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PVA 처리에 따른 해도형 나일론 극세사 부직포 인조피혁의 특성 분석
남택욱,이필규,이재민,이유림,이승구,Nam, Taek Uk,Lee, Pil Gyu,Lee, Jaemin,Lee, Yu Rim,Lee, Seung Goo 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.3
In this study, a leatherette was manufactured using sea-island type nonwoven nylon microfiber. To increase the flexibility of the leatherette, the nonwoven fabric was preimpregnated in a polyvinyl alcohol (PVA) solution. The PVA-impregnated nonwoven seaisland type nylon microfiber was treated with a polyurethane (PU) solution and then the elution process was performed to remove PVA and co-PET using a NaOH solution. The morphologies of the nonwoven fabrics before and after elution of PVA and co-PET were observed by scanning electron microscopy (SEM). The pliability of the nonwoven fabric was evaluated using flexibility and stiffness tests before and after each treatment. The leatherette with the PVA-treated nonwoven fabric showed more pores and gaps in its morphologies and higher flexibility in the stiffness test. Finally, mechanical properties were analyzed based on tensile properties and dynamic modulus.
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Poly(lactic acid) 부직포의 수분 침지온도 및 처리시간에 따른 분해특성 연구
남택욱,전민홍,이승구,주창환 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.1
Polylactic acid (PLA), a biodegradable polymer, has been widely used for disposableapplications as a replacement for nondegradable polymers. The decomposition ofbiodegradable polymers is mainly carried out by composting, photolysis, and hydrolysisunder given environmental conditions. The purpose of this study is to investigate the effectof water treatment on the tensile and thermal properties of needle-punched PLA nonwovenfabrics. The PLA nonwoven fabric was immersed in water at various temperatures andtreatment times. The morphology and thermal and mechanical properties of the PLA nonwovenswere examined by scanning electron microscopy, differential scanning calorimetry,thermogravimetric analysis, and a tensile tester according to the water immersionconditions. The results showed that when the water treatment time increased, the tensilestrength and tear force of the PLA nonwoven fabric decreased significantly. Crystallinityanalysis showed that the decomposition of PLA nonwovens was due to molecular chaincleavage of the α and β phases. Depending on the decomposition environment, theweight reduction of PLA nonwovens by water treatment was very high, while the decreasein tensile strength was proportional to the weight reduction. Therefore, the decompositionof PLA during water treatment was confirmed to be very significant.
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