Nano-SiO 2 /UHMWPE/HDPE blend microporous membranes (NBMs) with different content of nano-SiO 2 particles were prepared via thermally induced phase separation process. Thermogravimetric analysis was used to investigation of the amount of nano-SiO 2 particles reserved in NBMs. This approach showed that about 59% of total content of nano-SiO 2 particles reserved in NBMs. The formation and development of the interface pores were studied by scanning electron microscopy. NBMs performance was characterized by a variety of metrics including thermal shrinkage, melting and crystallization behavior, porosity and pore diameter, and permeability. The results indicated that nano-SiO 2 particles served as nucleating agent increasing the crystalline of NBMs. The comprehensive properties of NBMs were optimum when the content of nano-SiO 2 particles was 1%. Compared with pure HDPE separators, NBMs exhibit higher porosity and lower thermal shrinkage due to its high crystalline and the enrichment of UHMWPE chains.
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