Effect of treatment pressure on structures and properties of PMIA fiber in supercritical carbon dioxide fluid

Abstract

The effects of treatment pressure on the structures and properties of PMIA fiber were investigated by Scanning electron microscopy, Dynamic wetting measurements, Fourier transform infrared spectrometry, X‐ray diffraction, thermogravimetric analysis, and mechanical properties test technology in supercritical carbon dioxide. The results indicated that the surface morphology, the water contact angle, the interaction of macromolecules, the crystal structure, the thermal property, and tensile strength of PMIA fibers were changed during supercritical carbon dioxide treatment, particularly the surface morphology and the wettability of fiber changed the most obviously with the increase of treatment pressure. Furthermore, the thermal property and tensile strength of treated PMIA fiber sample were improved in comparison with those of untreated sample. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41756.

An investigation for the performance of meta-aramid fiber blends treated in supercritical carbon dioxide fluid

“…However, the treated samples' surface was changed with the treatment temperature increasing in the supercritical carbon dioxide fluid, and more grooves and bulges appeared on the surface of the meta-aramid fiber blends as shown in Figure 2(c)-(f). The surface roughness of the treated fibers was increased obviously with increasing treatment temperature, probably due to the excellent mass transfer ability of the supercritical carbon dioxide fluid which can result in some changes of the surface morphology [21]. This was favorable for improvement of the interfacial adhesion and dyeability of the meta-aramid fiber blends.…”

“…Consequently, the diffraction intensities of treated samples were improved in the supercritical carbon dioxide fluid. However, the decrease tendencies for the diffraction intensity at 180 o C were probably because the defects of the macromolecular chains were destroyed in the process of the re-arrangement under the action of supercritical fluid [21].…”

Structure and properties of polyethylene terephthalate treated by supercritical CO2

“…Supercritical CO 2 dyeing, as an anhydrous process, presents low energy consumption, high uptake rate, recycling of dyes and CO 2 , as well as zero waste water emission in comparison with conventional water dyeing technique [1][2][3]. The economic and ecological benefits of supercritical CO 2 are derived from its density, which is intermediate between those of liquids and gases and which is continuously tuned by changes of temperature and/or pressure [4,5]. Therefore, considerable research activities have been conducted throughout the world since Professor E. Schollmeyer at Deutschen Textilforschungszentrum Nord-West in Germany put forward the patent of textile dyeing in supercritical fluid [3].…”

Investigations on the effect of carriers on meta-aramid fabric dyeing properties in supercritical carbon dioxide

“…However, a high degree of macromolecular orientation and dense crystal structure due to the numerous hydrogen bonds between amide groups in adjacent chains result in the extremely poor dyeability of meta-aramid ber. 21,22 Carrier, as a type of accelerant, is mainly used in the dyeing or printing of synthetic bers with disperse dyes by acting as a plasticising agent to reduce the glass transition temperature (T g ). 23 Theoretically, in the dyeing process, carrier can be absorbed by bers through polar and non-polar forces of interaction, hydrogen bonding and hydrophobic interaction.…”