The effects of molecular weight of polycaprolactone(PLC) and the content of catalyst on the ester interchange reactions between poly(ethylene terphthalate)(PET) and PCL during melt blending were studied The ester interchange reactions between PET and PCL were characterized by $^{1}H$-NMR analysis and the P(ET/CL) copolymers were also characterized by DSC, SEM and X-ray analyses. The lower molecular weight of PCL and the higher level of catalyst content resulted in a higher degree of ester interchange reactions. It appears that the block characteristics, such as block length and randomness of P(ET/CL) copolymers from melt blending viaester interchange reactions, can be controlled by the molecular weight of PCL and the content of catalyst. These results may be applied to the other poly(aromatic/aliphatic) copymer systems prepared via melt blending. The melting and crystallization behavior, crystal structure and morphology of P(ET/CL) copolymers varied with the molecular weight of PCL and catalyst content due to different degrees of ester interchange reaction.

The glycerol, known as a hydrophillic plasticzer, was used for the improvement of brittle wool keratose films. The effect of glycerol contents, which were added to a soluble fraction of oxidized wool keratose, was examined on the structure and mechanical properties using circular dichroism spectropolarimeter, FTIR, X-ray diffractometer, and Instron. Circular dichroism showed that the addition of glycerol above 20% content induced the conformational change of keratose solution from ${\alpha}$-helix, and ${\beta}$-sheet structure. FTIR spectra and X-ray diffraction pattern also gave the evidence of conformational changes and showed that the relative intensity of characteristic ${\beta}$-sheet conformation peak of keratose film was increased with the addition of glycerol. The mechanical properties of keratose film were drastically changed in the case of above 16% of glycerol added. Especially, the elongation at break was increased from 1.1% to 18.2%, indicating the improvement of film flexibility. The mechanical properties are related to the moisture regain of keratose film; breaking strength and strain were decreased and increased, respectively, with an increase of moisture regain.

The effects of composition ratios of epoxy resin (EP) and polyurethane (PU) blends on cure kinetics and reheological properties were investigated. In this work, 20 phr of DDM (4,4'- diamino diphenyl methane) was used as a curing agent for epoxy resin. And the composition of EP/PU was varied within 100/0∼100/40 phr. The cure activation energies ($E_{a}$), which were obtained from dynamic DSC data by Kissinger method, were increased in 40 phr of PU in EP than in pure EP. The rheological properties of blend system were investigated under isothermal condition using a rheometer. Crosslinking activation energies ($E_{c}$) were also determined from the Arrhenius equation based on gel time and curing temperature. As a result, both gelaton time and crosslinking activation energy increased with increasling the content of PU. These results could be explained by the increase in reactivity between the hydroxyl group in EP and isocyanate group in PU, resulting in an increase in the crosslinking density.

Agricultural polyethylene mulching film containing a UV reflective additive which is known to exhibit insect repelling ability was manufactured. By measuring UV reflectance ratio($R_{A}/R_{B}$) which is known as a criterion for insect repellency, the optimum composition of mulching film was investigated. Also, the mechanical properties and the corresponding morphology of the above films were investigated. Tismo-D was used as a UV reflective additive and the composition of TIsmo-D in prepared mulching film was varied from 0 to 10 wt%. Meanwhile, in order to investigate the reproducibility of the film for mechanical properties, bulk samples with the identical compositions were also prepared and their mechanical property and morphology were analyzed. The maximum $R_{A}/R_{B}$ was obtained at 3 wt% Tismo-D, and maximum mechanical property were obtained at the same Tismo-D content.

Hollow yarn was produced in an experimental friction spinning apparatus by inserting hot-water soluble PVA filament in the center of the cotton yarn. A 61/18 denier (6.8 tex) PVA filaments were inserted in the core and cotton fibers were wrapped in the sheath. As the yarn in the filament core and cotton sheath had high tensile strength, good breaking elongation, and high work of rupture, higher processing efficiency could be achieved in those processes such as weaving, knitting, etc. After the production of this yarn, the hot-water soluble PVA filament in the core of the yarn was removed in boiling water with a good extraction efficiency of more than 95%. The tensile strength of the hollow yarn (after the extraction of PVA) did not change with the remobal of the PVA. However, the breaking elongation fo the hollow yarn with the higher filament proportion was larger than that of the cotton friction spun yarn. Work of rupture in the hollow yarn after boiling showed mostly the same level and increased a little by increasing the PVA proportion so that the work of the rupture the yarn with a larger hollow center sustained a slightly increased level compared with the yarn with a smaller hollow center. The twist density (number of twists per meter) inserted into the core spun yarn showed the highest level at 10% PVA proportion and it decreased as the PVA proportion was increased.

The microfiber knitted pile fabrics treated by antimicrobial finish (commercial tin and phenol compound) was studied. Two kinds of split-type nylon/polyester microfiber fabrics and one conventional filament fabric were treated with the solutions at various concentrations by pad-dry process. Antimicrobial activity, durability, and water-related transport properties of the finished fabrics were analyzed. Antimicrobial activity of the finished fabrics was evaluated by bacterial reduction (%). Excellent antimicrobial activity was obtained at very low concentration but the microfiber fabric pretreated with water-oil repellent agent showed antimicrobial activity at high concentration due to low % add-on. Microfiber fabrics finished at the specific concentration showed good durability to repeated laundering compared with the conventional filament fabric. No curing process at high temperature was necessary because a simple drying of the padded fabric at 50$^{\circ}C$ gave excellent durability to laundering. Also, durability to dry cleaning and bleaching, and stability to the heat of the finished microfiber fabrics were excellent. Intrinsic water-related properties of microfiber fabrics were little changed after antimicrobial finish. Therefore, the multifunctional microfiber fabrics with high water absorption and antimicrobial property were developed, which is good for hygienic end-use.

The trend of fashion, which was affected by historical event and culture, plays an important role in determining textile fabrication. The fabrication has been made not only by introducing the newly developed fiber but also by modifying the existing textile materials to impart sensibility to them. In this research, focusing on the latter case, we carried out the fabrication of women clothes specially for fall and winter. A survey on fashion trend through 1990s was made to forecast the fashion trend of 2000 years. Based on the forecasted trend, the fabrication in 2000 was expected to mostly use angora wool that possesses high luster, highly soft touch and highly wet look. However, angora wool is very expensive and thus, it is needed to introduce other fibers the properties of which are almost similar to those of angora. In this research, tencel fiber was introduced to substitute for angora wool. Tencel fabrics prepared were finished chemically with enzyme treatment and phsically with surface raising in a bid to impart to them sensitivity peculiar to angora. In order to characterize the imparted sensitivity, physical properties measured are compressibility, bending, tensile strain, surface properties, and etc. Result showed that the enzyme treated tencel fabric was much closer to the angora fabric than the enzyme untreated tencel fabric.