Abstract
Supramolecular assemblies (PS-b-P4VP (AzoR)) are fabricated by hydrogen-bonding azobenzene derivatives (AzoR) to poly(4-vinyl pyridine) blocks of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP). PS-b-P4VP(AzoR) forms phase separated nanostructures with a period of ∼75–105 nm. A second length scale structure with a period of 2 μm is fabricated on phase separated PS-b-P4VP(AzoR) by laser interference ablation. Both the concentration and the substituent of AzoR in PS-b-P4VP(AzoR) affect the laser ablation process. The laser ablation threshold of PS-b-P4VP(AzoR) decreases as the concentration of AzoR increases. In PS-b-P4VP(AzoR) with different substituents (R = CN, H, and CH3), ablation thresholds follow the trend: PS-b-P4VP(AzoCN)<PS-b-P4VP(AzoCH3)<PS-b-P4VP(AzoH). This result indicates that the electron donor group (CH3) and the electron acceptor group (CN) can lower the ablation threshold of PS-b-P4VP(AzoR).
Highlights
The interaction of high energy lasers with polymers can result in ablation of polymers at irradiated areas [1,2,3,4,5,6,7,8,9,10,11]
We previously reported that block copolymers (BCPs) can be hierarchically structured by combining phase separation with laser interference ablation [10]
We found that the ablation threshold of BCP supramolecular assemblies PS-b-P4VP(AzoR) decreases as the concentration of azobenzene derivatives (AzoR) increases
Summary
The interaction of high energy lasers with polymers can result in ablation of polymers at irradiated areas [1,2,3,4,5,6,7,8,9,10,11]. Laser ablation of polymers is extensively studied and shows many applications, studies on laser ablation of block copolymers (BCPs) are rare [9]. We previously reported that BCPs can be hierarchically structured by combining phase separation with laser interference ablation [10]. Shorter length scale structures of the hierarchical structures are phase separated nanostructures and longer length scale structures are interference patterns generated by laser ablation [10]. There is a lack of fundamental understanding of laser ablation of block copolymers. Understanding laser ablation of BCPs is helpful for the design of BCPs which can be effectively ablated and patterned. It is highly desirable to understand laser ablation of BCPs and decrease ablation thresholds of BCPs
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