POLYMERIC MATERIALS FORMED BY PRECIPITATION WITH A COMPRESSED FLUID ANTISOLVENT
POLYMERIC MATERIALS FORMED BY PRECIPITATION WITH A COMPRESSED FLUID ANTISOLVENT
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DOI：
10.1002/aic.690390113
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发表时间：
1993-01-01
期刊：
影响因子：
3.7
通讯作者：
BODMEIER, RA
中科院分区：
文献类型：
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作者：
DIXON, DJ;JOHNSTON, KP;BODMEIER, RA
聚合物微球和纤维是用一种多功能的新工艺形成的，即用压缩流体抗溶剂沉淀。通过喷涂Iwt. %的聚苯乙烯甲苯溶液通过100 μ m喷嘴注入CO2中，当CO2密度从0.86降至0.13 g/cm 3时，形成直径为0.1至20 μ m的微球。在高CO2密度下产生的均匀亚微米球部分是由于大惯性和低界面力产生的快速雾化。在较高的聚合物浓度下获得具有和不具有微孔性的纤维，其中粘性力使射流稳定。CO2密度和温度对所得聚合物材料的尺寸、形态和孔隙率的影响从相行为、喷雾特性和玻璃化转变温度的降低方面进行了解释。
Polymer microspheres and fibers are formed with a versatile new process, precipitation with a compressed fluid antisolvent. By spraying a 1 wt. % polystyrene in toluene solution into CO2 through a 100-mum nozzle, microspheres are formed with diameters from 0.1 to 20 mum as the CO2 density decreases from 0.86 to 0.13 g/cm3. The uniform submicron spheres produced at high CO2 density are due in part to the rapid atomization produced by the large inertial and low interfacial forces. Fibers, with and without microporosity, are obtained at higher polymer concentrations where viscous forces stabilize the jet. The effect of CO2 density and temperature on the size, morphology and porosity of the resulting polymeric materials is explained in terms of the phase behavior, spray characteristics, and the depression in the glass transition temperature.