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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.
합성고무와 카르복시메틸셀룰로오스(CMC) 나트륨을 이용한 하이드로콜로이드형 창상치료재의 제조 및 평가
김원일(Won Il Kim),이승욱(Seung Wook Lee),박재진(Jae Jin Park),고영광(Young-Gwang Ko),박원호(Won Ho Park),조동환(Donghwan Cho),권오형(Oh Hyeong Kwon) 한국고분자학회 2016 폴리머 Vol.40 No.1
본 연구에서는 합성고무와 sodium carboxymethylcellulose(CMC)를 서로 다른 조성비로 혼합하여 하이드로콜 로이드형 창상치료재를 제조하였다. 얻어진 창상치료재는 CMC 함량이 높아질수록 신장률과 점착력은 감소하는 경향을 나타내는 반면에 흡수도는 높아지는 것을 확인할 수 있었다. 최적의 조성으로 판단된 40%의 CMC를 함유하는 하이드로콜로이드의 신장률, 점착력, 흡수도 및 투습도는 각각 400% 이상, 1.78 kgf/25 mm, 327% 및 547 g/㎡/day임을 확인하였다. 제조된 하이드로콜로이드의 세포배양실험 결과 세포적합성이 우수하였고, 동물실험 결과 대조군에 비하여 우수한 창상치유 효과를 보였으며, 피부자극성시험 결과 자극이 없는 것으로 나타났다. 따라서 본 연구에서 제조한 하이드로콜로이드는 의료용 창상치료재로서의 적용 가능성이 높음을 알 수 있었다. In this study, hydrocolloid wound dressing was fabricated from synthetic rubbers and sodium carboxymethylcellulose (CMC) with different composition ratios. Hydrocolloid wound dressing fabricated in this study showed increased absorptivity, decreased elongation at break and adhesive forces with increasing content of CMC. Hydrocolloid with 40% of CMC is determined as the optimum composition and its elongation at break, adhesive force, water absorptivity and moisture vapor transmission rate were more than 400%, 1.78 kgf/25 mm, 327% and 547 g/㎡/day, respectively. Fabricated hydrocolloid was found to have the best property on the in vitro cell culture test, and in vivo animal study showed excellent wound healing effect than control groups. Also there was no stimulation in the skin irritation test. Therefore, it is confirmed that hydrocolloid has the broad application possibility as wound healing materials.