将两亲性 PS-b-PNIPAAm 嵌段共聚物(BCP)溶解在四氢呋喃中配制成浓度为2％(质量分数)的溶液，旋涂后得到初生嵌段共聚物薄膜，以乙醇为退火溶剂退火后，探讨了退火时间对薄膜微孔结构的影响，结果表明，随着退火时间的延长，膜表面的微相分离越明显，微孔结构的分布更均匀。进一步将在乙醇中退火预处理的薄膜分别在乙醇或去离子水中进行溶胀处理，通过选择性溶胀成孔法制备 PS-b-PNIPAAm纳米多孔膜。研究了溶胀时间、温度及溶剂类型对薄膜形貌的影响，结果发现升高溶胀温度和延长溶胀时间均有助于膜表面微孔结构的形成，且该过程中乙醇的成孔作用比水的作用更为明显。
The amphiphilic PS-b-PNIPAAm block copolymer(BCP)was dissolved in tetrahydrofuran to obtain 2wt% solution and the nascent BCP thin films were fabricated by spin-coating.Subsequently,the thin films were annealed in ethanol vapor with different time.The effect of annealing time on microstructure of thin films was discussed.The results indicated that the extension of annealing time resulted in the obvious micro-phase separation of film surface and uniformly distribution of micropores.The film annealed by ethanol was then swelled in pure water or ethanol,respectively.The nanoporous thin films were prepared by swelling-induced pore-making method.The effect caused by swelling time,swelling temperature and solvent on microstructure of thin films was discussed.It is found that the elevation of swelling temperature and increase of swelling time con-tributed to the formation of microporous structures.Also,the pore-forming ability of ethanol was stronger than that of water in the swelling process.
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