【摘 要】
：
The self-assembly of block copolymers(BCPs)has attracted much attention both on experimental and theoretical investigations due to their ability to form periodic arrays of nanoscopic elements.1,2 BCPs
【机 构】
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State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chine
【出 处】
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The 11th International Symposium on Polymer Physics(PP2014)(
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The self-assembly of block copolymers(BCPs)has attracted much attention both on experimental and theoretical investigations due to their ability to form periodic arrays of nanoscopic elements.1,2 BCPs can spontaneously self-assemble into various ordered morphologies,sphere,cylinder,lamella,and gyroid,and so on.On the other hand,it was found that BCPs can form into some unusual morphologies within the pores of anodized aluminum oxide(AAO)because of the confined effect,providing opportunities to engineer novel structures.3 Recently,it was also found that solvent annealing is a powerful way to tune the self-assembled structure,which results in some well-ordered structures.4 In the current study,we first generated the various ordered nanorods utilizing the microphase separation of block copolymer confined in the nanopores of the AAO template.Subsequently,the solvent-annealing was used to tune the structures of the nanorods,which results in the morphological transition from ordered nanorods to ordered nanospheres.Figure 1 presents the self-assembled structures of three different PS-b-P4VP copolymers in confined AAO templates by wetting the AAO templates in copolymer solutions(5wt%in CHCl3)for 2-3 times.For the symmetric PS(9.8k)-b-P4VP(10k)block copolymer(Figure 1a),alternating bright(PS)and dark(P4VP)lines parallel to the nanorod axis are observed,with PS preferentially located at the interface with the pore wall.Figure 1b shows the morphology of the asymmetric PS(19k)-b-P4VP(5.2k)copolymer.The P4VP block form the toroidal-type structures ordered stacking in PS cylinder.For PS(15k)-b-P4VP(3.5k)copolymer with the shortest P4VP block,P4VP aggregate into a series of dots uniformly distributed in PS cylinder.From the self-assembled morphologies in Fig.1,it is clear that the block ratio of P4VP to PS and plays a key role in self-assembly confined in nanopores.
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