• 방사선산업학회지
• /
• 제6권1호
• /
• pp.55-59
• /
• 2012

Polyacrylonitrile (PAN)-based carbon fibers have been widely used due to their unique chemical, electrical, and mechanical properties. Electron beam irradiation has been extensively employed as means of altering properties of polymeric materials. Electron beam irradiation can induce chemical reactions in materials without any catalyst. Electron beam irradiation may be useful in accelerating the thermal compression stabilization of PAN nanofibers. To investigate the irradiation effect on PAN fibers, PAN nanofibers were irradiated by electron beam at 1,000~5,000 kGy. Irradiated and non-irradiated PAN nanofibers were heated at 180 and $220^{\circ}C$ without applying pressure for 15 min. Then 1 metric ton has been applied for 5 min. SEM images have been found that the fiber kept its morphological behavior after the hot pressing up to electron beam irradiated 1,000 kGy. DSC thermograms showed that the peak temperatures of the exothermic reactions were found to decrease with increasing electron beam irradiation doses and temperature. FT-IR spectra have been found to decrease $C{\equiv}N$ stretch band with increasing the electron beam irradiation dose. These results indicate that the modification of PAN via reactions such as cyclization is significantly enhanced by electron beam irradiation and thermal compression technique.

• Fibers and Polymers
• /
• 제7권2호
• /
• pp.203-212
• /
• 2006

The purpose of this study was to examine the effects of the structural properties of plain knit fabrics on the subjective perception of textures, sensibilities, and preference among consumers. This study, then, aimed to provide useful information with respect to planning and designing knitted fabrics by predicting the subjective characteristics analyzed according to their structural properties. For this purpose, we employed statistical analysis tools, such as factor and regression analysis and an adaptive-network-based fuzzy inference system(ANFIS), thereby combining the merits of fuzzy and neural networks and presupposing a non-linear relationship. Through factor analysis, we also categorized the subjective textures into 'roughness', 'softness', 'bulkiness' and 'stretch-ability' with R2=70.32%: and categorized the sensibilities into 'Stable/Neat', 'Natural/Comfortable' and 'Feminine/Elegant' with R2=68.12%. We analyzed subjective textures, sensibilities, and preference with ANFIS, assuming non-linear relationships; consequently, we were able to generate three or four fuzzy rules using wool/rayon fiber content and loop length as input data. The textures of roughness and softness exhibited a linear relationship, but other subjective characteristics demonstrated a non-linear input-output relationship. Compared with linear regression analysis, the ANFIS exhibited had higher predictive power with respect to predicting subjective characteristics.

• 한국의상디자인학회지
• /
• 제12권1호
• /
• pp.89-101
• /
• 2010

The purpose of this study was to investigate the fashion item of the symbolic fashion icons in the 20th century. The symbolism of fashion icons was grouped into four classes according to the influence of a social-cultural change. 1. Icons between dream and reality: A dreary emotion that was caused by material richness has a longing for an ideal image. A typical style was Art Nouveau style, which pressed into a grotesque S-bend. While as the world placed on a economic reconstruction after World War I, rational fashion icon which pursued more function and simplify than cumbersome style and complexity came out. 2. Icons between solid and liquid: A solid icons was connected with a mode of female body during World War 1. This extremely stylized female figure. Flowing fabrics enveloped the stylized female figure and they brought a liquid icons into relief. 3. Icons between uniformity and variety: At a time when uniformity was appeared strongly within 20th century is during World War II and about 1940-1950. The uniformal icon was classified into uniformity by uniform and by mass production. A repugnance for the uniformity and imitation of fashion was tried a new fashion style. It could be called with the various of fashion icon. 4. Icons between social secession and rediscovery: In 1950-1960, 1970-1990, and the end of 20th century, the advent of the young culture was born a consumer who newly breaks in fashion. It could be included within the domain of social secession icon. While the rediscovery of fashion icon was associated with experimental new fibers, leotard, suitable replacement for wool or acrylic knit, silk that could stretch in any direction, new fabrics that were transparent, took color beautifully, and could be painted, tie-dyed, or embroidered.

• 한국염색가공학회지
• /
• 제21권1호
• /
• pp.38-45
• /
• 2009

First of all, the properties imparted to PET fabrics are resistance to and recovery from creasing or wrinkling when wet or dry; high resistance to stretch in the filament yarns but not in the staple; high abrasion resistance; good texture and appearance; resistance to heat ageing; good chemical resistance and good resistance, behind glass, to sunlight. But, the low moisture regain of PET fabric conduces to static troubles in textile processing. Furthermore, garments made from PET may, during wear, develop electric charges which attract to the fabric particles of soil(dirt, swarf, dust) flying in the air, so that the cuffs of shirts, for example, become soiled quickly and are not easily laundered clean. The sericin constitutes 25$\sim$30％ of silk protein and surrounds the fibroin fiber with sticky layer that supports the formation of a cocoon. The useful biochemical properties of sericin protein are oxidation resistant, antibacterial, UV resistant, hydrophilic property, and good affinity with hydrophobic material. These properties can be used as an improving reagent or a coating agent for natural and synthetic fibers, fabrics, and other intermediate products. The sericin is also applied to cross-link, and can be blended with other materials. In this study, we modified the surface of PET fabric by mixture of sericin finishing agent; sericin, polyuretane binder and 1,2,3,4-butanetetracarboxylic acid (BTCA) cross-link agent. Also, we investigated the finshing effect; moisture regain, stiffness, handle, drape and electrostatic. The moisture regain of PET fabric treated with sericin finishing agent was higher than that of untreated PET fabric. As a result of evaluating influence about handle of PET fabrics treated with sericin finishing agent, it was confirmed that the sericin finishing agent could be use as a linen like finishing agent.

• 전기화학회지
• /
• 제24권4호
• /
• pp.93-99
• /
• 2021

스트레처블 에너지 저장 장치 경량화를 위해 금속 집전체를 대체할 경량 물질 개발에 대한 관심이 높아지고 있다. 본 연구에서는 전도성 고분자인 PEDOT:PSS를 전기방사법으로 제조한 나노 섬유를 리튬이온전지용 집전체로 사용하였다. 나노 섬유는 도펀트인 DMSO를 사용해 향상된 전기 전도성을 나타냈으며, 신축성 평가결과로 부터 30% 이상의 신축률을 보여주었다. 또한, 나노 섬유 집전체를 사용함으로써 액체 전해질의 침투가 용이하며, 나노 섬유 네트워크를 통해 전자전도성을 높이는 효과를 나타났었다. DMSO 도핑 PEDOT:PSS@PAM 나노 섬유 필름 집전체를 사용한 리튬이온전지는 135mAh g^-1의 높은 방전용량을 보여주었으며, 1000 사이클 이후 73.5%의 높은 용량 유지율을 나타내었다. 따라서, 전도성 나노 섬유의 우수한 전기화학적 안정성과 기계적 특성은 신축성 에너지 저장 장치의 경량 집전체로서의 활용이 가능함을 보여주었다.

• 한국의류학회지
• /
• 제29권12호
• /
• pp.1619-1626
• /
• 2005

탄성직물의 내구성은 탄성직물에 포함된 스판덱스사의 성질변화가 큰 영향을 미친다. 그러므로 본 연구에서는 세탁조건이 스판덱스사의 길이, 강도와 신도, $300\%$신장 후의 영구탄성 변화에 미치는 영향을 조사하였다. 시료로는 굵기가 다른 스판덱스사와 heat-set 시 신장률이 다른 편성물을 가정용 드림세탁기에서 세탁온도, 세탁 전 침지시간과 세탁휫수를 달리하여 세탁한 후, 편성물로부터 스판덱스사를 분리하여 기계적 성질을 측정하였다 스판덱스사의 길이는 세탁온도가 높아지거나, $40\%$에서 세탁휫수가 증가하면 계속 감소하였으나 세탁 전 침지시간에 따른 영향은 비교적 적었다 섬유가 가늘수록 길이 수축률이 크며 세척 조건변화에 따른 수축률이 크게 증가하였다. 스판덱스사의 강도와 신도는 반복 세척 시의 감소가 뚜렷하였으며, heat-set 시에는 강도와 신도도 크게 감소하였고, heat-set 시에 가해준 신장률이 클수록 감소가 더 컸다. 한편 스판덱스사의 영구변형률은 세탁온도가 높으며, 침지시간이 길고, 세탁횟수가 많을 때 현저히 높았다. 대체적으로 굵은 스판덱스사의 영구변형률이 크며, 140D는 30회 세척 후에 $28.0\%$의 영구변형 이 일어났다. Heat-set로 스판덱스사의 영구변형은 늘어나며, heat-set 시에 신장률이 큰 스판덱스사의 영구변형이 더 많았다. DSC 열분석 곡선에서 스판덱스 섬유는 반복 세탁과 heat-set여부와 관계없이 동일한 융해온도를 나타내었으며, 이로부터 스판덱스 섬유의 hard segment분자쇄 길이는 세탁 또는 heat-set후에도 변화가 없는 것으로 보여진다.