2015, Vol.27, No.1

Textile Coloration and Finishing KCI Impact Factor : 0.0

pISSN : 1229-0033 / eISSN : 2234-036X
https://journal.kci.go.kr/ksdf

The aim of the current study is to identify the dimerization and decomposition kinetics of the F-DM type. The regeneration of F-VS from FiFj-DM or the reversibility of the dimerizations were investigated. The order of real rateconstants of the dimerization(′ Dij) would seem to be similar to that of rate constants of a dimerization( Dij) for VS dyesat a given pH because of the constancy of the equilibrium constants( aj-value). The reverse reactions of the DM typesare appeared to occur in two steps, the deprotonation of α-carbon of the DM types and disproportionation. The ratio ofthe decomposition of the DM type to F-Hy and F-VS appears to be related with the ratio of i/ j. Similarities werealso found among various other reactions, including homo- and mixed dimerization. VS dyes undergoing fast hydrolysishave difficulty in forming a dimer. The higher the reactivity with cellulose or hydroxide ion, the smaller thedimerization. The easiness of the dimerization was thus found to be inversely proportional to the rate of hydrolysis.

Recently, super fiber reinforced composite materials are widely used in many industries due to high mechanicalproperties. In this study, 2 different types of composite materials were manufactured in order to compare their mechanicalproperties. Carbon and Aramid fibers were used for reinforcement materials and Bisphenol-A type epoxy resin was formatrix. Two kinds of fiber-reinforced materials were manufactured by RIM(Resin Injection Molding) method. Beforemanufacturing composite materials, the optimal manufacturing and curing process condition were established and the ratioof reinforcement to epoxy resin was discussed. FT-IR analysis was conducted to clarify the structure of epoxy resin. Thermaland mechanical property test were also carried out. The cross-section of composite materials was observed using a scanningelectron microscope(SEM).

Para-aramid fibers were treated by atmosphere air plasma to improve the interfacial adhesion. The wettability ofplasma-treated aramid fiber was observed by means of dynamic contact angle surface free energy measurement. Surfaceroughness were investigated with the help of scanning electron microscopy and atomic force microscopy. The tensile test ofaramid fiber roving was carried out to determine the effect of plasma surface treatments on the mechanical properties of thefibers. A pull-out force test was carried out to observe the interfacial adhesion effect with matrix material. It was found thatsurface modification and a chemical component ratio of the aramid fibers improved wettability and adhesion characterization. After oxygen plasma, it was indicated that modified the surface roughness of aramid fiber increased mechanical interlockingbetween the fiber surface and vinylester resin. Consequently the oxygen plasma treatment is able to improve fiber-matrixadhesion through excited functional group and etching effect on fiber surface.