Synthesis and solution properties of extended chain poly(2,6-benzothiazole) and poly(2,5-benzoxazole)

Chow, Andrea W.; Bitler, Steven P.; Penwell, Paul E.; Osborne, Dyan J.; Wolfe, James F.

doi:10.1021/ma00199a002

Cited by 47 publications

(22 citation statements)

References 6 publications

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“…In addition, theoretical calculations of the persistence lengths of the rigid‐rod polymers have been reported, but there are disagreements on the calculation of the PBO persistence length 43–45. Although there is a significant uncertainty associated with the persistence length measurement for highly ordered polymers, it has been experimentally demonstrated that the values of ρ of rigid‐rod PBZT and PBO are higher under the same conditions than those of semi‐rigid polymers such as poly ( p ‐phenylene terephthalamide) (PPTA) ( ρ = 10–17.5 nm),15 poly‐2,5‐benzoxazole ( ρ = 5–9 nm)46,47 and poly‐2,6‐benzothiazole ( ρ = 13 nm) 46,47…”

Section: Solution Propertiesmentioning

confidence: 99%

Rigid‐Rod Polymers: Synthesis, Processing, Simulation, Structure, and Properties

Hu¹,

Jenkins

Min

et al. 2003

Macro Materials & Eng

174

105

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Synthesis, structure, and properties of rigid‐rod polymers with special emphasis on poly(p‐phenylene benzobisoxazole) (PBO) and poly(p‐phenylene benzobisthiazole) (PBZT) have been reviewed. Recent studies on chemical modifications and molecular simulations have also been given. After nearly 20 years of research and development, PBO fiber was commercialized in the late 1990s. However, due to processing difficulties, the concept of the so called molecular composites has not been successful. Development of the high compressive strength M5 and dihydroxy‐PBI fibers clearly suggest that there is potential for further developing properties of this class of materials. Opto‐electronic properties have also been reviewed.Synthesis of PBZT.magnified imageSynthesis of PBZT.

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Section: Solution Propertiesmentioning

confidence: 99%

Rigid‐Rod Polymers: Synthesis, Processing, Simulation, Structure, and Properties

Hu¹,

Jenkins

Min

et al. 2003

Macro Materials & Eng

174

105

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“…If d H is 10 − 7 cm (1 nm), then the Mark-Houwink relationships in MSA are (30,76,77): (54,78). The slope of the curve, 1.8, is in agreement with equation 3.…”

Section: Solution Propertiesmentioning

confidence: 51%

“…The polymer concentration in the spinning solution is often within a factor of 2 of the one corresponding to the isotropic-anisotropic transition (116). Since the transition from isotropic to anisotropic polymerization occurs at 5 wt% PBZT (77), the polymer concentration of the spinning dope is around 10-15% (31,117). Generally, for systems of PBZT and PBO in PPA or MSA, a 13-15% polymer solution with MW greater than 10,000 is chosen for the spinning dope (25,118).…”

Section: Fiber Spinning Processmentioning

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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“…4,6‐Diaminoresorcinol dihydrochloride (DAR 2HCl) was chemically synthesized according to the previous reports [8, 22]. Terephthalic acid (TPA) was purchased from Shanghai Reagents and ground to powder in a glove box prior to use.…”

Section: Methodsmentioning

confidence: 99%

Study on the photoinduced electron‐transfer activity of poly(p‐phenylene benzobisoxazole)/carboxylic multiwalled carbon nanotubes composites prepared by in situ polymerization

et al. 2012

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This article focused on the synthesis of poly(p‐phenylene benzobisoxazole)/carboxylic multiwalled carbon nanotubes (PBO/MWNT‐COOH) composites through in situ polymerization. The effect of MWNT‐COOH on thermal stability and photophysical properties was investigated thoroughly. Especially an in‐depth study was carried out on the detailed process of energy transfer. Ultraviolet‐visible‐near infrared and fluorescence spectroscopy of composites revealed that MWNT interacted with PBO through strong covalent bonds, which was a significant photoinduced charge‐transfer interaction between the two components. Therefore, compared with PBO, both the thermal stability and PL quantum efficiency of PBO/MWNT‐COOH composites were improved. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

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Synthesis and solution properties of extended chain poly(2,6-benzothiazole) and poly(2,5-benzoxazole)

Cited by 47 publications

References 6 publications

Rigid‐Rod Polymers: Synthesis, Processing, Simulation, Structure, and Properties

Rigid‐Rod Polymers: Synthesis, Processing, Simulation, Structure, and Properties

Rigid‐Rod Polymers

Study on the photoinduced electron‐transfer activity of poly(p‐phenylene benzobisoxazole)/carboxylic multiwalled carbon nanotubes composites prepared by in situ polymerization

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