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12345ruby629(½ð±Ò+10, ·­ÒëEPI+1): 2011-05-07 13:04:13
To further control the structure and properties of polyimide in the main chain that contained the structure of benzene and oxazole
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12345ruby629(½ð±Ò+10): 2011-05-07 13:04:20
and  in order to prepare high-performance polyimide copolymer film material to meet  the different needs.
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12345ruby629(½ð±Ò+20): 2011-05-07 13:04:29
In the paper PDA, BOA, BIA, DABA, and DA were used as materials to prepare  three types   of the copolymer with different relative content of BOA,  four corresponding homopolymer were prepared for comparison
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12345ruby629(½ð±Ò+20): 2011-05-07 13:04:37
Systematic  study was taken  on the polymer aggregation structure, mechanical properties, heat resistance, water absorption, light transmission and other properties with the introduction of BIA, DABA and ODA.
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12345ruby629(½ð±Ò+40): 2011-05-07 13:04:46
the results of structure and properties of the copolymer  showed that compared with  homopolymer  A, the introduction of  BIA, DABA and the DA  to the molecular chain made  the tensile strength of copolymer films, the 5% and 10% weight loss temperature, the crystallization ability or the degree of order all have different degrees of decline, but the film's elastic modulus, elongation, Tg, light transmission had different trends  of the performances according to the intrduced different groups.
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12345ruby629(½ð±Ò+30): 2011-05-07 13:04:54
In addition, the introduction of  BIA and DABA made the copolymer molecular chain  much more compact than the average of their corresponding  piled  molecular chain of the homopolymers . the hydrogen bonding interaction between  of different segments ofthe copolymer in the copolymer main chain  made Tg measured by the FOX equation   occurs in the positive deviation compared  with the theoretical value .
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12345ruby629(½ð±Ò+30): 2011-05-07 13:05:10
With the relative content of DABA in the copolymer increasing, the copolymer tends to form self-hydrogen bonding  between the amide groups in itself; so  the glass transition presented by the three kinds of interaction between the molecular chains of molecular chains gradually converted to two kinds of interaction .
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12345ruby629(½ð±Ò+30): 2011-05-07 13:05:23
the prepared  films had  high tensile strength and modulus, good toughness , heat resistance, and thermal stability and also low water absorption. The study also found that the degree of freedom in   ab sequence including  BOA of benzene chain and ones which had ODA segment and the segment with the formation of between  is greater than the corresponding homopolymer chain  aa sequence containing BOA and  bb sequenc containing ODA , leading to Tg  measured by the FOX equation smaller than the theoretical value calculated .
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9Â¥2011-05-05 20:57:32
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