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High‐modulus polyaramide and polybenzimidazole blend fibers
Author(s) -
Chung T. S.,
Herold F. K.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760312103
Subject(s) - materials science , composite material , ultimate tensile strength , modulus , spinning , fiber , polymer , dynamic mechanical analysis
Polymer blends from polybenzimidazoles (PBI) and high‐performance polyaramides were spun to give a PBI variant with better tensile properties than PBI itself. Infrared absorption spectra of a hot‐drawn fiber showed 10‐wavelength shift at the carbonyl band, CO, of high‐modulus polyaramide (HMA) due to an interaction of the CO with NH. Dynamic mechanical analysis (DMA) also confirmed the interaction is at a molecular level. The mechanical properties of hot‐drawn fibers from PBI/HMA polymer blends obey Halpin and‐Tsai's theory. Hot‐drawing “immediately after” dry‐spinning yielded fibers with impressive properties. Aging as‐spun PBI/HMA fibers was very harmful for fiber tensile properties. The effects of sulfonation and heat setting on fiber thermal and mechanical properties are also reported.