Preparation of Well-oriented Poly(p-phenylene pyromelliteimide) Fiber via                 Shear-induced Orientation of Poly(amic ethyl ester) Precursor during Polymerization

Zhuang, Jin; Kimura, Kunio; Xia, Chu E.; Yamashita, Yuhiko

doi:10.1177/0954008305044618

Cited by 4 publications

(1 citation statement)

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“…This procedure was applied to the preparation of polyimide from 1,4-phenylene diamine and 2,5-diethoxycarbonyl-1,4-benzenedicarbonyl chloride. 123 The strong shear stress was applied to the gel and the uni-axial orientation of the polyamide precursor molecular chains was induced along the shear direction in the gel rather than the planar mode, and ultimately the PPPI molecular chains were welloriented.…”

Section: Shear-induced Chain Orientation During Gelation In Polymerizmentioning

confidence: 99%

Morphology Control of Aromatic Polymers in Concert with Polymerization

Kimura

Kohama

Yamazaki

2006

Polym J

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ABSTRACT:Morphology control methods of aromatic polymers in concert with polymerization reaction are described in this review. Many attractive methods have been developed including reaction-induced phase separation of oligomers, epitaxial polymerization, shear-induced chain orientation during gelation, template-based polymerization, suspension polycondensation, solid-state polycondensation and liquid-liquid interfacial precipitation and so on. Among them, the reaction-induced phase separation of oligomers, in which there are two modes of crystallization and liquidliquid phase separation, possess practically high potentiality to create novel polymer materials since it can control not only the morphology but also the molecular chain orientation. Ultimate goal is the embodiment of the nature system in a flask, that is, the control of the materials from primary structures to super structures. The morphology control methods by using polymerization reaction afford the valuable methodology for the three-dimensional structure architecture.[doi:10.1295/polymj.PJ2006083] KEY WORDS Morphology / Phase Separation / Oligomer / Whisker / Microsphere / Epitaxy / Aromatic Polymer / Morphology of polymer materials is of great importance as well as the molecular chain orientation for the creation of new functional and high-performance materials possessing essential properties predicted from their molecular structures. From the both aspects of molecular chain orientation and morphology, one of the ideal materials is a needle-like single crystal of extended molecular chains called polymer whisker. Especially, wide variety of polymeric nanomaterials is required for supporting nanotechnology and the more precise controls are rapidly necessitated in these days. Hence, the demand for the morphology control method increases significantly. Usually, extended molecular chain crystals are difficult to obtain by conventional processing methods and the special processing techniques have been developed thus far.1 There exists another stream for the development of extended molecular chain crystals by means of crystallization during polymerization. The needle-like crystals of both flexible and rigid polymers have been obtained by the solid-state polymerization of the monomers and the polymerization in the solution. Examples of the former polymerization have included oxacyclobutanes such as 1,3,5-trioxane, 2,3 diolefins undergoing four-center type photopolymerization 4,5 and monomers with conjugated triple bonds such as substituted diacetylenes.6,7 On the other hand, the first polymer whisker was obtained by the cationic ring-opening polymerization of 1,3,5-trioxane. [8][9][10] The obtained polyoxymethylene whiskers were 1-2 mm in width and 10-50 mm in length. The molecular chains aligned along the long axis of the whisker. They were brought into practical uses with its unique morphology and good mechanical properties.11,12 However, the polyoxymethylene whisker has a melting temperature at 180 C and the low melting temperature limits the broader c...

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Section: Shear-induced Chain Orientation During Gelation In Polymerizmentioning

confidence: 99%

Morphology Control of Aromatic Polymers in Concert with Polymerization

Kimura

Kohama

Yamazaki

2006

Polym J

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Polyimides

Bryant

2006

Kirk-Othmer Encyclopedia of Chemical Technology

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Polyimides are a class of high performance polymers that contain an imide group, defined as an sp 3 nitrogen bonded to two adjacent carbonyls. This imide structure is most commonly found as part of a five or six membered ring. Aromatic polyimides are noted for their mechanical properties, chemical resistance and dielectric strength. They exist as thermoplastics and thermosets and are available in many formats. Polyimides are used as hot melt adhesives, matrix resins for composites, dielectric films, photoimageable coatings, flex circuits, foams, wire insulation, thin walled tubing, molding resins and high performance bushings and seals. Products that compete with polyimides for niche applications include aerospace epoxies (Dow, Ciba and Shell), cyanate resins (Dow), polysulfones (Solvay), filled polycarbonates and polyesters (Dow, Amoco and GE), polybenzimidazoles (Hoechst‐Celanese) and some high Tg filled phenolics. Although polyimides command a premium price, their versatility, reliability, and demonstrated performance makes them suitable use in high performance applications where failure and replacement costs are high.

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Polyimides

Bryant¹

2006

Encyclopedia of Polymer Science and Technology

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Polyimides are a class of high performance polymers that contain an imide group, defined as an sp 3 nitrogen bonded to two adjacent carbonyls. This imide structure is most commonly found as part of a five‐ or six‐membered ring. Aromatic polyimides are noted for their mechanical properties, chemical resistance, and dielectric strength. They exist as thermoplastics and thermosets and are available in many formats. Polyimides are used as hot melt adhesives, matrix resins for composites, dielectric films, photoimageable coatings, flex circuits, foams, wire insulation, thin‐walled tubing, molding resins, and high performance bushings and seals. Products that compete with polyimides for niche applications include aerospace epoxies (Dow, Ciba, and Shell), cyanate resins (Dow), polysulfones (Solvay), filled polycarbonates and polyesters (Dow, Amoco, and GE), polybenzimidazoles (Hoechst‐Celanese), and some high T g ‐filled phenolics. Although polyimides command a premium price, their versatility, reliability, and demonstrated performance makes them suitable use in high performance applications where failure and replacement costs are high.

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Preparation of Well-oriented Poly(p-phenylene pyromelliteimide) Fiber via Shear-induced Orientation of Poly(amic ethyl ester) Precursor during Polymerization

Cited by 4 publications

References 41 publications

Morphology Control of Aromatic Polymers in Concert with Polymerization

Morphology Control of Aromatic Polymers in Concert with Polymerization

Polyimides

Polyimides

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