Structural Evolution and Mechinical Properties of Copolyamide Fibers during Thermal Annealing

Abstract:

Modified aramid (PBIA) containing benzimidazole units in the main chain were synthesized and the corresponding PBIA fibers were prepared by wet spinning and then annealed at different temperatures. The mechanical properties and the structure of copolyamide PBIA fibers were investigated for different annealing temperatures. The results of thermogravimetric analysis showed that the decomplexation reaction between HCl and benzimidazole occurred during the annealing process and HCl was completely removed at 320°C. The decomplexation of HCl also leads to the formation of hydrogen bonds between benzimidazole fragments, resulting in the rearrangement of the molecular chain and a more ordered macromolecular structure. The mechanical properties, chain orientation could be significantly improved when the samples were annealed in the temperature range from 280 to 320 °C. In addition, the analysis of self-elongation during the annealing process further indicates that the macromolecular chains were more ordered after the decomplexation of HCl. In addition, the PBIA fibers firstly annealed at 300°C which the decomplexation reaction between HCl and benzimidazole occurred, and then annealed at 400°C, resulting the higher PBIA fibers are obtained.

• Periodical: Materials Science Forum (Volume 815)
• Pages: 515-522
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.815.515
• Online since: March 2015
• Authors: Ke Li, Long Bo Luo, Jie Yang Huang, Jing Yao, Hui Na Wang, Yan Feng, Xiang Yang Liu
• Keywords: Benzimidazole, Crystallization, Hc, Hydrogen Bond, Orientation

References

[1] H.F. Mark, S.M. Atlas, N. J. Ogata, Aromatic polyamide, Polym. Sci. 61 (1962) S49-S53.

DOI: 10.1002/pol.1962.1206117225

[2] J. Preston, F. Dobinson, New high temperature aromatic polyamides, J. Polym. Sci. Part B: Polymer Letters 2 (1964) 1171-1174.

DOI: 10.1002/pol.1964.110021219

[3] R.A. Dine-Hart, B.J.C. Moore and W.W. Wright, Aromatic polyamides, J. Polym. Sci. Part B: Polymer Letters 2 (1964) 369-373.

DOI: 10.1002/pol.1964.110020411

[4] J. Preston, New high temperature polymers. I. Wholly aromatic ordered copolyamides, J. Polym. Sci. Part A-1: Polym. Chem. 4 (1966) 529-539.

DOI: 10.1002/pol.1966.150040307

[5] F. Dobinson, J. Preston, New high-temperature polymers. II. Ordered aromatic copolyamides containing fused and multiple ring systems, J. Polym. Sci. Part A-1: Polym. Chem. 4 (1966) 2093-2105.

DOI: 10.1002/pol.1966.150040906

[6] R.S. Lenk, Post-nylon polyamides, J. Polym. Sci. Macromolecular Reviews 13 (1978) 355-387.

DOI: 10.1002/pol.1978.230130107

[7] Y. Zhang, Y. Huang and L. Liu, Effects of γ-ray radiation grafting on aramid fibers and its composites, Appl. Surf. Sci. 254 (2008) 3153-3161.

DOI: 10.1016/j.apsusc.2007.10.081

[8] C. Yue, K. Padmanabhan, Interfacial studies on surface modified Kevlar fibre/epoxy matrix composites, Composites Part B 30 (1999) 205-217.

DOI: 10.1016/s1359-8368(98)00053-5

[9] R.Q. Cai, T. Peng, F.D. Wang, G.D. Ye, J.J. Xu, Improvement of surface wettability and interfacial adhesion of poly-(p-phenylene terephthalamide) by incorporation of the polyamide benzimidazole segment, Appl. Surf. Sci. 257 (2011) 9562-9567.

DOI: 10.1016/j.apsusc.2011.06.064

[10] S.H. Zhang, G.Q. He, G.Z. Liang, H. Cui, W. Zhang, B. Wang, Comparison of F-12 aramid fiber with domestic armid fiber III on surface feature, Appl. Surf. Sci. 256 (2010) 2104-2109.

DOI: 10.1016/j.apsusc.2009.09.055

[11] C. Yue, G. Sui, H. Looi, Effects of heat treatment on the mechanical properties of Kevlar-29 fibre, Compos. Sci. Technol. 60 (2000) 421-427.

DOI: 10.1016/s0266-3538(99)00137-2

[12] Y. Rao, A. Waddon, R. Farris, The evolution of structure and properties in poly (< i> p</i>-phenylene terephthalamide) fibers, Polymer 42 (2001) 5925-5935.

DOI: 10.1016/s0032-3861(00)00906-x

[13] A. Hindeleh, S.M. Abdo, Effects of annealing on the crystallinity and microparacrystallite size of Kevlar 49 fibres, Polymer 30 (1989) 218-224.

DOI: 10.1016/0032-3861(89)90108-0

[14] S. Ran, D. Fang, X. Zong, B. Hsiao, B. Chu, P. Cunniff, Structural changes during deformation of Kevlar fibers via on-line synchrotron SAXS/WAXD techniques, Polymer 42 (2001) 1601-1612.

DOI: 10.1016/s0032-3861(00)00460-2

[15] A. Albert, R. Goldacre, J. Phillips, The strength of heterocyclic bases, J. Chem. Soc. 21 (1948) 2240-2249.

[16] K. Y. Wang, Y. Xiao, T. S. Chung, Chemically modified polybenzimidazole nanofiltration membrane for the separation of electrolytes and cephalexin, Chem. Eng. Sci. 61 (2006) 5807-5817.

DOI: 10.1016/j.ces.2006.04.031

[17] S.M. Aharoni, A.J. Signorelli, Electrical resistivity and ESCA studies on neutral poly (alkylbenzimidazoles), their salts, and complexes, J. Appl. Polym. Sci. 23 (1979) 2653-2660.

DOI: 10.1002/app.1979.070230910

[18] M.M. Coleman, D.J. Skrovanek, J. Hu, P.C. Painter, Hydrogen bonding in polymer blends. 1. FTIR studies of urethane-ether blends, Macromolecules 21 (1988) 59-65.

DOI: 10.1021/ma00179a014

[19] D.J. Skrovanek, P.C. Painter, M.M. Coleman, Hydrogen bonding in polymers. 2. Infrared temperature studies of nylon 11, Macromolecules Vol. 19 (1986) 699-705.

DOI: 10.1021/ma00157a037

[20] R. Bouchet, E. Siebert, Proton conduction in acid doped polybenzimidazole, Solid State Ionics 118 (1999) 287-299.

DOI: 10.1016/s0167-2738(98)00466-4

[21] A. Xia, G. Lü, X. Qiu, H. Guo, J. Zhao, M. Ding, L. Gao, Syntheses and properties of novel polyimides derived from 2‐(4‐Aminophenyl)‐5‐aminopyrimidine, J. Appl. Polym. Sci. 102 (2006) 5871-5876.

DOI: 10.1002/app.24988

[22] A. Xia, H. Guo, X. Qiu, M. Ding, L. Gao, Syntheses and properties of polyimides derived from diamines containing 2, 5‐disubstituted pyridine group, J. Appl. Polym. Sci. 102 (2006) 1844-1851.

DOI: 10.1002/app.24083

[23] S.Y. Kim, Synthesis and characterization of poly (amide imides) containing benzimidazole rings, Polym. Bull. 38 (1997) 627-634.

DOI: 10.1007/s002890050098

[24] Y. G. Baklagina, I. Milevskaya, N. Yefanova, A. Sidorovich, V. Zubkov, Structure of rigid chain polyimides based on the dianhydride of pyromellitic acid, Polymer Science USSR 18 (1976) 1417-1425.

DOI: 10.1016/0032-3950(76)90335-x