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에탄올 비용매를 이용한 메타아라미드 피브리드 제조 및 형태학적 특성
백병운,김완진,정용식,Baek, Byungwoon,Kim, Wan Jin,Chung, Yong Sik 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.3
Fibrids are materials of a complex fibrous, film-like, or intermediate form. The diameter of the particles varies between $20-50{\mu}m$, and $100-10,000{\mu}m$. The optimal form and size of the particles depends in each case on the area of application. The fibrid form is the result of two processes, viz. a wave process and diffusion. The life span and break-up pattern of the polymer depend on the interphase surface tension, the viscosity of the polymer, and the diffusion speed ratio of the polymer and medium. In this study, m-aramid was polymerized at low temperature and in solution with an equal molar ratio of MPD and IPC in DMAc. The meta-aramid solution was prepared by dissolution in DMAc, and ethanol was used as a coagulation bath. The rotation speed was the main factor affecting the formation and morphology of the fibrid. Meta-aramid paper was produced from m-aramid fiber with meta-aramid fibrid by wet laying. The results showed that fibrid particle sizes decreased with increasing rotation speeds and decreasing concentrations of m-aramid in the solution. The properties of the m-aramid fibrid as a function of the processing conditions were investigated using an image analyzer, optical microscopy, and SEM. The resulting meta-aramid paper was analyzed in terms of its morphology, thickness, air permeability, and mechanical properties.
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고속회전 피브리데이터를 이용한 메타아라미드 피브리드 제조 및 형태학적 특성
김완진,이현영,백병운,정용식,Kim, Wan Jin,Lee, Hyeon Yeong,Baek, Byungwoon,Chung, Yong Sik 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.1
Fibrid is a material with complex, fibrous, film-like, and intermediate forms. The diameters of the particles vary from $20-50{\mu}m$ and $100-10,000{\mu}m$. The optimal form and size of the particles depend on the area of application. The form of fibrid is the result of two processes, a wave process and diffusion. The life span and break-up pattern of the polymer depend on the interphase surface tension, viscosity of the polymer, and speed ratio of the polymer to the medium. In this study, fibrids were produced using a fibridator with high-speed shearing force. Several kinds of fibrids were obtained by changing the processing conditions, including solvent content (20, 30, and 40 wt%) in the coagulating solution, viscosity of the m-aramid dope solution (8, 10, and 12 wt%), and rotor speed of the fibridator (2000, 4000, and 6000 rpm). With low solvent content, m-aramid dope was rapidly transformed into the floc form because the coagulation rate was fast. However, as the solvent in the coagulation bath increased, the coagulation rate slowed, and the fibrids stuck together. Lower m-aramid dope viscosity and faster rotor speed were effective in obtaining proper fibrid morphology because of weakened interaction between the polymer chains.
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