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Uniform and porous polyurea (PU) microspheres of large size, with the diameter between 400μm and 750μm, are prepared through interface polymerization by drop-wise addition of toluene diisocyanate (TDI) to an aqueous solution of ethylene diamine (EDA). TDI addition is done through a needle with pore size of 60μm or larger at constant rate associated with the needle pore size. Effects of the needle...
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