The dyeing properties of 100% PLA fabric and PLA/PET union fabric were examined with 4 different types of disperse dyes in this study. Disperse dyes were highly absorbed by PLA fiber in the temperature range of $100{\sim}110^{\circ}C$, K/S values of dyed PLA fabric with azo disperse dyes were much higher than those with anthraquinone dyes. It was found in the simultaneous dyeing of PLA and PET fabrics in the same bath that disperse dyes were mainly exhausted on PLA fiber at early stage of dyeing and migrated to PET fiber at the elevated dyeing temperature. Consequently K/S values of PET became higher as the dyeing temperature increased. Color differences appeared between PLA part and PET part in the union fabric dyed with 4 disperse dyes.

Polyhydroxyamide(PHA), a precursor polymer of polybenzoxazole(PBO), was synthesized by low temperature polymerization of 3,3'-dihydroxybenzidine(DHB) and isophthaloyl chloride(IPC) in N,N-dimethylacetamide (DMAc) medium. MWNT dispersions were prepared by ultrasonication of pristine MWNT(p-MWNT) and acid-modified MWNT(a-MWNT) in DMAc. PHA/a-MWNT and PHA/p-MWNT nanocomposite films were prepared by casting of mixed solution. The tensile properties of PHA/a-MWNT nanocomposite films were enhanced compared with those of pure PHA. DSC and TGA analyses revealed that the PHA/a-MWNT nanocomposites cyclized at lower temperature and showed better thermal stability compared to the pure PHA film.

The structure-property relation of para-aramid fibers heat-treated under various conditions was investigated. The effect of heat-treatment on the mechanical properties of the fibers was also studied. Tensile strength and strain at break decreased and tensile modulus increased with increasing heat-treatment temperature. Tensile modulus also increased with increasing draw ratio. Structural characterization was carried out by using wide angle X-ray scattering (WAXS) method. Both the apparent crystal sizes (ACS) measured from the broadening of reflection peaks of (004), (110) and (200) planes and the orientation angle obtained from azimuthal scan along the (200) direction were found to increase with increasing heat-treatment temperature and draw ratio.

Poly(L-lactic acid) (PLLA) filament fibers prepared by one-step melt spinning process with spin drawing were annealed at $100^{\circ}C$ and $120^{\circ}C$ and the effects of annealing on the crystal structure, crystallinity, and orientation of PLLA were studied by using synchrotron wide angle X-ray diffraction (WAXD) method. The PLLA SDY fibers of this study showed an ${\alpha}$-form crystal structure which was not affected by the annealing. The crystallity, crystallite size of the (200) plane of ${\alpha}$-form crystal, total orientation (${\Delta}n$), and crystalline orientation ($f_c$) increased with increasing annealing time up to 30 minutes at 100 and $120^{\circ}C$.

Composite fibers of polyacrylonitrile (PAN) and hydroxyapatite (HAp) were prepared through a wet-spinning process for the purpose of using as a sorbent which can remove harmful cadmium ions from wastewater or food. HAp could be well immobilized in the PAN matrix in the fibers up to 50 wt%. Highly porous structure could be obtained by direct extrusion of the dope to water as coagulant resulting in density of the fibers lower to 0.38 g/$cm^3$. Thus radial pore channels were found to be well developed through the fiber, which is essential key-structure for the effective diffusion of metal ions from water-phase to inside of the fibers. The composite fibers showed maximum cadmium sorption amount of 12.3 mg per g of fiber and 30.7 mg per g of HAp.

Poly(gylcolide-co-$\varepsilon$-caprolactone)(PGCL) was synthesized by bulk ring-opening polymerization of glycolide and $\varepsilon$-caprolactone using stannous octoate as a catalyst. Polymerization was conducted at a constant molar ratio of glycolidel-$\varepsilon$-caprolactone (55/45). The changes of copolymer chain structure according to the reaction conditions such as reaction time, temperature and catalyst feed ratio were studied by using $^1H$-NMR spectroscopy. The effects of reaction time and catalyst feed ratio on the chain microstructure of the final PGCL copolymers were found to be significant. The average sequence length of glycolyl segments in the copolymer decreased with transesterification during polymerization, which made PGCL microstructure more random.

Multi-chain surfactants usually form micelles more easily than single-chain surfactants due to their low surface tension and low solubility in water. In this study we prepared cotelomers of multi-alkylated nonionic surfactants with a molecular structure $xR_nMA$-yVA (x; hydrophobic group, y; hydrophilic group, MA; methacrylic ester, VA; vinyl alcohol, R; alkyl group) and investigated their properties as surfactants for the disperse dyeing of cellulose acetate, nylon 6, and PET fibers. Some cotelomers were synthesized via a radical polymerization of vinyl monomers MA and VA using azobisisobutyronitrile (AIBN) as an initiator. The ratio of x/y and degree of polymerization of $xR_nMA$-yVA with an alkyl chain length (n) of 4 or 6 were controlled by adjusting the ratio of thiol to monomers. We found that a cotelomer with a degree of polymerization 9.9 showed better dispersing performances than cotelomer with a degree of polymerization 4.4 or 12.5, and that the degree of dispersion increased to a certain level and then decreased as concentration of cotelomer increased. The highest value of dye uptake for the three fibers was obtained when using a cotelomer with a monomer unit ratio (x/y) of 0.2 and 0.5 g/l of concentration was 0.5 g/l.

The general RFID theory and principal of operations are reviewed, and the conductivities of the various electro-threads are analyzed. Based on the analyzed data, an embroidery tag antenna using the electro-thread is designed with the popular English character shape A. The embroidery RFID tag is easy to be embedded on a cloth as a wearable antenna. The embroidery tag is easy to be applied to general clothes. The characteristics and the reading range patterns of the tag antenna are measured. The reading distance of the A shape embroidery tag antenna is 1.2 meter at the maximum range.

The purposes of this study are to investigate the tactile sensibility and preference of cotton jersey before/after the treatment of softener washing finishing and to look for the relationship of tactile sensation and consumer preference, in order to provide the basic data for the development of new cotton products. We surveyed the tactile sensation and preferences of cotton jersey to 40 college students when asking them to handle $30{\times}30cm^2$ of fabric treated with/without finishing: Enzyme, Ultra soft, Silicone, and SBS washing finishing. All softener washing-finished fabrics were felt softer, flatter, more flexible, limper, moister, thinner, and more stretchable than before treatment, and consequently better feeling and higher preference. In case of thermal sensation, they felt that fabric with Enzyme finishing was cooler than before treatment, while other fabrics were warmer. And they felt Silicone and SBS finishing fabric were even lighter than before, while Enzyme and Ultra soft finishing were even heavier. Most preferred was SBS washing, but Silicone finishing fabric received the highest tactile comfort, this is for they received higher feelings in the sensations of smooth, soft, stretchy, thin, light and wet. We displayed the tactile sensation words and finishing types together on 2D scale of 'softness' X axes and 'heaviness' Y axes.

This study is to establish a conversion model of thermal insulation ratio of the range 44.9~95.5% to clo(KS K 0466, ASTM D 1518), which enables to evaluate the necessary thermal insulating ability. In order to obtain a suitable regression equation of models to convert thermal insulation ratio to clo, coefficients of determination on each section and total data were searched in advance on the basis of thermal insulation ratio, the sections that coefficients of determination were high were adopted. As regression equations on adopted sections were derived, the optimum regression equations were decided after making a regression diagnosis. Also, reliability verification by new samples about the optimum regression equations was conducted. Results of this research make it easy to convert thermal insulation ratio(%) to clo during new development and design of military or commercial winter clothes and sleeping bag. Also, reduction of development costs and period can be expected.