• Title/Summary/Keyword: fiber materials

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Investigation of Co-poly-para-aramid Fiber Dispersion in Chloroprene Rubber Matrix and Improvement of Dispersibility Through Fiber Surface Modification

  • Garam Park;Hyeri Kim;Gayeon Jeong;Dohyeong Kim;Seungchan Noh;Dajeong Gwon;Myung Chan Choi;Jaseung Koo
    • Elastomers and Composites
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    • v.57 no.4
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    • pp.175-180
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    • 2022

  • To produce a co-poly-para-aramid fiber (AF, Technora®)-reinforced neoprene rubber composite, dispersion of AF in a neoprene matrix is investigated. The AF is then surface-modified by mercerization and acetone, plasma, and silane treatments to improve dispersibility. Finally, an internal mixer process is used to disperse the surface-modified fibers in the neoprene rubber matrix.

  • https://doi.org/10.7473/EC.2022.57.4.175 인용 PDF KSCI

Characterization of SiC Fiber Derived from Polycarbosilanes with Controlled Molecular Weight (분자량이 조절된 폴리카보실란으로부터 제조한 SiC Fiber의 특성분석)

  • Shin, Dong-Geun;Riu, Doh-Hyung;Kim, Younghee;Kim, Hyung-Rae;Park, Hong-Sik;Kim, Hyoun-Ee
    • Journal of the Korean Ceramic Society
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    • v.42 no.8 s.279
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    • pp.593-598
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    • 2005

  • Polycarbosilane was synthesized by the Kumada rearrangement of polydimethylsilane in the presence of zeolite (ZSM-5) as a catalyst at $350^{\circ}C$. The prepared polycarbosilane had very low molecular weight ($M_w=500$), so that it was not suitable to fabricate SiC fiber by melt spinning. Further polymerization of PCS was conducted around $400^{\circ}C$ to obtain spinnable polycarbosilane. After polymerization, the polycarbosilanes were isolated by distillation according to the molecular weight distributions. The PCS with a controlled molecular weight distribution was spun into continuous polycarbosilane green fibers. The PCS green fiber was successfully transformed into silicon oxycarbide fiber. The room temperature strength of the SiC fiber was around 1.5 - 1.8 GPa. The oxidation behavior and the tensile strength after oxidation were also evaluated.

  • https://doi.org/10.4191/KCERS.2005.42.8.593 인용 PDF KSCI