Synthesis and characterization of a rigid-rod dihydroxy poly(<Emphasis Type="Italic">p</Emphasis>-phenylene benzobisoxazole) fiber with excellent surface and axial compression properties |
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Authors: | Tao Zhang Sheng-Lin Yang Da-Yong Hu Jun-Hong Jin Guang Li Jian-Ming Jiang |
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Affiliation: | (1) State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, 201620, China |
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Abstract: | A series of dihydroxy poly(p-phenylene benzobisoxazole) (DHPBO) were prepared by introducing binary hydroxyl polar groups into poly(p-phenylene benzoxazole) PBO macromolecular chains and the effects of hydroxyl polar groups on surface wettability, interfacial
adhesion and axial compression property of PBO fiber were investigated. Contact angle measurement showed that the wetting
process both for water and for ethanol on DHPBO fibers were obviously shorter than that on PBO fibers, implying DHPBO fibers
have a higher surface free energy. Meanwhile, single fiber pull-out test showed that DHPBO fibers had higher interfacial shear
strength than that of PBO fibers. Scanning electron microscope proved that there was more resin remained on the surface of
DHPBO fibers than on PBO fibers after pull-out test. Furthermore, axial compression bending test showed that the introduction
of binary hydroxyl groups into macromolecular chains apparently improved the equivalent bending modulus of DHPBO fibers. |
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Keywords: | PBO fiber DHPBO fiber Contact angle Interfacial shear strength (IFSS) Axial compression properties |
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