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sltmac(½ð±Ò+2): ллӦÖú~~ 2011-05-06 00:02:20
12345ruby629(½ð±Ò+10, ·ÒëEPI+1): 2011-05-07 13:04:13
sltmac(½ð±Ò+2): ллӦÖú~~ 2011-05-06 00:02:20
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 |

2Â¥2011-05-05 12:16:09
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3Â¥2011-05-05 12:17:40
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4Â¥2011-05-05 12:21:27
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5Â¥2011-05-05 12:24:45
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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. |

6Â¥2011-05-05 20:35:51
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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 . |

7Â¥2011-05-05 20:44:11
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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 . |

8Â¥2011-05-05 20:49:32
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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 . |

9Â¥2011-05-05 20:57:32
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ringzhu(½ð±Ò+10): 2011-05-07 19:04:33
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