TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Fiber modifying agent functions as a plasticizer that reduces the melt viscosity of the thermoplastic resin during polymer fiber formation and as a surface modifying agent that promotes the instantaneous and sustained wettability of the high porosity polymer fiber sheet. Fiber modifying agent is selected from di-butoxyethoxyethyl adipate, triethylene glycol 2-ethylhexanoate, triethylene glycol dibenzoate, dialkyl diether glutarate, and polymer of polyethylene glycol ester family, preferably polymer of polyethylene glycol ester family. Plasticizer is selected from di-n-butyl phthalate, diundecyl phthalate, di-2-ethylhexyl phthalate, n-hexyl laurate, di-2-ethylhexyl sebacate, di-2-ethylhexyl adipate, and di-2-ethylhexyl azelate. Surface modifying agent is selected from sodium dodecylbenzene sulfonate, sodium dibutyl naphthalene sulfonate, sodium diisopropyl naphthalene sulfonate, and sodium dioctyl sulfosuccinate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: Polymer fibers are formed from thermoplastic resin having melt viscosity. Polymer in polyethylene glycol ester family is polyethylene glycol-600 dilaurate or polyethylene glycol-400 di-2-ethylhexanoate. 9. Polymer fibers are fibers that are stable in sulfuric acid e.g. polyester, polystyrene, polyolefin, or polyacrylate. Matrix of polymer fibers has surface, and further contains silica-filled polyethylene separator that is bonded to surface of matrix of polymer fibers to form silica-filled separator polymer fiber sheet composite. Polymer fibers of the 1st matrix and polymer fibers of the 2nd matrix are formed from different polymers or the same polymers with different fiber diameters. Preferred Processes: Calendering process is performed to impart desired physical property to polymer fiber sheet. Sheet of polymer fibers is produced by extruding mixture to form melted extrudate and passing melted extrudate through die to form polymer fibers. Fiber modifying agent is mixed with polymer in melted state. Processing of mixture of polymer and fiber modifying agent involves electrospinning, melt fiber spinning, solution spinning, electroblowing, force spinning, or melt spinning by cold air attenuation, preferably force spinning.