Miscibility of fluoro-containing polyimide blends

Tai Shung Chung; E. Ronald Kafchinski

doi:10.1016/0032-3861(96)83712-8

Miscibility of fluoro-containing polyimide blends

Tai Shung Chung^*, E. Ronald Kafchinski

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Experimental results confirm the general rules for miscible polyimide pairs containing the hexafluoro-isopropylidene group if (1) the dianhydride composition is the same in each pair and (2) the diamine is changed from the 3,3′ (meta-substituted) 6F-diamine to the 4,4′ (para-substituted) 6F-diamine. These rules are also applicable to end-capped polyimide pairs. This conclusion is supported with the calculations of χ values based on the Flory-Huggins theory. We also discover two interesting polyimide alloys: 6FDA-PMDA-3,3′-6F-diamine/6FDA-PMDA-4,4′-6F-diamine forms fully miscible blends, while 6FDA-3,3′-6F-diamine/BTDA-4,4′-6F-diamine forms partially miscible blends (6FDA = hexafluorodianhydride, PMDA = pyromellitic dianhydride, BTDA = benzophenonetetracarboxylic dianhydride). These surprising results confirm that the rigidity, bond angle, space and the length of the dianhydride can significantly affect the molecular packing and miscibility tendency of polyimide blends.

Original language	English (US)
Pages (from-to)	1635-1640
Number of pages	6
Journal	Polymer
Volume	37
Issue number	9
DOIs	https://doi.org/10.1016/0032-3861(96)83712-8
State	Published - Apr 1996
Externally published	Yes

Keywords

Blend miscibility
Fluoropolyimides
Glass transition temperature

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/0032-3861(96)83712-8

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title = "Miscibility of fluoro-containing polyimide blends",

abstract = "Experimental results confirm the general rules for miscible polyimide pairs containing the hexafluoro-isopropylidene group if (1) the dianhydride composition is the same in each pair and (2) the diamine is changed from the 3,3′ (meta-substituted) 6F-diamine to the 4,4′ (para-substituted) 6F-diamine. These rules are also applicable to end-capped polyimide pairs. This conclusion is supported with the calculations of χ values based on the Flory-Huggins theory. We also discover two interesting polyimide alloys: 6FDA-PMDA-3,3′-6F-diamine/6FDA-PMDA-4,4′-6F-diamine forms fully miscible blends, while 6FDA-3,3′-6F-diamine/BTDA-4,4′-6F-diamine forms partially miscible blends (6FDA = hexafluorodianhydride, PMDA = pyromellitic dianhydride, BTDA = benzophenonetetracarboxylic dianhydride). These surprising results confirm that the rigidity, bond angle, space and the length of the dianhydride can significantly affect the molecular packing and miscibility tendency of polyimide blends.",

keywords = "Blend miscibility, Fluoropolyimides, Glass transition temperature",

author = "Chung, {Tai Shung} and Kafchinski, {E. Ronald}",

year = "1996",

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doi = "10.1016/0032-3861(96)83712-8",

language = "English (US)",

volume = "37",

pages = "1635--1640",

journal = "Polymer",

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T1 - Miscibility of fluoro-containing polyimide blends

AU - Chung, Tai Shung

AU - Kafchinski, E. Ronald

PY - 1996/4

Y1 - 1996/4

N2 - Experimental results confirm the general rules for miscible polyimide pairs containing the hexafluoro-isopropylidene group if (1) the dianhydride composition is the same in each pair and (2) the diamine is changed from the 3,3′ (meta-substituted) 6F-diamine to the 4,4′ (para-substituted) 6F-diamine. These rules are also applicable to end-capped polyimide pairs. This conclusion is supported with the calculations of χ values based on the Flory-Huggins theory. We also discover two interesting polyimide alloys: 6FDA-PMDA-3,3′-6F-diamine/6FDA-PMDA-4,4′-6F-diamine forms fully miscible blends, while 6FDA-3,3′-6F-diamine/BTDA-4,4′-6F-diamine forms partially miscible blends (6FDA = hexafluorodianhydride, PMDA = pyromellitic dianhydride, BTDA = benzophenonetetracarboxylic dianhydride). These surprising results confirm that the rigidity, bond angle, space and the length of the dianhydride can significantly affect the molecular packing and miscibility tendency of polyimide blends.

AB - Experimental results confirm the general rules for miscible polyimide pairs containing the hexafluoro-isopropylidene group if (1) the dianhydride composition is the same in each pair and (2) the diamine is changed from the 3,3′ (meta-substituted) 6F-diamine to the 4,4′ (para-substituted) 6F-diamine. These rules are also applicable to end-capped polyimide pairs. This conclusion is supported with the calculations of χ values based on the Flory-Huggins theory. We also discover two interesting polyimide alloys: 6FDA-PMDA-3,3′-6F-diamine/6FDA-PMDA-4,4′-6F-diamine forms fully miscible blends, while 6FDA-3,3′-6F-diamine/BTDA-4,4′-6F-diamine forms partially miscible blends (6FDA = hexafluorodianhydride, PMDA = pyromellitic dianhydride, BTDA = benzophenonetetracarboxylic dianhydride). These surprising results confirm that the rigidity, bond angle, space and the length of the dianhydride can significantly affect the molecular packing and miscibility tendency of polyimide blends.

KW - Blend miscibility

KW - Fluoropolyimides

KW - Glass transition temperature

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DO - 10.1016/0032-3861(96)83712-8

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JF - Polymer

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ER -

Miscibility of fluoro-containing polyimide blends

Abstract

Keywords

ASJC Scopus subject areas

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