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中文摘要：
以超高分子量聚乙烯作为原料,在超临界二氧化碳中通过热处理成功制备了聚合物微米球.微球尺寸符合高斯分布,并可以控制在较窄范围内,微球表面多孔且内部中空.微球的形成是恒温过程和超临界二氧化碳双重作用的结果.降温过程导致聚合物溶解度降低,超高分子量聚乙烯分子链析出结晶而形成微球,内部包裹了少量二氧化碳;温度进一步降低导致微球内外压力不平衡,二氧化碳从空心球内部释放形成表面孔洞.恒温结晶过程除了促使微球结晶度进一步提高外,还可以使亚稳晶型单斜晶转化为稳定的正交晶.
英文摘要：
The hollow microspheres were prepared from ultrahigh molecular weight polyethylene（UHMWPE） in supercritical CO2 fluid.The sphere size is Gaussian distribution,and can be controlled at a narrow range.There are pores on the surface of hollow microspheres due to the CO2 gas releasing from confined location in the microsphere with decreasing the temperature of supercritical fluid.The crystallinity increases and monoclinic crystals can be generated for prepared UHMWPE microspheres in supercritical CO2 fluid.The isothermal crystallization process can increase both the crystallinity and the content of orthorhombic crystals of UHMWPE.
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