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Poly (l-lactic acid) (PLLA) flat sheet membranes with inter-connected pores were prepared via non-solvent induced phase separation process. Polyethylene oxide (PEO) with molecule weight of 100kD was used as additives. The morphology evolution from the partial to total inter-connected pores in cross section was accomplished by adjusting the PEO concentration. Besides, the effect of different molecule...
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