An Investigation of the High Performance of a Novel Type of Benzobisoxazole Fiber Based on 3,3-Diaminobenzidine.

Yang Wang,Yuanjun Song,Yudong Huang,Nahla Rahoui,Lei Zhao,Bo Jiang

doi:10.3390/polym8120420

Yang Wang, Yuanjun Song + Show 4 more

Open Access

https://doi.org/10.3390/polym8120420

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Journal: Polymers	Publication Date: Dec 13, 2016
Citations: 2	License type: CC BY 4.0

Affiliation: Harbin Institute of Technology, Heilongjiang University

Abstract

The mechanical and thermal properties of poly{2,6-diimidazo[4,5-b:4′5′-e] pyridinylene-1,4(2,5-dihydroxy) phenylene} (PIPD)-3,3-diaminobenzidine (DAB) fibers were analyzed. Compared to other types of benzimidazole fiber structures and properties, PIPD-DAB is distinguished by a unique combination of strength, tensile modulus, and thermal properties. The PIPD polymer was prepared from 2,3,5,6-tetra-aminopyridine (TAP) and 2,5-dihydroxyterephthalic acid (DHTA) in polyphosphoric acid (PPA). In order to enhance the tensile strength and modulus, a third comonomer, 3,3-diaminobenzidine (DAB), was incorporated into the PIPD molecular structure. The change in molecular structure was recorded using Fourier-transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and wide angle X-ray diffraction (WAXD). Compared to the PIPD fibers (average tensile strength of PIPD is 3.9 GPa, average tensile modulus of PIPD is 287 GPa), the tensile strength and modulus of PIPD-DAB increased to 4.2 and 318 GPa, respectively. In addition, the thermal decomposition temperature of the PIPD fibers is enhanced by 35 °C, due to the incorporated DAB. PIPD-DAB is a promising material for use under high tensile loads and/or high temperatures.

Highlights

High performance fibers, with elevated mechanical and thermal properties, have become important in modern industry, transport, sports, and other areas that create high-strength composites, highly loaded textile structures, and thermostable and difficult-to-combust articles
Even for the high-modulus PIPD fibers developed by Sikkema [6] and co-workers, a large gap between the actual tensile modulus (330 GPa) [7] and the theoretical tensile modulus remains [8,9]
To obtain higher2.orientation of the polymer with structure enhances the tensile and modulus strengths, which will have a considerable effect on the structure enhances the tensile and modulus strengths, which will have a considerable effect on the better mechanical properties, we report here on a new approach in the preparation of PIPD-DAB

Summary

Introduction

With elevated mechanical and thermal properties, have become important in modern industry, transport, sports, and other areas that create high-strength composites, highly loaded textile structures, and thermostable and difficult-to-combust articles. Because the hydrogen bonding network is crucial for the tensile modulus and strength [14], the presence of numerous hydroxyl groups at the edges of DHTA implies that PIPD could interact strongly with other polar polymer matrices. To obtain a higher orientation of the polymer chain with better mechanical properties, we report here on a new approach in the preparation of PIPD-DAB copolymers using one-pot, in situ polycondensation in acidic media. To obtain higher2.orientation of the polymer with structure enhances the tensile and modulus strengths, which will have a considerable effect on the structure enhances the tensile and modulus strengths, which will have a considerable effect on the better mechanical properties, we report here on a new approach in the preparation of PIPD-DAB development of high-performance organic fibers. Schematic copolymers using one-pot, in situ polycondensation in acidicdiagrams media. of the synthesis of PIPD-DAB are in the

Materials

Spinning Technology

A Fourier-transform

Synthesis and Characterization of DAB

Characterization

Mechanical of PIPD

Conclusions