2003, Vol.15, No.2

Textile Coloration and Finishing KCI Impact Factor : 0.0

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

PTT[poly(trimethylene terephthalate)] fiber was annealed by passing on the plate heater to illuminate the effects of annealing on the mechanical properties and dyeability with varying the treatment temperature for 0.5 second. The apparent crystal sizes and crystallinity were increased with increases in temperature. With the increases of the temperature, the dynamic viscoelastic behaviors were analyzed to be reduction in Tmax(tanδ). The initial modulus were observed to be a small enhanced. The shrinkage in hot water were reduced. The dyeability for disperse dye enhanced dramatically, for example, a satisfactory degree of exhaustion was obtained by dyeing at 95℃ for 30 min with the PTT fibers heat treated at 180℃.

In this work, ultrafiltration(UF) membranes were prepared using polyethersulfone(PES). The polymer was dissolved in various solvent, such as N,N-dimethyl formamide(DMF), N,-dimethyl acetamide (DMAc), N,N-dimethyl sulfoxide(DMSO) and N-methyl-2- pyrrolidone(NMP). Each polymer solution was casted on the glass plate, and immersed into non-solvent bath. In this way finely porous UF membranes were prepared by phase inversion method.The cross sectional structure of PES membrane was asymmetric which was consist of sponge-like sublayer, finger-like toplayer, and active skin layer. From the solute rejection experiments, the molecular weight cut off of the prepared membrane in various solvent was evaluated 10,000 for DMF, 30,000 for DMAc, 50,000 for DMSO, and 10,000 for NMP respectively.

In this study, a continuous stabilization process is used to make high-performance carbon fiber from polyacrylonitrile(PAN)-based fibers. The effect of oxygen content of PAN-based fibers on the stabilization process and the properties of the resultant carbon fibers is investigated. In order to research the progress of stabilization reaction, FT-IR, elemental analysis, density, DSC, etc are used.Stabilization is carried out in air atmosphere from the 200 to 300℃ temperature range.An increase of PAN-based fibers diameter reduces the oxygen content during the continuous stabilization process. A higher oxygen content increase the density, tensile strength and modulus in the resultant carbon fibers.The most appropriate oxygen content in the stabilized fiber should be about 12%. Fibers having more than 12% oxygen content yield carbon fibers with inferior properties. Those carbon fibers also have sufficient commercial availability.