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ÔÚThurn-Albrecht, T., et al., Adv. Mater. (2000) 12, 787.£¨Nanoscopic templates from oriented block copolymer films£©ÎÄÕµÄ789Ò³£ºIt is clear from the results shown that, by a selective removal
of the PMMA, an ordered nanoporous material can
be produced if the surrounding PS matrix remains intact.
FESEM images of the surface of a film that was exposed to
25 J/cm2 deep UV radiation, placed in acetic acid, (a selective
solvent for PMMA) for 2 h and then rinsed in deionized
water, show an ordered array of circular holes, in
keeping with the electron microscopy and small-angle neutron
scattering (SANS) results.

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ÔÚAlbert, J. N. L. and T. H. Epps (2010). "Self-assembly of block copolymer thin films." Materials Today 13(6): 24-33.ÖеÄ30Ò³£ºIn one example, Xuan et al.70 compared ultrathin (< ½ ¡Á L0 thickness)
lamellar PS-b-PMMA films annealed with acetone (strongly PMMA
selective), chloroform (slightly PMMA selective), toluene (slightly PS
selective), and carbon disulfide (highly PS selective).

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