• 한국의류학회지
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• 제32권7호
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• pp.1056-1064
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• 2008

Toes socks are used widely for the health of feet. However, discomfort is one of the major complains from toes socks users. The purpose of this study is to determine the effect of functional fibers on the physiological response and wearing sensation of toes socks. For experiment, two different toes socks with cotton/warm fiber(WS) and cotton/chitosan fiber(CS) were knitted automatically by a computer controlled flat knitting machine. The control toes socks with cotton/nylon/polyurethan(TS) were prepared to compare the properties. Experiments were conducted in a climate room of $16\pm2^{\circ}C$, $50\pm5%$ R.H. The results of this study were as follows. The change of heart rate, pulse rate, and mean skin temperature showed no difference among three different socks. However, skin temperature of TS was evaluated higher than that of WS and CS. After exercise wearing WS both instep temperature and sole temperature of women tend to higher compared to men. Wet sensation and overall comfort sensation of toes socks were significantly influenced by different fiber contents. Subjects evaluated WS and CS more comfortable than TS.

• 한국의류산업학회지
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• 제24권6호
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• pp.812-824
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• 2022

This study proposes to develop a 3D printed re-entrant(RE) strip by shape memory thermoplastic polyurethane that can be deformed and recovered by thermal stimulation. The most suitable 3D printing infill density condition and temperature condition during shape recovery for mechanical behavior were confirmed. As the poisson's ratio indicated, the higher the recovery temperature, the closer the poisson's ratio to zero and the better the auxetic properties. After recovery testing for five minutes, it appeared that the shape recovery ratio was the highest at 70℃. The temperature range when the shape recovery ratio appeared to be more than 90% was a recovery temperature of more than 50℃ and 60℃ when deformed under a constant load of 100 gf and 300 gf, respectively. This indicated that further deformation occurred after maximum recovery when recovered at a temperature of 80℃, which is above the glass transition temperature range. As for REstrip by infill density, a shape recovery properties of 100% was superior than 50%. Additionally, as the re-entrant structure exhibited a shape recovery ratio of more than 90%, and exhibited auxetic properties. It was confirmed that the infill density condition of 100% and the temperature condition of 70℃ are suitable for REstrips for applying the actuator.

• 폴리머
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• 제33권6호
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• pp.569-574
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• 2009

수분산 PUD 필름의 내스크래치 특성을 개선하기 위해서 카보네이트(PCD), 에스터(PCL), 실옥산(PDSBP)형의 폴리올을 혼성하여 유-무기 하이브리드 수분산 폴리우레탄(PUD)을 합성하였다. 선형구조(Linear type)의 PUD보다 그래프트형(graft type)의 PUD가 유화입경이 커지는 경향이며, 이는 소수성의 실옥산 그래프트 구조에 기인된다고 생각된다. 합성 PUD의 열적성질은 linear type의 PUD는 PCD의 함량이 증가할수록 유리전이온도($T_g$)는 증가하였으며, 열분해온도는 감소하였다. 반면에, graft type PUD는 PDSBP의 양이 증가할수록 $T_g$는 감소하였고, 열분해온도는 거의 유사하였다. Graft type PUD는 PDSBP의 함량이 증가할수록 내스크래치 특성 및 hardness는 향상되는 경향을 보였다. 9 wt%의 PDSBP 폴리올이 혼성된 경우, 3.3 N의 내스크래치 특성과 9 H 이상의 연필경도를 가지는 우수한 PUD 필름을 얻을 수 있었다.

• 한국의류산업학회지
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• 제24권1호
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• pp.146-155
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• 2022

We proposed a simple process of creating electroconductive textiles by using PEDOT:PSS(Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate))/non-oxidized graphene to coat polyamide or polyurethane knitted fabric for smart healthcare purposes. Electroconductive textiles were obtained through a coating process that used different amounts of PEDOT:PSS/non-oxidized graphene solutions on polyamide/polyurethane knitted fabric. Subsequently, the surface, electrical, chemical, weight change, and elongation properties were evaluated according to the ratio of PEDOT:PSS/non-oxidized graphene composite(1.3 wt%:1.0 wt%; 1.3 wt%:0.6 wt%; 1.3 wt%:0.3 wt%) and the number of applications(once, twice, or thrice). The specimens' surface morphology was observed by FE-SEM. Further, their chemical structures were characterized using FTIR and Raman spectroscopy. The electrical properties measurement (sheet resistance) of the specimens, which was conducted by four-point contacts, shows the increase in conductivity with non-oxidized graphene and the number of applications in the composite system. Moreover, a test of the fabrics' mechanical properties shows that PEDOT:PSS/non-oxidized graphene-treated fabrics exhibited less elongation and better ability to recover their original length than untreated samples. Furthermore, the PEDOT:PSS/non-oxidized graphene polyamide/polyurethane knitted fabric was tested by performing tensile operations 1,000 times with a tensile strength of 20%; Consequently, sensors maintained a constant resistance without noticeable damage. This indicates that PEDOT:PSS/non-oxidized graphene strain sensors have sufficient durability and conductivity to be used as smart wearable devices.

• 한국의상디자인학회지
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• 제1권1호
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• pp.127-139
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• 1999

The purpose of this study was to understand the preference of fashion materials according to the degree of consciousness and satisfaction of body. A survey was conducted using the randomly selected 439 woman students in the twenties. The consciousness variable had three levels which were lean, medium, and obese shape for each whole, upper and lower body with self-consciousness. Also, satisfaction variable had three levels which were satisfying, average, and unsatisfying group. We analyzed the data using analysis of correlation, crosstabulation analysis, and analysis of variance including Duncan multiple test. The results were as follows: 1) There was the positive correlation between height, leg, and arm length, and each variable, and the negative correlation between back, hip, thigh, waist, lower leg, ankle, and upper arm, and each variable. Also, we could observe the pattern that the larger the head or the more the weight was, the lower the satisfaction of body was. 2) There were no strong correlation between breast and hand size and each variable. From the crossed classification, we could observe the trend that the smaller the breast was, the lower the satisfaction of body was. 3) There were the strong correlation between whole and upper body in consciousness degree and between whole and lower body in satisfaction. 4) The consciousness of the whole body was shown lean shape 23.4%. medium shape 49.2%, and obese shape 27.2%. For the satisfaction degree of the whole body, satisfaction was shown 6.8%, average 41.7% and unsatisfaction 51.4%, so the satisfaction group is very small. 5) From the analysis for the consciousness degree of the whole body, the preferred fashion materials were polyester and acetate in casual wear, linen, polyester, acryl, T/W, and polyurethan in formal wear, and cotton, nylon, TIC, and T/W in sports wear. There was significant difference in casual wear, formal wear, and sports wear, but, not in underwear and accessories among he consciousness groups. 6) From the analysis for the satisfaction degree of the whole body, the preferred fashion materials were linen, silk, and acetate in casual wear, cotton in underwear, polyurethane in formal wear, and nylon in sports wear. There was the significant difference in casual wear, underwear, formal wear and sports wear, but, not in accessories among the satisfaction groups.

• 한국응용과학기술학회지
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• 제31권1호
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• pp.74-82
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• 2014

본 연구에서는 $H_{12}MDI$(4,4'-methylene dicyclohexyl diisocyanate)를 이용한 수분산 폴리우레탄 수지를 합성한 다음 방염제로 활용이 되고 있는 2-인산암모늄(ammonium dihydrogen phosphate) 수용액을 수분산 우레탄 수지에 적하량을 점차 증가시켜 변화하는 물성을 피혁(leather)에 표면 코팅처리된 상태 및 열풍 건조시킨 필름의 물성을 측정 분석하였다. 내용제성 측정 결과 높은 내용제성 물성을 지닌 폴리우레탄 수지에 2-인산암모늄의 함량에 따른 물성적 변화는 크게 없었으며 모두 높은 물성치를 나타내었다. 인장 강도 측정치에서는 폴리우레탄 단독 필름의 측정치가 $3.114kg_f/mm^2$로 가장 높은 수치를 나타내었으며, 2-인산암모늄의 합량이 제일 높은 DPU-AD3가 가장 낮은 인장력 $2.510kg_f/mm^2$을 나타내었다. 또한 내마모도 측정에서는 DPU가 제일 높은 50.50 mg.loss로 우수한 물성변화를 나타내었고, 연실율의 경우역시 우레탄 단독 코팅인 DPU가 602 %로 가장 높은 수치를 나타내었다. DSC측정결과 2-인산암모늄의 함유가 높은 DPU-AD3이 Tm 값이 $384^{\circ}C$로 고온에서 가장 안정한 수치를 나타내었다.