In this study, for the first time, we succeeded in manufacturing a high molecular weight cellulose acetate (CA) for based battery separator, capable of controlling pores and improved thermal stability and mechanical strength without a support. The CA/1,2,3-trihydroxy-propane composite as film-type was prepared by a free-standing method using doctor blade. The composite was applied to hydraulic pressure from 2 to 8 bar. Due to 1,2,3-trihydroxy-propane, the plasticized area of the composite was pierced by high water-pressure to form channels. It was proved that the number and size of pores can be controlled by adjusting the water pressure. The pore size became varied from nano to micro-size and the average pore size was 224 nm with 84.6% of the porosity. While measuring the thermal decomposition temperature of the composite by TGA, it was observed that the composite with water pressure at 8 bar began to be thermally decomposed at about the same temperature as the neat CA film but decomposed more slowly. In addition, it was confirmed that the intermolecular interaction force between CA chains increased through FT-IR spectroscopy. Therefore, it can be deduced that the thermostability and mechanical strength were improved despite the formation of pores by applying water-pressure.

在这项研究中，我们首次成功地制造出用于基电池隔膜的高分子量醋酸纤维素 (CA)，能够在没有支撑的情况下控制孔隙并提高热稳定性和机械强度。CA/1,2,3-三羟基丙烷复合材料为薄膜型，采用刮刀自支撑法制备。将复合材料施加到 2 至 8 巴的液压。由于1,2,3-三羟基丙烷，复合材料的塑化区域被高水压刺穿形成通道。事实证明，可以通过调节水压来控制孔隙的数量和大小。孔径从纳米到微米不等，平均孔径为 224 nm，孔隙率为 84.6%。在通过 TGA 测量复合材料的热分解温度时，据观察，水压为 8 巴的复合材料在与纯 CA 膜大致相同的温度下开始热分解，但分解速度更慢。此外，通过FT-IR光谱证实CA链之间的分子间相互作用力增加。因此，可以推断，尽管通过施加水压形成了孔隙，但热稳定性和机械强度得到了提高。