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as polystyrene's Tg is as high as 100 degree C while poly1,4-butadiene has a Tg as low as -100 oC, at room temperature PS blocks in the triblock copolymer will form hard spheres connecting flexible PBD blocks and then results in a physical network from micro-phase-separation instead of chemical crosslinking.
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Originally posted by qika531 at 2010-03-18 01:43:23:
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SBSÊôÓÚµäÐ͵ÄÎïÀí½»ÁªÈÈËÜÐÔÊ÷Ö¬£¬PSºÍPSÖ®¼ä¿¿·Ö×Ó¼ä×÷ÓÃÁ¦²ø½áÔÚÒ»Æð£¬ÔÚ¼ÓÈȼôÇеÄ×÷ÓÃÏ·¢Éú½â²ø½á¶ø±íÏÖ³öËÜÁϵÄÐÔÖÊ¡£ÈÈËÜÐÔËÜÁϵĸ߷Ö×ÓÁ´¼ä²¢ÎÞÓÀ¾ÃÐԵĻ¯Ñ§½»Áª,Ö»ÓÐ΢ÈõµÄÎïÀí×÷ÓÃÁ¦ (interaction)ÒÔ¼°ÓÉÓÚÁ´¼ä¾À²øËùÔì³ÉµÄÔÝʱÐÔÎïÀí½»Áª (physical crosslinking)£¬´Ë½»Áª»áËæ¼Ó¹¤¹ý³Ì¶øÓоÀ²ø¼°È¥²øµÄÏÖÏó£¬Òò´ËÈÈËÜÐÔËÜÁÏ»áËæ¼ÓÈȶøÓÐÈí»¯±äÐÎÄËÖÁÓÚÁ÷¶¯µÄÏÖÏó:ËæÎ¶ÈϽµÔòÓй̻¯±äÓ²µÄÇéÐΣ¬Îª¿ÉÄæ¹ý³Ì¡£¸öÈËÀí½â¾ÍÊÇÒ»¶ÑÌØÊâµÄÉþ×Ó²øµ½Ò»ÆðÁË¡£ÖÁÓÚÎïÀí½»Áªµã£¬ÊÇÖ¸²»Í¬Éþ×ӵĽӴ¥µã°É¡£
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