超临界流体制备微发泡聚合物材料的研究进展

以超临界流体为物理发泡剂制备的微发泡聚合物材料具有小的泡孔尺寸和高的泡孔密度,从而赋予材料优异的性能.本文首先阐述了微发泡聚合物材料的制备原理,以及聚合物微发泡过程中泡孔形成的四个阶段;基于这些认识,针对微发泡聚合物材料泡孔形态的改善,即增加泡孔密度、减小泡孔尺寸以及均化泡孔尺寸分布,从加强泡孔成核、控制泡孔增长的角度综述了近年来的研究进展;最后对如何有效控制泡孔形态提出了建议,并对微发泡聚合物材料的应用前景进行了展望.

Research Progresses in Preparation of Microcellular Polymers by Supercritical Fluid Technique

Microcellular polymers prepared by using supercritical fluid as physical blow agent have fine cell size and high cell density, therefore exhibit excellent properties. This paper has described four steps in the formation of cells during microcellular foaming process. Subsequently, the recent progress in the preparation of microcellular polymers is reviewed from the angles of cell nucleation and cell growth to reach improved cell morphology, including increased cell density, decreased cell size and uniformize...