Two-step thermal conversion from poly(amic acid) to polybenzoxazole via polyimide: Their thermal and mechanical properties

Chang, Jin‐Hae; Park, Kwang Min; Lee, Soomin; Oh, Jae Buem

doi:10.1002/1099-0488(20001001)38:19<2537::aid-polb50>3.0.co;2-v

Cited by 52 publications

(13 citation statements)

References 17 publications

(18 reference statements)

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“…The primary infrared bands are listed in Table 5. Assignments are made on the basis of literature data [30,33,34,35,36] and studies carried out in our lab using model compounds. Benzoxazole and 2-phenyl benzoxazole model compounds were analyzed to identify the peaks in the PBO spectrum that are attributed to the oxazole or benzoxazole component in the PBO structure.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Chin¹,

Byrd²,

Forster³

et al. 2006

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Problems with the performance and durability of body armor based on poly(p-phenylene-2,6-benzobisoxazole) (PBO) fiber became apparent in the summer of 2003, when PBO-based body armor that had been manufactured less than 8 months earlier was penetrated by a bullet. Mechanical testing of the yarns taken from the penetrated vest indicated a 30 % decrease in tensile strength relative to yarns taken from new, unworn PBO-based vests of the same model. A number of analytical metrologies were used to characterize the yarns, including chemical (elemental and molecular) analysis, mechanical testing, thermal analysis and microscopy. Attenuated total reflectance (ATR) infrared analyses of the yarns revealed differences in their degree of hydrolytic degradation as determined by the presence of benzamide structures. The rank order of reduction in benzamide, which corresponds to benzamide hydrolysis, correlates with the rank order reduction in tensile strengths for these same yarns.

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Section: Infrared Spectroscopymentioning

confidence: 99%

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Chin¹,

Byrd²,

Forster³

et al. 2006

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“…After the thermal conversion, the absorptions peaks originating from the imide moiety at 1716 cm -1 (C=O symmetric stretching), 1370 cm -1 (C-N stretching), and 723 cm -1 (C=O bending of imide) were observed. Finally, the absorption peaks at 1600 and 1460 cm -1 were confirmed to form the benzoxazole ring [14]. The FT-IR spectra of the r-GO/PBO composites at 1600 and 1460 cm -1 that result from the PBO unit were observed as shown in Fig.…”

Section: Synthesis Of Poly(amic Acid) and Its Nanocomposite Solutionsmentioning

confidence: 85%

Synthesis and characterization of polybenzoxazole/graphene oxide composites via in situ polymerization

Lim¹,

Kim²,

Goh³

et al. 2013

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In this study, poly(amic acid) was prepared via a polycondensation reaction of 3,3'-dihydroxybenzidine and pyromellitic dianhydride in an N-methyl-2-pyrrolidone solution; reduced graphene oxide/polybenzoxazole (r-GO/PBO) composite films, which significantly increased the electrical conductivity, were successfully fabricated. GO was prepared from graphite using Brodie's method. The GO was used as nanofillers for the preparation of r-GO/PBO composites through an in situ polymerization. The addition of 50 wt% GO led to a significant increase in the electrical conductivity of the composite films by more than sixteen orders of magnitude compared with that of pure PBO films as a result of the electrical percolation networks in the r-GO during the thermal treatment at various temperatures within the films.

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“…Figure 2 shows the FTIR spectrum of BBODPA. It is observed that a broad O-H stretch is presented at 2000-3700 cm -1 , 20 carbonyl group at 1688 cm -1 (C=O acidic, stretching), asymmetric C=C at 1610 cm -1 (C=C, stretching) and CN of benzoxazole at 1268 cm -1 (C=N, stretching). …”

Section: Monomer Synthesesmentioning

confidence: 99%

Synthesis of Poly (Bibenzimidazole-P-Phenyl- Benzobisoxazole)

Chen

Cui

et al. 2009

J. Chil. Chem. Soc.

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A diacid monomer of benzobisoxazole 2, 6-di(p-phenylene-carboxylic) acid (BBODPA) was synthesized in a simple procedure, and characterized by means of FTIR, 1 H NMR and 13 C NMR. The resulting BBODPA was polymerized with 3, 3'-diaminobenzidine tetrahydrochloride (DAB) to prepare poly (bibenzimidazolep-phenyl-benzobisoxazole) (PBBIBBO) in polyphosphoric acid. The inherent viscosities values of PBBIBBO indicated that it was a kind of high molecular weight polymer. The structure of PBBIBBO was confirmed by 1 H NMR, 13 C NMR and FTIR. Thermal properties and dissolubility of PBBIBBO were also investigated. These results showed that PBBIBBO exhibited good thermal stability.

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Two-step thermal conversion from poly(amic acid) to polybenzoxazole via polyimide: Their thermal and mechanical properties

Cited by 52 publications

References 17 publications

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Synthesis and characterization of polybenzoxazole/graphene oxide composites via in situ polymerization

Synthesis of Poly (Bibenzimidazole-P-Phenyl- Benzobisoxazole)

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