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1.However, as compared with the common polymers, the poorer mechanical properties of B, especially the lower impact strength, and the higher cost, restrict its application in many industrial fields.  
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2.Though the crystallization behavior of B and its random copolymers has been extensively studied, the crystallization behavior of B based block copolymers has not been well understood.
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3.This seemingly contrary result may be rationalized by
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4.The results of G2 agree well with the results of G1 as depicted in Fig.4.
   G2 µÄ½á¹ûÓëFig.4ÖеĵÈνᾧµÄ½á¹ûÎǺϵĺܺá£

5£®Similar to the reasons of retarded effect of PPSu on G1, the decreased G2 by the incorporation of PPS is also due to the exclusion of PPSu segment, rigidity of PPSu segment. What¡¯s more, as indicated in Fig.6, G2 increases with chain length of B segment. It also interpreted by the reasons for the influence of chain length of B segment on G1, i.e., the difference in ¦¤T, number of urethane groups and allophanate crosslinking points.
  ÓëPPSu¶ÔG1£¨½á¾§ËÙÂÊ£©µÄÒÖÖÆµÄÔ­ÒòÏàͬ£¬PPSu µÄÒýÈëʹG2ϽµµÄÔ­ÒòÒ²ÊÇÒòΪPPSÁ´¶ÎµÄÅųö£¬PPSÁ´¶ÎµÄ¸ÕÐÔ¡£¶øÇÒ£¬ÈçFig.6Ëùʾ£¬G2Ëæ×ÅBÁ´¶Î³¤¶ÈµÄÔö¼Ó¶øÔö¼Ó¡£ÕâÒ²¿ÉÒÔPBÁ´¶Î³¤¶È¶ÔG1µÄÓ°ÏìµÄÔ­ÒòÀ´½âÊÍ£¬Ò²¾ÍÊǦ¤T£¬¾Û°±õ¥»ùÍźÍëå»ù¼×Ëáõ¥½»ÁªµãÊýÄ¿µÄ²»Í¬¡£
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5Â¥2009-05-25 22:57:37
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hubeizlc(½ð±Ò+4,VIP+0):¸óÏÂÓ¢ÓïÕæµÄºÜ°ô£¬·Ç³£¸Ðл¿¶¿®ÏàÖú£¡ 5-25 09:06
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1. However, B shows poorer impact strenght and has higher cost than most of the conventional polymers, which could restrict its industrial application.

2. Though the crystallization behaivor of B homopolymer and its random copolymers has been extensively studied, the crystallization behavior of copolymers of B has been unexplored.

3.This seemingly contrary result may account for

4.The results of G2 agree well with those of G1, as depicted in Fig.4.
3Â¥2009-05-23 14:08:58
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hubeizlc

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Originally posted by aizaianda at 2009-5-25 22:57:
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