Poly-m-phenylene isophthalamide(PMIA, m-aramid) is composed of aromatic rings and amide groups. This composition of rigid structure with the strong hydrogen bonding shows high thermal, mechanical, and chemical stability. They are used in aerospace and military applications, for ballistic rated body ...
Poly-m-phenylene isophthalamide(PMIA, m-aramid) is composed of aromatic rings and amide groups. This composition of rigid structure with the strong hydrogen bonding shows high thermal, mechanical, and chemical stability. They are used in aerospace and military applications, for ballistic rated body armor fabric and ballistic composites, in bicycle tires, electrical insulator, and as an asbestos substitute. m-Aramid papers were developed in the 1960s, which were composed of floc and fibrid. Floc is short cut fiber of m-aramid and fibrid is film-like fine fiber like pulp. Here, mechanical properties of m-aramid papers strongly depend on the properties of floc and fibrid, and the state of combination between floc and fibrid. In this experiment were prepared for the two types of fibrous m-aramid; one is fibrid by using the fibridator and the other is m-aramid ultra-fine fiber prepared by conventional wet-spinning method. The several kinds of fibrids were obtained by changing the processing conditions; solvent content in coagulating solution(20, 30, 40 wt%) and viscosity of m-aramid dope solution(8, 10, 12 wt%). At the low solvent content, the coagulation rate was fast and m-aramid dope was transformed in floc form. On the other hand, as the solvent of coagulation bath increased, the coagulation rate was slow and fibrids sticked together. The lower viscosity of m-aramid dope was effective on the proper fibrids morphology. m-Aramid fine fibers were obtained by removing poly(vinyl alcohol)(PVA) component from m-aramid/PVA composite fibers. The composite fibers were prepared using a mixture of m-aramid and PVA solutions by wet-spinning with methyl alcohol as a coagulation solvent. The ratios of m-aramid to PVA were 60/40, 70/30, 80/20 wt%. Phase separation in theses immiscible polymer solution blends led to m-aramid being extracted in a small sized fiber state. The diameter of the fine m-aramid fibers decreased as the PVA contents increased. The object of this study is to provide new method for preparing ultra-fine fiber structured m-aramid and to investigate the effect of investigate materials on the properties of the m-aramid paper.
Poly-m-phenylene isophthalamide(PMIA, m-aramid) is composed of aromatic rings and amide groups. This composition of rigid structure with the strong hydrogen bonding shows high thermal, mechanical, and chemical stability. They are used in aerospace and military applications, for ballistic rated body armor fabric and ballistic composites, in bicycle tires, electrical insulator, and as an asbestos substitute. m-Aramid papers were developed in the 1960s, which were composed of floc and fibrid. Floc is short cut fiber of m-aramid and fibrid is film-like fine fiber like pulp. Here, mechanical properties of m-aramid papers strongly depend on the properties of floc and fibrid, and the state of combination between floc and fibrid. In this experiment were prepared for the two types of fibrous m-aramid; one is fibrid by using the fibridator and the other is m-aramid ultra-fine fiber prepared by conventional wet-spinning method. The several kinds of fibrids were obtained by changing the processing conditions; solvent content in coagulating solution(20, 30, 40 wt%) and viscosity of m-aramid dope solution(8, 10, 12 wt%). At the low solvent content, the coagulation rate was fast and m-aramid dope was transformed in floc form. On the other hand, as the solvent of coagulation bath increased, the coagulation rate was slow and fibrids sticked together. The lower viscosity of m-aramid dope was effective on the proper fibrids morphology. m-Aramid fine fibers were obtained by removing poly(vinyl alcohol)(PVA) component from m-aramid/PVA composite fibers. The composite fibers were prepared using a mixture of m-aramid and PVA solutions by wet-spinning with methyl alcohol as a coagulation solvent. The ratios of m-aramid to PVA were 60/40, 70/30, 80/20 wt%. Phase separation in theses immiscible polymer solution blends led to m-aramid being extracted in a small sized fiber state. The diameter of the fine m-aramid fibers decreased as the PVA contents increased. The object of this study is to provide new method for preparing ultra-fine fiber structured m-aramid and to investigate the effect of investigate materials on the properties of the m-aramid paper.
주제어
#메타아라미드, 피브리드, m-aramid, meta-aramid, m-aramid fiber, m-aramid paper, fibrid, ultra-fine fiber, secondary battery, separator
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