is an effective and feasible approach to improve the mechanical properties Òò´Ë£¬ÎÒÃÇ¿ÉÒԵóö½áÂÛͶÈëÊÊÁ¿¹ýÁ¿µÄHÊÇÌá¸ßÁ¦Ñ§ÐÔÄܵÄÒ»¸öÓÐЧ¿ÉÐеķ½·¨¡£ 4. Simultaneously, as shown in Table 2, an increase in crosslink density accompanies with a reduction in Xc, which deteriorates the mechanical strengths but enhances the toughness. ͬʱ£¬Èç±í2Ëùʾ£¬ ½»ÁªÃܶȵÄÌá¸ß°éËæ×Žᾧ¶ÈµÄϽµ£¬Õâ¾ÍʹÁ¦Ñ§Ç¿¶È±ä²î£¬µ«ÊÇʹÈÍÐÔ±äºÃ¡£ 5. While the tensile strength and flexural modulus vary little when H increases from 1.2 to 1.3, resulting from the equal influence of crosslink density and Xc. ¶øH´Ó1.2ÔöÖÁ1.3ʱ£¬ÀÉìÇ¿¶ÈºÍÍäÇúÄ£Á¿¼¸ºõûÓз¢Éúʲô±ä»¯£¬ÕâÊÇÒòΪ½»ÁªÃܶȺͽᾧ¶È¶ÔÁ¦Ñ§ÐÔÄܵÄÓ°Ïì³Ì¶ÈÏàͬ¡£ |
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¶ÔÎÇÓã(½ð±Ò+4):¹ÄÀøÐ³潻Á÷~~~ 2010-04-02 20:13
hubeizlc(½ð±Ò+2): 2010-05-02 13:07
¶ÔÎÇÓã(½ð±Ò+4):¹ÄÀøÐ³潻Á÷~~~ 2010-04-02 20:13
hubeizlc(½ð±Ò+2): 2010-05-02 13:07
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1.µÚÒ»¾äµÄÔÒò½á¹ûŪ·´Á˰ɣ¬ÔÒòÊǺóÃæµÄthe free volume, which would increase the segmental mobility in the amorphous domain£¬½á¹ûÊÇÇ°ÃæµÄreduce the crystallinity degree (Xc) (in Table 2) simultaneously¡£ 2.The influence of the former happens to be counteracted by the latter one. Hence, there is no obvious change in the Tg value. 3.µÚÈý¾ä»¹¿ÉÒÔ£¬Ã»ÓÐÎÊÌâ¡£ 4.accompaniis with »»³É is accompanied by 5.resulting from... ¸Ä³É which is due to the influence of crosslink density is roughly the same with that of Xc. ¿´¿´ÈçºÎ |
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