In order to develop dyeable polypropylene fibers, polypropylene-polar polymer blends and their blend fibers, which were prepared via melt blending of polypropylene(PP) with ethylene-vinyl acetate copolymer containing 28 wt% of vinyl acetate(EYA(28)) and 38 wt% of vinyl acetate (EVA(38)) and phenolic resin novolac (PRN), at various compositions, were studied. Solubility parameter, thermal property, flow behavior. mechanical property, morphology, and miscibility of the blends were investigated. The blends of PP/EVA(28) exhibited enough compatibility to give a blend having no clear phase seperation and had excellent fiber forming ability. It was found that additive polymers could be dispersed without phase separation in the order of EVA(28) > EVA(38) > PRN and they affected the mechanical properties of PP. PP/EVA(38) and PP/PRN blends showed considerable decrease in flow and mechanical properties compared to those of pure PP. But PP/EVA(28) blends did not show property.

In order to develop dyeable polypropylene fibers, polypropylene-polar polymer blends and their blend fibers, which were prepared via melt blending of polypropylene(PP) with ethylene-vinyl acetate copolymer containing 28 wt% of vinyl acetate (E77(28)) and 38 wt% of vinyl acetate (EVA(38)) and phenolic resin novolac (PRN), at various compositions, were studied. Crystallite size, orientation, and dynamic mechanical properties of the blend fibers were investigated. Apparent dye adsorption (K/S value) and dyeing fastness were measured. Especially PP/EVA(28) blend fiber exhibited mechanical properties as high as those of PP fibers. K/S values were increased with increasing EVA content up to 7 wt% dependent on the chemical structure of dyes. Red dye was adsorbed much more than blue and yellow dyes due to the affinity between dye and fibers. Washing and light fastness was excellent and comparable to polyester.

Nanocomposites of poly(ι-lactide) (PLA) and organosilicate were prepared using a melt mixing method. PLA nanocomposites with partially exfoliated structure can be prepared, only when an organic modifier present in organosilicates, Cloisite 30B. in this study, interacts favorably with PLA. The partially exfoliated silicate layers increase the crystallization rate of PLA and dynamic storage moduli of PLA below the T$_{g}$ of PLA. However, the increase in crystallization rate and storage moduli is also accompanied by the formation of low molecular weight oligomers of PLA during sample preparation, verified by GPC measurement. As the content of 303 increases the tonsils modulus of PLA/30B nanocomposites increases but the tensile strength and the strain at break decrease. The drop is attributed to the formation of non-exfoliated aggregates at higher organosilicate contents. the insufficient adhesion between PLA and silicate layers, and the formation of PLA oligomers.s.

The segmented and block copolymers of poly(L-lactide-co-p-dioxanone)(PDO) and L-lac-tide were prepared successfully by ring-opening polymerization in the presence of lauryl alcohol with stannous octoate catalyst. The products were characterized by SEM, $^1$H-NMR, $^{13}$ C-NMR, and scanning electron microscopy. The hydrolytic degradation of copolymers was studied in a phosphate buffer solution at pH=7.4 and 37$^{\circ}C$. The degradation behavior was evaluated by analyzing the morphological changes. The weight loss, pH, and inherent viscosity changes suggested diffusion of low molecular weight chain segments into the reaction medium as a consequence of the cleavage of ester bonds On the material. Surface morphological changes observed using SEM suggest a heterogeneous degradation mechanism.

Unoriented iodinated films (IBC films) were prepared by casting aqueous solutions of 10 wt% poly(vinyl alcohol)(PVA) containing selected quantities of I$_2$/KI. The quantity of I$_2$/KI was controlled to obtain 15.2, 79.8, 83.2, 117.0, and 140.1% weight gains. The structure of the films before and after deiodination was investigated by thermogravimetry(TG), X-ray differaction analysis, differential scanning calorimetry(DSC), and dynamic mechanical thermal analyser(DMTA). The TG curves of IBC films exhibited three distinct zones of weight loss corresponding to the evaporation of $H_2O$ and I$_2$ molecules (zone I), evaporation of I$_2$ and partial decomposition of side groups(-OH)(zone II), degradation of the remaining side groups and partial degradation of main chain(zone III-1 ), and desradation of the remaining main chain and char zone corresponding to KI, which is similar to films iodinated after casting(IAC films). But the weight loss of zone I is lower and the percent of char is higher than those of the IAC film. The crystalline structure of film with weight gain of 15.2% was silmilar to that of a pure PVA, structure of films of weight gain of 77.8~117.% gradually became similar to that of IAC film with increasing weight gain, but the film with weight gain of 140.1% was almost amorphous. The DSC thermograms of IBC films with weight gains of 15.2 and 39.8% indicated endothermic single or double peaks at around 180 $^{\circ}C$ correlponding to the crystal melting and degradation of side groups, those with weight gains of 83.2% and over indicated exothermic peak at around 17$0^{\circ}C$ which may be corresponding to crystallization, and broad endothermic peak at around 180~20$0^{\circ}C$ corresponding to the crystal melting and degradation of side groups. The dynamic mechanical un transition of the IBC film with weight gains of 140.1% appeared around 2$0^{\circ}C$. X-ray diffraction and DSC analysis of deiodinated films showed that the crystal struoture on deiodination of all IBC films, regardless of crystallinity, returned to that of the pure PVA films.

Polypropylene(PP) and nylon 6 were extruded on a single screw extruder. Nylon 6 could disperse in an ellipsoidal form in the PP matrix. When the blends were compression-molded at a temperature between the melting temperature of PP and that of nylon 6, these ellipsoids were ma ntained in the matrix. While the elastic recovery was improved by the existence of nylon 6 ellipsoids, the tensile strength of the blend decreased. Differential scanning calorimetry(DSC) analysis showed that nylon 6 ellipsoids could affect the crystallization behavior of PP slightly. To see if the above results could also be obtained in PP/nylon 6 blend filaments, the mechanical properties, the morphology, and the melting and crystallization of the blend filaments were investigated in this study.

Recently, structural adhesives and fiber composites are used in many structural components. Rubber-modified epoxy resins are employed as adhesives and matrix materials for various engineering components. This study focused on the relationship between fracture toughness and damage Brine size around the crack tip of rubber-modified epoxy resin under mixed mode conditions. Fracture toughness(K$_{IC}$) and fracture energy(G$_{c}$) were evaluated using the end notched circle type(ENC) specimens. The damage zone and rubber particles distributed around the crack tip of damaged specimens were also observed on an optical microscope. It is concluded that G$_{c}$ of rubber-modified epoxy resin is closely related to the area of the damage zone. The rubber particles are deformed elliptically due to the difference in principal stresses in the case when the loading angle is 30 degrees.grees.

The hybrid system based on the stochastic and wavelet analyses was applied to a large amount of data from an actual yarn manufacturing process, and the performance was verified by applying the system developed. Ten yarn packages were measured on a Shlafhors $t_{R}$ open-end spinning machine at normal production conditions, providing data for a total of length of 250,000 m, or 25,000 m for each package. The massive amount of data could be reduced to a small fraction consisting of i) a set of statistical parameters for normal sub-blocks, ii) sets of statistical parameters on abnormal sub-blocks for characterizing yam and fabric defects and for providing their timedomain addresses, and iii) wavelet coefficients for abnormal sub-blocks. The reduction rate was approximately 99.9999% in the example at which 100 spindles could be monitored for 10 hours by storing only a small fraction of the data.a.

The characteristics of hot air drying in the drying chamber of a sizing machine was numerically analyzed with respect to operating and ambient conditions. The results showed that the proposed model described Qualitatively the behavior of drying process of sized yarns in the drying chamber of a sizing machine well. The drying rate and moisture content of sized yarn were strongly dependent on the air temperature, humidity, and mass flow rate. From parametric studies, the optimal operating conditions were searched and obtained under given input and ambient conditions.

Yarn formation process consists of several sequential unit processes and the ring process Is the final stage determining the product quality and the manufacturing cost that outweighs other unit processes. Therefore the technological developments on the ring spinning method are focusing on the improvement of spinning speed and high quality product. But these technological targets are limited by the fact that the spinning tension increases excessively due to the friction between the running yarn and the traveller, including the friction between the traveller and the ring as well. This research was conducted in order to obtain the behavior of the yarn spinning tension that is variable during cops building. The results showed that the spinning tension changed reciprocally to the yarn forming diameter of the cop on the ring frame and in a quadratic form to the ring rail position. In addition, the research suggested that a zone of ring-rail position existed where the spinning tension reached, a minimum throughout the ring diameter. The spinning tension changes drasticallg when the process begins, i.e., for the small diameter of the cops.

Polypyrrole (PPy) was Polymerized chemically and electrochemically in sequence on nylon 6 woven fabrics, to obtain Polypyrrole-nylon 6 composite fabrics (PPy-N) with high electrical conductivity. The electrochemical polymerization (ECP) process was carried out in an electrolyte solution, where the composite fabrics prepared by chemical oxidative polymerization (COP) and stainless steel plates were used as the working and the counter electrodes respectively, at room temperature for 2 hours under a constantly applied current density. Effects of polymerization conditions of COP and ECP on the properties of the resulting composite fabrics such as electrical conductivity and electromagnetic interference shielding efficiency (EMI SE) and other characteristics were investigated. The electrical conductivity of PPy-N was approximately 10 S/cm and EMI SE was in the range of 5~40 dB depending on the conductivity and thickness. The physical properties of the matrix were affected by the incorporation of the conducting polymer into the matrix and were not changed during COP.

Phase change material(PCM), eicosane, was microencapsulated by complex coacervation between gelatin and arabic gum. PCM microcapsules were characterized by FT-lR, optical and scanning electron microscopy, image analyzer, and differential scanning calorimetry. PCM microcapsules in slurry state were spherical. Spray-drying method was the most effective in obtaining spherical microcapsules. The mean particle size of PCM microcapsules decreased with addition of s surfactant, and increased with increase in the volume of eicosane and the formation temperature of coacervate. However, it was not dependent on the emulsification speed above 3,000 rpm. Spherical microcapsules gave higher filling ratios.

To get the basic data for the assessment of clothing comfort and to examine the seasonal changes of clothing microclimate, skin temperature, subjective sensation, and clothing microclimate were measured from 10 males and 10 females in each of the seasons. The subjects were questioned on thermal comfort in the experiment. Clothing microclimate temperature (temperature between skin and the garment) at breast, skin temperature at four sites (breast, upper arm, thigh, leg). tympanic temperature as deep body temperature, and subjective sensation were measured for an hour in the climatic chamber. Summer recorded the highest mean skin temperature. Throughout the seasons, mean skin temperature was 33.51$^{\circ}C$ in males and 33.55 $^{\circ}C$ in females. There was no significant difference between summer and fall in clothing microclimate. Temperature of clothing microclimate was 32.4 $\pm$ 0.8 $^{\circ}C$ in males and 32.9$\pm$ 1.8$^{\circ}C$ in females throughout the seasons and it was higher in winter than in any other season. Subjects were the most comfortable when clothing microclimate temperature was 32.6$\pm$ 1.3 $^{\circ}C$. Mean humidity of clothing microclimate was 51.6$\pm$ 14.3% throughout four seasons. From the results, Koreans appear to feel comfortable at standard microclimate humidity, but at higher temperature than standard clothing microclimate temperature .

Grading is to alter sample size patterns into different sizes. The know-how of grading is based on the understanding of dimensional variations of different sizes. The purpose of this studs is to develop a grading increments chart for women's wear focusing on dimensional variations among groups of different ages, heights, and drop values. We approached the research purpose in two ways. Statistical analysis was focused on dimensional variations among groups of different ages. heights, and drop values. Specialists interviews were carried out with shop masters, graders, and pattern engineers. Specialists interviews verified the feasibility of this grading increments chart. As a result the grading increments chart was developed as follows. 1. Size codes and control dimensions of the chart are matched with KS size code. 2. Covering range and reference dimensions are analysed in separate age groups. 3. Basic increments were analysed in the medium height groups. For short or tall group, necessary dimensional increments were suggested. 4. Also for different figure types, which were presented as drop values, necessary dimensional increments were suggested. 'H-B' is the value of hip girth minus bust girth, and 'H-W' is the value of hip girth minus waist girth.