The role of hydrogen bonding in rigid-rod polymers: the crystal structure of a polybenzobisimidazole model compound

Tomlin, D. W.; Fratini, Albert; Hunsaker, M.; Adams, Walter

doi:10.1016/s0032-3861(00)00242-1

Cited by 70 publications

(46 citation statements)

References 36 publications

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“…This may indicate that despite the lack of inter-chain bonding in PBO [24,25] the HMC fibre has a level of radial crystallite orientation similar to PPTA which has hydrogen bonding between chains [26]. A similar study on Kevlar 49 has reported a significantly lower FWHM value of 568 [27], similar to the value of 558 in this study for PBO AS.…”

Section: Intensity Modellingsupporting

confidence: 73%

Crystallographic texturing in single poly(p-phenylene benzobisoxazole) fibres investigated using synchrotron radiation

Davies

Eichhorn²,

Young

2005

Polymer

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Section: Intensity Modellingsupporting

confidence: 73%

Crystallographic texturing in single poly(p-phenylene benzobisoxazole) fibres investigated using synchrotron radiation

Davies

Eichhorn²,

Young

2005

Polymer

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“…Compared with PIPD, PBIs, especially poly(p-phenylene benzobisimidazole) (PBI, 5), are difficult to synthesize to high MW polymers, because their low MW oligomers tend to crystallize out of PPA solution before the condensation polymerization greatly advances. This is due to preferential formation of a stable hydrogen bonded network in the presence of the condensation water, and this hydrogen network is more energetically favorable than the fully protonated molecular species dissolved in the solvent (52). Contrarily, PIPD can attain high MW via the formation of the TAP-DHTA (1:1) complex, the TD salt, which affords a fast polymerization cycle and eliminates low MW polymers when amine is polymerized with acid in PPA medium (10,52).…”

Section: Synthesismentioning

confidence: 99%

Rigid‐Rod Polymers

Wang¹,

Jiang²,

Adams³

2011

Encyclopedia of Polymer Science and Technology

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Pursuing high strength and high modulus polymer fibers and novel electrooptical properties have motivated much research activity in rigid‐rod polymers in the past 40 years. In this review, we examine the synthesis, structures, and properties of rigid‐rod polymers with emphasis on polybenzobisoxazoles (PBO), polybenzobisthiazoles (PBZT) and polybenzimidazoles (PBI), beginning with their solution properties, especially lyotropic liquid crystallinity. High performance fibers spun from lyotropic liquid crystalline polyphosphoric acid (PPA) solution are described. The characterization of fiber properties including mechanical, thermal, electrical, and optical properties is summarized. PBO (Zylon) and PIPD (M5) fibers were successfully commercialized in high strength applications such as body armor, ropes, cables, and recreational equipment in the last 10 years, and we discuss the possible causes of rapid degradation of some PBO fibers. The concepts of molecular composites and nanocomposites provide new applications in antiballistic materials, fire protection, athletic equipment, cables, strings, ropes, cordage, sails, multilayer circuits, and catalyst supports. Recently, rigid‐rod polymer films have drawn attention in the electrooptical fields, especially for phosphoric acid (PA)‐doped PBI membranes (Celtec MEAs) in the applications of high temperature fuel cells. Computer simulation has been employed as a powerful tool to predict the properties of the rigid‐rod polymers.

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“…Chen et al [6] reported a novel PI containing benzimidazole units that showed a good adhesion and a nearly equal CTE value to copper. However, the polymers containing benzimidazole units generally exhibited a high affinity for water, up to 5% water being retained in the polymer even after days of drying in a vacuum oven, [16] which made this PI less attractive in two-layer FCCL applications.…”

Section: Introductionmentioning

confidence: 99%

Novel Poly(benzoxazole-etherimide) Copolymer for Two-Layer Flexible Copper-Clad Laminate

Zhuang

2012

Journal of Macromolecular Science, Part B

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A new random co-polyimide (co-PI), poly (benzoxazole-etherimide), was prepared via the poly(amic acid) from the reaction of 5-amino-2-(4-aminobenzene)-1,3-benzoxazole (BOA) and 4,4 -oxydianiline (ODA) with 3,3 ,4,4 -biphenyl tetracarboxylic dianhydride (BPDA) at a diamine molar ratio of 6:4. The BOA-type and ODA-type homo-PIs were also prepared for comparison. The aggregation structure and properties of the PI films were analyzed. The co-PI film showed a good balance in thermal properties, tensile strength, film toughness, and water absorption. The two-layer flexible copper-clad laminates made from these PIs were produced by coating poly(amic acid) solutions onto copper foils and then imidizing thermally. The adhesion properties and relative thermodimensional stability of the laminates were evaluated. The laminate based on the co-PI had higher relative thermodimensional stability as well as better adhesion property than those based on the two homo-PIs, which is due to the improvement in both the bonding strength of PI/copper at the interface and the cohesive strength of the co-PI itself in the boundary layer near the interface.

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The role of hydrogen bonding in rigid-rod polymers: the crystal structure of a polybenzobisimidazole model compound

Cited by 70 publications

References 36 publications

Crystallographic texturing in single poly(p-phenylene benzobisoxazole) fibres investigated using synchrotron radiation

Crystallographic texturing in single poly(p-phenylene benzobisoxazole) fibres investigated using synchrotron radiation

Rigid‐Rod Polymers

Novel Poly(benzoxazole-etherimide) Copolymer for Two-Layer Flexible Copper-Clad Laminate

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