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아웃도어용 바이오 폴리우레탄-ePTFE 멤브레인 직물의 영하 20도에서 특성 연구
서대경,이장훈,홍재근,권오경,김효정,Seo, Dae-kyung,Lee, Jang-hun,Hong, Jae-guen,Kweon, Oh-kyung,Kim, Hyo-jung 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.4
This paper intends to study the characteristics of hybrid film fabrics composed of a $5-20{\mu}m$ bio-polyurethane layer and an ePTFE layer in low-temperature conditions. Bio-polyurethane resin was coated on the ePTFE fabric using direct coating methods. The water pressure properties increased with increasing polyurethane layer thickness, while water vapor permeability decreased. In comparison with ePTFE laminated fabric, hybrid film laminated fabrics are effective in enhancing mechanical properties (tensile strength, tear strength) and heat retention. In addition, the decrease in overall properties with respect to the flex resistance under low temperature was offset by the coated bio-polyurethane layer.
랜덤상태의 E-유리 단섬유 강화 불포화 폴리에스터 기반 수지 복합재료의 물성 - E-유리 단섬유의 길이와 함량 및 적층수의 영향 -
박진명,박영광,이영희,서대경,이장훈,김한도,Park, Jin-Myung,Park, Young-Gwang,Lee, Young-Hee,Seo, Dae-Kyung,Lee, Jang-Hun,Kim, Han-Do 한국염색가공학회 2015 韓國染色加工學會誌 Vol.27 No.3
To develop automobile parts, the unsaturated polyester based matrix resin(PR)/reinforcement(randomly oriented chopped E-glass fiber, GF) composites were prepared using sheet molding compound(SMC) compression molding. The effects of GF length(0.5, 1.0 1.5 and 2.0inch)/content (15, 20, 25, 30wt%) and number of ply(3, 4 and 5) on the specific gravity and mechanical properties of PR/GF composites were investigated in this study. The optimum length of GF was found to be about 1.0inch for achieving improved mechanical properties(tensile strength and initial modulus). The tensile strength and initial modulus of composites increased with increasing GF content up to 30wt%, which is favorable content range for SMC. The specific gravity, tensile strength/initial modulus, compressive strength/modulus, flexural strength/modulus and shear strength increased with increasing the number of ply up to 5, which is the maximum number of ply range for SMC. The effectiveness of ply number increased in the flexural strength > shear strength > compressive strength > tensile strength.