Characterization of an isotactic polystyrene/poly(2,6-dimethylphenylene oxide) nanorod blend with gradient composition and crystallinity

Wu, Hui; Su, Zhaohui; Takahara, Atsushi

doi:10.1039/c2ra21570e

Cited by 12 publications

(10 citation statements)

References 42 publications

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“…The formation of diverse patterns in polymer thin films is of considerable technological and scientific importance in coatings, adhesives, photoresists, electronics, biomaterials, and optical devices [ 1 – 5 ]. By thermal [ 2 , 6 ] or solvent [ 7 , 8 ] annealing, melt-wetting templates [ 9 , 10 ], and nanoimprint lithography [ 11 , 12 ], patterned surface with unique topography and properties can be constructed. For example, poly( ε -caprolactone) (PCL) film with hierarchical nanowire patterns fabricated by melt-wetting anodic aluminum oxide templates showed a higher capability of protein adsorption and better cell growth than that with smooth surface [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of Low‐Molecular‐Weight Poly(ethylene oxide)‐block‐polystyrene Diblock Copolymer Thin Film

Huang

2013

The Scientific World Journal

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The structural evolution of low-molecular-weight poly(ethylene oxide)-block-polystyrene (PEO-b-PS) diblock copolymer thin film with various initial film thicknesses on silicon substrate under thermal annealing was investigated by atomic force microscopy, optical microscopy, and contact angle measurement. At film thickness below half of the interlamellar spacing of the diblock copolymer (6.2 nm), the entire silicon is covered by a polymer brush with PEO blocks anchored on the Si substrate due to the substrate-induced effect. When the film is thicker than 6.2 nm, a dense polymer brush which is equal to half of an interlamellar layer was formed on the silicon, while the excess material dewet this layer to form droplets. The droplet surface was rich with PS block and the PEO block crystallized inside the bigger droplet to form spherulite.

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Section: Introductionmentioning

confidence: 99%

Structural Evolution of Low‐Molecular‐Weight Poly(ethylene oxide)‐block‐polystyrene Diblock Copolymer Thin Film

Huang

2013

The Scientific World Journal

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“…Therefore, nano porous AAO templates with self-organized hexagonal arrays of uniform parallel nanochannels have been intensively utilized as a popular template system for fabricating various functional polymer nanostructures. By infi ltrating the polymers into nanopores, unusual 1D nanoscale structures with novel morphology, [116][117][118][119][120][121] specifi c orientation, [122][123][124][125][126][127][128][129][130][131] reduced crystallinity, [130][131][132][133] enhanced mobility, [ 134 ] gradient distributed composition, [ 115,135,136 ] gradient distributed crystallites, [137][138][139] and high thermal conductivity [ 140 ] were produced in nanopores of AAO templates.…”

Section: Anodic Aluminum Oxide Template Techniquementioning

confidence: 99%

Ordered Organic Nanostructures Fabricated from Anodic Alumina Oxide Templates for Organic Bulk‐Heterojunction Photovoltaics

Yang

Cao

et al. 2014

Macro Chemistry & Physics

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Solution‐processable organic photovoltaics (OPVs) attract much attention due to their potential as low‐cost and lightweight sources of renewable energy. The power conversion efficiency (PCE) of state‐of‐the‐art OPVs based on bulk‐heterojunction and tandem structures can reach over 10.0%, resulting from the progress in new materials, device engineering, device physics, etc. In particular, the fabrication and controllability of solution‐processable organic active‐layer thin films play an important role in the performance of OPV devices. The anodic aluminum oxide (AAO) template method is a versatile and fascinating technique for fabricating ordered organic nanostructures with controlled properties. Here, a review is given on the solution‐based fabrication of ordered organic semiconductor nanostructures by AAO templates, as well as its application in OPVs.

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“…By using these wetting methods, many publications have reported that polymer behaviors in AAO templates, consist of the flow ability and its gradients, phase separation behaviors, transformation behaviors, and so on. Atsushi Takahara et al [16,17,18] studied flowing gradients by using various polymer blends in AAO templates. With the larger pore size of AAO, it promoted phase separation of polymer blends.…”

Section: Introductionmentioning

confidence: 99%

Replication of Mesoscale Pore One-dimensional Nanostructures: Surface-induced Phase Separation of Polystyrene/Poly(vinyl alcohol) (PS/PVA) Blends

2019

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Mesoscale pore one–dimensional (1D) nanostructures, or vertically aligned porous nanostructures (VAPNs), have attracted attention with their excellent hydrophobic properties, ultra−high surface area, and high friction coefficient, compared to conventional vertically aligned nanostructures (VANs). In this study, we investigate the replication of VAPNs produced by the thermal nanoimprint process using anodic aluminum oxide (AAO2) templates (100 nm diameter). Polystyrene/poly(vinyl alcohol) (PS1/PVA) blends, prepared by the advanced melt–mixing process with an ultra–high shear rate, are used to investigate the formation of porosity at the nanometer scale. The results reveal that domain size and mass ratios of PVA precursors in the PS matrix play a dominant role in the interfacial interaction behavior between PS1–PVA–AAO2, on the obtained morphologies of the imprinted nanostructures. With a PVA nanodomain precursor (PS1/PVA 90/10 wt%), the integration of PVA nanodroplets on the AAO2 wall due to the hydrogen bonding that induces the phase separation between PS1–PVA results in the formation of VAPNs after removal of the PVA segment. However, in the case of PVA microdomain precursors (PS1/PVA 70/30 wt%), the structure transformation behavior of PS1 is induced by the Rayleigh instability between PVA encapsulated around the PS1 surfaces, resulting in the PS1 nanocolumns transforming into nanopeapods composed of nanorods and nanospheres.

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Characterization of an isotactic polystyrene/poly(2,6-dimethylphenylene oxide) nanorod blend with gradient composition and crystallinity

Cited by 12 publications

References 42 publications

Structural Evolution of Low‐Molecular‐Weight Poly(ethylene oxide)‐block‐polystyrene Diblock Copolymer Thin Film

Structural Evolution of Low‐Molecular‐Weight Poly(ethylene oxide)‐block‐polystyrene Diblock Copolymer Thin Film

Ordered Organic Nanostructures Fabricated from Anodic Alumina Oxide Templates for Organic Bulk‐Heterojunction Photovoltaics

Replication of Mesoscale Pore One-dimensional Nanostructures: Surface-induced Phase Separation of Polystyrene/Poly(vinyl alcohol) (PS/PVA) Blends

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