Author/Authors :
Xu، نويسنده , , Ting and Kim، نويسنده , , Ho-Cheol and DeRouchey، نويسنده , , Jason and Seney، نويسنده , , Chevey and Levesque، نويسنده , , Catherine and Martin، نويسنده , , Paul and Stafford، نويسنده , , C.M. and Russell، نويسنده , , T.P.، نويسنده ,
Abstract :
Asymmetric diblock copolymers of polystyrene (PS) and poly(methylmethacrylate) (PMMA), PS(S-b-MMA), having cylindrical microdomains of PMMA, are model systems to generate nanoporous thin films. With controlled interfacial interactions or applied external electric fields, the cylindrical microdomains can be oriented normal to the surface. Exposure to deep UV radiation degrades the PMMA and crosslinks the PS matrix. After rinsing with a selective solvent, a nanoporous film is obtained. By changing the molecular weight, smooth porous films with hexagonal arrays of pores having diameters ranging from 14 to 50 nm were obtained. The results show that molecular weight is a convenient, simple means of controlling pore diameter.
