聚乳酸体型开孔发泡材料的制备

Preparation of Open and Skinless Polylactic Acid Foam

利用超临界二氧化碳(CO_2)发泡技术制备皮层开孔的聚合物发泡材料一直是个难题。本文创新性地选择超临界CO_2发泡技术和水滴模板法技术相结合,成功制备出皮层和内部均开孔的聚乳酸(PLA)体型开孔材料。实验结果表明,利用超临界CO_2发泡技术可以制备聚乳酸开孔发泡材料,通过改变发泡温度可实现内部孔径从8μm到32μm之间的调控。另一方面,利用水滴模板法技术可以进一步在聚乳酸发泡材料皮层形成开孔结构,通过简单的改变混合溶剂中氯仿和甲醇体积比,可以实现皮层孔径从2μm到6μm范围的调控。

To produce open and skinless polymer foams by using carbon dioxide （CO2） foaming technology is a puzzle. In this work, CO2 foaming technology and breath figures method were combined to prepare open and skinless polymer foams. The cell size in the range of 8-32 μm in core zone of the foams could be adjusted by changing foaming temperature. On the other hand, porous structures on skin layer of foams were obtained by breath figures method. Moreover, by simply changing the volume ratio of chloroform and methanol, the porous size on skin layer could be altered from 2 μm to 6 μm.