|Synthesis and properties of soluble cross-linkable fluorinated co-polyimides|
|H. Y. Yao; Y. H. Zhang; K. Y. You; Y. Liu; Y. Song; S. Y. Liu; S. W. Guan
|Source Publication||Reactive & Functional Polymers
|Abstract||A series of high molecular weight soluble fluorinated cross-linkable co-polyimides (Co-PIs) were synthesized from 1,3-bis(2-trifluoromethyl-4-aminophenoxy)-5-(2,3,4,5-tetrafluorophenoxy)benzene (6FTFPB), 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB), 1,4-bis(4-amino-2-trifluoromethyl-phenoxy)-2-(3'-trifluoro-methylphenyl)benzene (m-3F-6FAPB) and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). The weight-average molecular weights (M(w)s) and polydispersities of the co-polyimides were in the range 5.53-7.24 and 1.71-2.04, respectively. By adjusting the feed ratio of diamines, the refractive indices of Co-PIs films were exactly tuned in the range of 1.5203-1.5574 at 633 nm. The co-polyimides showed outstanding solubility in organic solvents and high thermal stability (5% thermal weight-loss temperature beyond 525 degrees C). Meanwhile, the films had excellent mechanical properties with high tensile strength of 100-108 MPa, Young's modulus of 3.3-4.2 GPa and elongations at break of 8-15%. Polymers in the form of cast and spun films could be cross-linked by thermal curing at 260 degrees C. After curing, the Co-PIs films showed excellent chemical resistance, high glass transition temperatures above 270 degrees C, higher mechanical properties and thermal stability (5% thermal weight-loss temperature beyond 540 degrees C) and low dielectric constant in the range of 2.37-2.70. (C) 2014 Elsevier Ltd. All rights reserved.|
; zhang, yunhe
; you, kaiyuan
; liu, yu
; song, ying
; liu, shanyou
; guan, shaowei] jilin univ, alan g macdiarmid inst, changchun 130012, peoples r china. [liu, yu] chinese acad sci, inst met res, shenyang 110016, peoples r china.
; guan, sw (reprint author), jilin univ, alan g macdiarmid inst, qianjin st 2699, changchun 130012, peoples r china.
Performance Functional Polyimides
Different Pendant Groups
H. Y. Yao,Y. H. Zhang,K. Y. You,et al. Synthesis and properties of soluble cross-linkable fluorinated co-polyimides[J]. Reactive & Functional Polymers,2014,82:58-65.
H. Y. Yao.,Y. H. Zhang.,K. Y. You.,Y. Liu.,Y. Song.,...&S. W. Guan.(2014).Synthesis and properties of soluble cross-linkable fluorinated co-polyimides.Reactive & Functional Polymers,82,58-65.
H. Y. Yao,et al."Synthesis and properties of soluble cross-linkable fluorinated co-polyimides".Reactive & Functional Polymers 82(2014):58-65.
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