【摘要】 采用热致相分离（ＴＩＰＳ）技术制备了聚氨酯（ＰＵ）多孔膜，研究了成膜平台温度对多孔膜表面形态、孔度大小、孔隙率和透湿率的影响，在不同成膜温度下制备的ＰＵ多孔膜的共同特征是底面（与成膜平台的接触面）光滑平整，孔洞的尺度均小于相应的表面（与空气的接触面），断面结均显示．ＰＵ多孔膜的内部疏松而多孔，孔之间相互连通，且存在较为规则的梯形条纹状（Ｌａｄｄｅｒ－ｌｉｋｅ）结构，以导热性较差的玻璃代替不锈钢成膜平台，在相同的条件下所得多孔膜的孔度、孔隙率和透湿率都明显增大，通过控制成膜温度、成膜平台材质等制备条件，可对ＰＵ多孔膜的形态结构、孔度大小、孔隙率和透湿率等性能进行剪裁．更多还原

【Abstract】 Thermally induced phase separation (TIPS) technique was employed to prepare porous polyurethane (PU) membranes. The influences of cold-plate temperature on the surface morphology, pore size, porosity and water vapor transmitting ratio of the porous PU membranes were studied. The bottom surfaces (the surfaces contacting with the membrane-forming platform) of the porous PU membranes are planar and smooth for all the selected temperature. The pore sizes are smaller than the opposite sides. The top surfaces, the free surfaces toward air, have larger pores than the corresponding bottom surfaces due to the longer coarsening time. Both the pore sizes on the surfaces and in the inner parts decrease along with the decreasing of the cold-plate temperature (increasing of the quenching rate). The structure of cross-sections show that the inner structure of the PU membranes obtained at all the temperature is highly porous and the pores are interconnected. When the glass of small heat-conducting was employed to replace the stainless steel as membrane-forming platform, a porous membrane with a larger pore size on both of the bottom and the top surfaces, higher porosity and water vapor transmitting ratio was produced. The porous PU membranes that have potential applications as scaffolds for tissue engineering can be fabricated by TIPS, and its morphology pore size, porosity and transmitting property can be controlled and tailored through variation of the quenching rate or membrane-forming platforms with different heat-conducting property.更多还原