2008
DOI: 10.1021/ma071665p
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Segmented Polyimides with Poly(ethylene oxide) Blocks Exhibiting Liquid Crystallinity

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Cited by 17 publications
(18 citation statements)
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“…These transition phases in the polyimide 1 correspond to crylstal, liquid crystal, and isotropic phases. The polyimide 1 shows liquid crystallinity with lower transition temperature compared to the corresponding polyimides containing alkyl or oxyethylene spacer units having same numbers of atoms [8,9]. This can be due to higher flexibility of siloxane spacer unit within the polymer main chain.…”
Section: Resultsmentioning
confidence: 98%
“…These transition phases in the polyimide 1 correspond to crylstal, liquid crystal, and isotropic phases. The polyimide 1 shows liquid crystallinity with lower transition temperature compared to the corresponding polyimides containing alkyl or oxyethylene spacer units having same numbers of atoms [8,9]. This can be due to higher flexibility of siloxane spacer unit within the polymer main chain.…”
Section: Resultsmentioning
confidence: 98%
“…Polymer A4 was characterized by gel permeation chromatography using DMF/LiCl (0.1 M) as eluant; other polymers were insoluble. The estimated molecular weight at the peak of the chromatogram was 66 kg mol −1 based on polystyrene standards, an indication of a high degree of polymerization . Glass‐transition temperatures ( T g′ s) were determined with the aid of a Perkin‐Elmer DSC2 using a heating rate of 10 °C min −1 .…”
Section: Methodsmentioning
confidence: 99%
“…Kricheldorf and Linzer identified specific polyimides of type A, Figure , based on diaminoalkanes with 7–12 methylene units, that form liquid crystalline mesophases at elevated temperatures. In a previous article, we demonstrated that polyimides A, Figure (A) with aliphatic segments derived from poly(ethyleneoxide) oligomers and terminated 4‐aminophenoxy units also form liquid crystalline mesophases at elevated temperatures A recent examination of all known segmented polyimides, has shown that that. While very few specific examples form liquid—crystalline mesophases, most of them undergo segregation of their aromatic and aliphatic components and are crystalline at lower temperatures, exceptions being those based on 2,2‐bis‐(3,4‐dicarbopxlylphenyl)‐hexafluoropropane (6FDA) which remain amorphous and only exhibit glass transition temperatures .…”
Section: Introductionmentioning
confidence: 95%
“…Several segmented polyimides have now been investigated . Two series based on 3,3′,4,4′‐biphenyltetracarboxylic acid dianhydride (BPDA), one with polymethylene segments, and the other with PEO segments, exhibit crystalline melting to smectic liquid crystal and mesophase to isotropic liquid transitions.…”
Section: Introductionmentioning
confidence: 99%
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