Preparation and Morphological Characteristics of m-Aramid Fibrid Using a Non-solvent of Ethanol
Vol. 51, No. 3, pp. 114-121,
Jun. 2014
10.12772/TSE.2014.51.114
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Abstract
Fibrids are materials of a complex fibrous, film-like, or intermediate form. The diameter of the particles varies between 20–50 μm, and 100–10,000 μm. 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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