The effect of hydrogen bonding on the physical and mechanical properties of rigid-rod polymers

Jenkins, Shawn; Jacob, Karl I.; Kumar, Satish

doi:10.1002/1099-0488(20001201)38:23<3053::aid-polb70>3.0.co;2-h

Cited by 38 publications

(37 citation statements)

References 23 publications

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“…Polypyridobisimidazole (PIPD) (or called 'M5'), developed by Sikkema and his colleagues of Akzo Nobel Central Research [6,7], has the highest compressive strength among all the polymeric materials to date (1.7 GPa). Because PIPD fibers have a special bidirectional network of hydrogen bonds in their molecular chains formed by the hydroxyl groups on the phenyl ring, PIPD fibers not only have similar excellent mechanical properties but also show better compressive properties compared with those of PBO fibers.…”

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confidence: 89%

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Preparation and properties of novel PIPD fibers

Zhang

Yang

et al. 2010

Chin. Sci. Bull.

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Poly [2, 6-diimidazo (4,5-b : 4',5'-e) pyridinylene-1,4(2,5-dihydroxy) phenylen] (PIPD) was synthesized and the obtained PIPD/ PPA dope was directly spun into fibers via a dry-jet wet-spinning process for the first time. The obtained polymers were mainly characterized by ATR-FTIR and dynamic contact angle analysis. FTIR spectrum of the PIPD fibers indicates that the product was consistent with the target product. The contact angle measurements show that the wetting process of water on PIPD fibers is apparently faster than that on PBO fibers. The axial compression bending test indicates that PIPD fibers showed larger compressive strength compared with that of PBO fibers under the same axial compressive load. Meanwhile, the TGA test results indicate that the PIPD fibers have excellent thermal stability. PIPD polymer, novel fiber, surface property, axial compressive properties, thermal stability Citation: Zhang T, Jin J H, Yang S L, et al. Preparation and properties of novel PIPD fibers.

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confidence: 89%

“…The thermal decomposition temperature of PIPD fibers are over 530°C in air condition, and its limited oxygen index (LOI) exceeds 50, which is higher than that of aromatic polyamide fibers [7]. Northolit found that PIPD-HT fibers have less smoke than PBO fibers during combustion [15].…”

Section: Thermal Stability Of the Pipd Fibersmentioning

confidence: 99%

Preparation and properties of novel PIPD fibers

Zhang

Yang

et al. 2010

Chin. Sci. Bull.

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“…Compared to the great improvement in tensile properties, so far, all these attempts at introducing strong intermolecular interactions in rigid-rod polymer fibers have achieved limited success and moderate progress in enhancing compressive behavior. In some cases, compressive strengths of more than 500 MPa were reported (267,271,286), but most were in the range of 25-400 MPa (225,260,286).…”

Section: Compressive Properties As Listed Inmentioning

confidence: 99%

“…Because of the presence of intermolecular hydrogen bonding (N-H···O) and intramolecular hydrogen bonding (O-H···N), PIPD forms either hydrogen-bonded sheets or a bidirectional hydrogen-bonded network. The hydrogen bonding produces a strong interaction between macromolecular chains and leads to formation of certain transverse texture, which results in high shear modulus and compressive properties (10,286). With Carr-Parrinello technique based on density functional theory, computer simulation shows that a hydrogen-bonding network exists in PIPD fibers (162).…”

Section: Compressive Properties As Listed Inmentioning

confidence: 99%

“…The enhanced axial shrinkage and an accompanying decrease in the lattice parameter are attributed to chemical changes, and consequent crosslinking taking place within these systems which, in turn, serves to perturb the crystalline structure (309). Thermal-induced chemical changes and cross-linking are considered the reasons for the accelerated shrinkage (286). This property has been used to develop high performance fiber-reinforced composites with negative thermal expansion (310).…”

Section: Compressive Properties As Listed Inmentioning

confidence: 99%

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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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Rigid‐Rod Polymers

Jiang¹,

Eby²,

Adams³

2002

Encyclopedia of Polymer Science and Technology

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The synthesis, structure, properties, and applications of rigid‐rod polymers are described. PBZT and PBZO are selected as the models to be discussed in detail with respect to their fiber, film, and molecular‐composite processing, liquid‐crystal solution behavior, and computer simulations. Emphasis is placed on their ultimate tensile, thermal, chemical, electrical, and optical properties, and how to improve their compressive properties. The current and future usages of rigid‐rod polymers in various scientific, technical, and engineering areas also have been introduced. Many new rigid‐rod polymer materials, such as PPP, PPE, PPV, PTh, and other organometallic polymer systems are included.

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The effect of hydrogen bonding on the physical and mechanical properties of rigid-rod polymers

Cited by 38 publications

References 23 publications

Preparation and properties of novel PIPD fibers

Preparation and properties of novel PIPD fibers

Rigid‐Rod Polymers

Rigid‐Rod Polymers

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